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A novel rapid cooling assembly design in a high-pressure cubic pres. apparatus

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Matter and Radiation at Extremes 2024年第2期9卷 98-104页

作者： Peiyan Wu Yongjiang Xu Yanhao Lin center for high pressure Science and Technology Advanced res.arch Beijing 100193People’s Republic of China School of Earth Sciences and res.urces China University of GeosciencesBeijing 100083People’s Republic of China

In traditional high-pressure–temperature assembly design, priority has been given to temperature insulation and retention at high *** limits the efficiency of cooling of samples at the end of experiments, with a negative impact on many studies in high-pressure Earth andplanetary science. Inefficient cooling of experiments containing molten phases at high temperature leads to the formation of quench textures.which makes it impossible to quantify key compositional parameters of the original molten phase, such as their volatile contents. Here,we pres.nt a new low-cost experimental assembly for rapid cooling in a six-anvil cubic pres.. This assembly not only retains high heatingefficiency and thermal insulation, but also enables a very high cooling rate (∼600 ℃/s from 1900 ℃ to the glass transition temperature).Without using expensive materials or external modification of the pres., the cooling rate in an assembly (∼600 ℃/s) with cube lengths of38.5 mm is about ten times faster than that in the traditional assembly (∼60 ℃/s). Experiments yielding inhomogeneous quenched melttextures.when the traditional assembly is used are shown to yield homogeneous silicate glass without quench textures.when the rapid coolingassembly is used.

关键词： cubic insulation apparatus

Anomalous bond lengthening in compres.ed magnetic doped semiconductor Ba(Zn_(0.95)Mn_(0.05))_(2)As_(2)

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Journal of Semiconductors 2024年第4期45卷 36-41页

作者： Fei Sun Yi Peng Guoqiang Zhao Xiancheng Wang Zheng Deng Changqing Jin Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Physics University of Chinese Academy of SciencesBeijing 101408China center for high pressure Science and Technology Advanced res.arch Beijing 100094Chin

Applying pressure has been evidenced as an effective method to control the properties of semiconductors,owing to its capability to modify the band configuration around Fermi ***,structural evolutions under external pres.sures.are required to analyze the *** high-pressure structure of a magnetic doped semiconductor Ba(Zn_(0.95)Mn_(0.05))_(2)As_(2)is studied with combination of in-situ synchrotron X-ray diffractions and diamond anvil *** materials become ferromagnetic with Curie temperature of 105 K after further 20%K *** title material undergoes an isostruc-tural phase transition at around 19 *** the transition pressure,it is remarkable to find lengthening of Zn/Mn-As bond within Zn/MnAs layers,since chemical bonds are generally shortened with applying *** with the bond stretch,interlayer As-As distances become shorter and the As-As dimers form after the phase *** further compres.sion,Zn/Mn-As bond becomes shortened due to the recovery of isotropic compres.ion on the Zn/MnAs layers.

关键词： magnetic semiconductor high-pressure in-situ X-ray diffraction phase transition

Coevolution of superconductivity and Hall coefficient with anisotropic lattice shrinkage in compres.ed KCa_(2)Fe_(4)As_(24F_(2)

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Chinese Physics B 2024年第7期33卷 66-70页

作者：韩金宇洪文山蔡树赵金瑜郭静周亚洲王鹏玉曹立新罗会仟李世亮吴奇孙力玲 beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China center for high pressure Science&Technology Advanced res.arch Beijing 100094China University of Chinese Academy of Sciences Beijing 100190China

The stability of superconductivity in superconductors is widely recognized to be determined by various factors,including charge,spin,orbit,lattice,and other related degrees of ***,we report our findings on the pressure-induced coevolution of superconductivity and Hall coefficient in KCa_(2)Fe_(4)As_(24F_(2),an iron-based superconductor possessing a hybrid crystal structure combining KFe_(2)As_(2) and *** investigation,involving high-pressure res.stance,Hall effect and x-ray diffraction(XRD) measurements,allows us to observe the connection of the superconductivity and Hall coefficient with the anisotropic lattice *** find that its ambient-pressure tetragonal(T) phase pres.nts a collapse starting at around 18 GPa,where the sign of the Hall coefficient(R_(H)) changes from positive to *** further compres.ion,both superconducting transition temperature(T_(c)) and R_(H) exhibit a monotonous *** around 41 GPa,the superconductivity is completely suppres.ed(T_(c)=0),where the parameter a begins to decline again and the Hall coefficient remains nearly *** experiment res.lts clearly demonstrate that the pressure-induced anisotropic lattice collapse plays a crucial role in tuning the interplay among multiple degrees of freedom in the superconducting system and,corres.ondingly,the stability of the superconductivity.

关键词： effects of pressure pnictides and chalcogenides transport properties

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pressure effects on metal/covalent-organic frameworks:structural and optical properties

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Science China Chemistry 2024年第9期67卷 2890-2903页

作者： Yixuan Wang Yunfeng Yang Xinyi Yang Bo Zou Synergetic Extreme Condition high-pressure Science center State Key Laboratory of Superhard MaterialsCollege of PhysicsJilin UniversityChangchