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On the Multi-q Characteristics of Magnetic Ground States of Honeycomb Cobalt Oxides

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Chinese physics Letters 2025年第2期42卷 98-108页

作者： Yuchen Gu Xianghong Jin Yuan Li International center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China Beijing National Laboratory for condensed matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

The Kitaev honeycomb model has received significant attention due to its exactly solvable quantum spin liquid ground states and fractionalized *** cobalt oxides have been considered as a promising platform for realizing this ***,in contrast to the conventional wisdom regarding the single-q zigzag magnetic order inferred from previous studies of the candidate materials Na_(2)IrO_(3) and α-RuCl_(3),recent experiments on two representative honeycomb cobalt oxides,hexagonal Na_(2)Co_(2)TeO_(6) and monoclinic Na_(3)Co_(2)SbO_(6),have uncovered evidence for more complex multi-q zigzag order *** review surveys the experimental strategies used to distinguish between single-and multi-q orders,along with the crystallographic symmetries of cobalt oxides,in comparison with previously studied *** general formation mechanism of multi-q order is also briefly *** goal is to provide a solid ground for examining the relevance of multi-q order in honeycomb cobalt oxides and discuss its implications for the microscopic model of these intriguing quantum magnets.

关键词： cobalt oxides quantum

Preformed Cooper pairs in a triclinic iron pnictide superconductor

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Science China(physics,Mechanics & Astronomy) 2025年第04期Mechanics & Astronomy) .卷 202-214页

作者： Zezhong Li Wenshan Hong Honglin Zhou Xiaoyan Ma Uwe Stuhr Kaiyue Zeng Long Ma Ying Xiang Huan Yang Hai-Hu Wen Jiangping Hu Shiliang Li Huiqian Luo Beijing National Laboratory for condensed matter physics Institute of Physics Chinese Academy of Sciences University of Chinese Academy of Sciences International center for Quantum Materials School of Physics Peking University Laboratory for Neutron Scattering and Imaging Paul Scherrer Institute Anhui Province Key Laboratory of condensed matter physics at Extreme Conditions High Magnetic Field LaboratoryChinese Academy of Sciences National Laboratory of Solid State Microstructures and Department of physics Collaborative Innovation Center of Advanced MicrostructuresNanjing University Songshan Lake Materials Laboratory

Electron pairing along with phase coherence generates superconductivity below the critical temperature （Tc）.In underdoped highTccuprates,these two quantum phenomena may occur at separate temperatures,which was lately confirmed in the quasi-twodimensional （quasi-2D） iron chalcogenide ***,we report a systematic investigation on the pre-pairing behavior in a triclinic iron pnictide superconductor (Ca0.85La0.15)10（Pt3As8）(Fe2As2)5with Tc≈30 K,where the superconductivity is quasi-2D manifested by the Berezinskii-Kosterlitz-Thouless *** neutron scattering experiments unambiguously reveal a spin resonance peak around ER=13 me V in the superconducting state,but its intensity continuously decreases when warming up across Tc,accompanied with an anomaly around T*≈45 K in spin correlations,and a suppression by an in-plane magnetic field persisting to the same *** T*,a significant Nernst signal and a reduction of density of states at the Fermi level are also *** results suggest that the precursor of spin resonance is highly related to the preformed Cooper pairs driven by phase fluctuations,much like the pseudogap case in cuprates.

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Modulation of the octahedral structure and potential superconductivity of La_(3)Ni_(2)O_(7)through strain engineering

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Science China(physics,Mechanics & Astronomy) 2025年第3期68卷 145-152页

作者： Zihao Huo Zhihui Luo Peng Zhang Aiqin Yang Zhengtao Liu Xiangru Tao Zihan Zhang Shumin Guo Qiwen Jiang Wenxuan Chen Dao-Xin Yao Defang Duan Tian Cui Key Laboratory of Material Simulation Methods&Software of Ministry of Education State Key Laboratory of Superhard MaterialsCollege of PhysicsJilin UniversityChangchun130012China center for Neutron Science and Technology Guangdong Provincial Key Laboratory of Magnetoelectric Physics and DevicesState Key Laboratory of Optoelectronic Materials and TechnologiesSchool of PhysicsSun Yat-sen UniversityGuangzhou510275China MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of condensed matter Shaanxi Province Key Laboratory of Advanced Functional Materials and Mesoscopic PhysicsSchool of PhysicsXi’an Jiaotong UniversityXi’an710049China institute of High Pressure physics School of Physical Science and TechnologyNingbo UniversityNingbo315211China

The recent transport measurements of La_(3)Ni_(2)O_(7)uncovered a“right-triangle”shape of the superconducting dome in the pressure-temperature(P-T)phase *** by this,we perform theoretical first-principles studies of La_(3)Ni_(2)O_(7)with the pressure ranging from 0 to 100 ***,we reveal a pressure dependence of the Ni-d_(z^(2))electron density at the Fermi energy(n_(z)^(E_(F)))that highly coincides with such *** this basis,we further explore the electronic structure under uniaxial *** tracking the stress response of n_(z)^(E_(F)),we propose that superconductivity can be achieved by applying only ~2GPa of compression along the c *** idea is further exemplified from the perspectives of lattice distortion,band structure,Fermi surface and superconducting phase *** also discuss the possible charge modulation under the stress and provide an insight into the relation between nz E Fand the superconducting T_(c)in La_(3)Ni_(2)O_(7)*** study provides new routes to the search of high-T_(c)superconductors in future experiments.

关键词： nickelate superconductors density functional theory strong correlated systems strain engineering

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Pressure induced superconducting dome in LaNiGa_(2)

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Science China(physics,Mechanics & Astronomy) 2025年第2期68卷 161-166页

作者： Yanan Zhang Dajun Su Zhaoyang Shan Yunshu Shi Rui Li Jinyu Wu Zihan Yang Kaixin Ye Fei Zhang Yanchun Li Xiaodong Li Chao Cao Valentin Taufour Lin Jiao Michael Smidman Huiqiu Yuan center for Correlated matter and School of physics Zhejiang UniversityHangzhou 310058China Department of physics and Astronomy University of CaliforniaDavis 95616USA Beijing Synchrotron Radiation Facility institute of High Energy physics Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Silicon and Advanced Semiconductor Materials Zhejiang UniversityHangzhou 310058China Collaborative Innovation center of Advanced Microstructures Nanjing 210093China

LaNiGa_(2)is a time-reversal symmetry breaking superconductor with symmetry protected band crossings,making it an ideal platform for investigating the interplay between unconventional superconductivity and electronic structure *** we present a transport study of LaNiGa_(2)under *** application of pressure to LaNiGa_(2)induces a significant enhancement of the superconducting transition temperature Tcat a pressure of 7 *** contrast,powder X-ray diffraction(XRD)results show no evidence of structural phase transitions up to 26.3 ***,the ratio of band diffusivity shows a sudden increase at around 7 GPa,suggesting possible pressure-induced changes in the electronic structure that are closely linked to the evolution of superconductivity.

关键词： high pressure superconductivity time-reversal breaking

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Edge supercurrent in Josephson junctions based on topological materials

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Science China(physics,Mechanics & Astronomy) 2025年第2期68卷 1-12页

作者： Junjie Qi Chui-Zhen Chen Juntao Song Jie Liu Ke He Qing-Feng Sun X.C.Xie Beijing Academy of Quantum Information Sciences Beijing 100193China School of Physical Science and Technology Soochow UniversitySuzhou 215006China institute for Advanced Study Soochow UniversitySuzhou 215006China College of physics and Hebei Advanced Thin Films Laboratory Hebei Normal UniversityShijiazhuang 050024China School of physics Xi’an Jiaotong UniversityMinistry of Education Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed MatterXi’an 710049China State Key Laboratory of Low Dimensional Quantum physics Department of PhysicsTsinghua UniversityBeijing 100084China Frontier Science center for Quantum Information Beijing 100084China Hefei National Laboratory Hefei 230088China International center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China Interdisciplinary center for Theoretical physics and Information Sciences Fudan UniversityShanghai 200433China

The interplay between novel topological states and superconductivity has garnered substantial interest due to its potential for topological quantum *** Josephson effect serves as a useful probe for edge superconductivity in these hybrid topological *** Josephson junctions based on topological materials,supercurrents exhibit unique quantum interference patterns,including the conventional Fraunhofer oscillations,theΦ_(0)-periodic oscillation,and the 2Φ_(0)-periodic oscillation in response to the external magnetic field(Φ_(0)=h/2e is the flux quantum,h the Planck constant,and e the electron charge).These interference patterns stem from varied Andreev reflection mechanisms and the associated current density *** review seeks to comprehensively examine the theoretical and experimental advancements in understanding the quantum interference patterns of edge supercurrents in Josephson junctions based on quantum spin Hall,quantum Hall,and quantum anomalous Hall systems.

关键词： quantum Hall effect quantum spin Hall effect quantum anomalous Hall effect Josephson junction edge supercurrent Andreev reflection

Antiferromagnetic Order and Possible Quantum Spin Liquid in Kagome Antiferromagnet LuCu_(3)(OH)_(6)Br_(2)[Br_(x)(OH)_(1-x)]

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Chinese physics Letters 2025年第2期42卷 255-259页

作者： Zezhong Li Lankun Han Yili Sun Shanshan Zhang Zhenyuan Zeng Shiliang Li Beijing National Laboratory for condensed matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China

Recent studies on the kagome lattice YCu_(3)(OH)_(6+x)X_(3-x)(X=Cl,Br)have provided promising evidence for the existence of Dirac quantum spin *** this study,we synthesized a new compound,LuCu_(3)(OH)_(6)Br_(2)[Br_(x)(OH)_(1-x)],which has two types of structures with two different space groups,P3m1 and *** type-Ⅰ sample with a space group of P3m1 had undistorted Cu^(2+)kagome planes and orders magnetically below approximately 1.5 *** type-Ⅱ sample had a larger unit cell with a space group of R3 and distorted kagome *** magnetic ordering was observed,and the low-temperature specific heat behaved like a Dirac quantum spin liquid,including a quadratic temperature dependence at zero field and an additional linear𝑇term under magnetic *** comparing the structures with those of YCu_(3)(OH)_(6+x)X_(3-x)(X=Cl,Br),we show that the quantum spin liquid ground state may have a deep connection with the𝐽J■-J-J′Heisenberg model in the kagome lattice.

关键词： distorted x) quantum

Revealing Light-Induced Charge Density Wave Melting and Carrier Redistribution in 1T-TiSe_2

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Chinese physics Letters 2025年第1期42卷 123-133页

作者： Wanying Chen Haoyuan Zhong Changhua Bao Fei Wang Xuanxi Cai Chenxia Yun Hao Teng Zhiyi Wei Shuyun Zhou State Key Laboratory of Low-Dimensional Quantum physics and Department of physics Tsinghua UniversityBeijing 100084China Beijing National Laboratory for condensed matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Frontier Science center for Quantum Information Beijing 100084China

Capturing ultrafast dynamics over a large momentum space is critical for revealing the relationship between the electronic and structural modulations in quantum ***,by performing time-and angle-resolved photoemission spectroscopy measurements at the Synergetic Extreme Condition User Facility(SECUF)equipped with an extreme ultraviolet light source,we reveal the ultrafast dynamics of a charge-density wave(CDW)material,1T-TiSe_(2),upon ***-induced CDW melting is revealed from two aspects:gap closing of the CDW at the Brillouin zone(BZ)center and weakening of the CDW folded band at the BZ *** comparing the transient electronic structure and spectral weight over a large momentum space,we further reveal the carrier redistribution involving the excitation of electrons from theГpoint to the M *** study provides a comprehensive picture of the physics and ultrafast dynamics of a CDW material across the entire BZ.

关键词： momentum equipped distribution

Topological origin of non-Hermitian skin effect in higher dimensions and uniform spectra

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Science Bulletin 2025年第1期70卷 51-57页

作者： Haiping Hu Beijing National Laboratory for condensed matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China

The non-Hermitian skin effect is an iconic phenomenon characterized by the aggregation of eigenstates near the system boundaries in non-Hermitian *** extensively studied in one dimension,understanding the skin effect and extending the non-Bloch band theory to higher dimensions encounter a formidable challenge,primarily due to infinite lattice geometries or open boundary *** work adopts a point-gap perspective and unveils that non-Hermitian skin effect in all spatial dimensions originates from point *** introduce the concept of uniform spectra and reveal that regardless of lattice geometry,their energy spectra are universally given by the uniform spectra,even though their manifestations of skin modes may *** on the uniform spectra,we demonstrate how to account for the skin effect with generic lattice cuts and establish the connections of skin modes across different geometric shapes via momentum-basis *** findings highlight the pivotal roles point gaps play,offering a unified understanding of the topological origin of non–Hermitian skin effect in all dimensions.

关键词： Non-Hermitian skin effect Uniform spectra Point gap Band theory

Great influence of demagnetization history on internal interaction and magnetization process of mischmetal-based magnets

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Science China(physics,Mechanics & Astronomy) 2025年第2期68卷 183-192页

作者： Dan Liu Jiefu Xiong Lichen Wang Xinqi Zheng Xin Ming Jiaying Jin Jiazheng Hao He Bai Zhenxing Li Tongyun Zhao Fengxia Hu Jirong Sun Jun Shen Baogen Shen Department of physics Beijing Technology and Business UniversityBeijing 10048China Ningbo institute of Materials Technology&Engineering Chinese Academy of SciencesNingbo 31521China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China Spallation Neutron Source Science center Dongguan 523803China School of Mechanical Engineering Beijing Institute of Technology Beijing 100081China Beijing National Laboratory for condensed matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 101408China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341000China

The magnetization process and corresponding magnetization curve are usually used to analyze the coercivity mechanism of NdFe-B based sintered ***,different demagnetization histories will seriously influence the magnetization curve,leading to an inaccurate understanding and analysis of magnetization *** this work,we investigated the magnetization behavior of multi-main phase(MMP)magnets with thermal demagnetized and alternating current demagnetized *** curves of initial magnetization process and demagnetization process of thermal demagnetized magnets reflect the movement of domain walls inside the grains and the magnetization interaction between the grains,*** is noted that the former process cannot represent the magnetization reversal of the entire magnet,which is not appropriate to analyze coercivity mechanism *** the recoil curves of both two processes of AC demagnetized magnets can illustrate the magnetization reversal of the entire grains and the interaction between ***-optical Kerr microscope shows that the grains of thermal demagnetized magnets are in multi-domain states,and the grains of AC demagnetized magnets are almost in singledomain *** walls of thermal demagnetized magnets move easily within the grains,which is more conducive to magnetization saturation in industrial *** addition,the minorloops of thermal demagnetized magnets can independently represent the transition of grains from multi-domain to single-domain and the demagnetization of single-domain grains,which is equivalent to characterizing the internal interactions by recoil *** investigation of magnetization characteristics of MMP sintered magnets starting from different demagnetized states is helpful to further understand the internal interaction and magnetic hardening mechanism.

关键词： permanent magnet demagnetization history magnetization reversal misch-metal rare earth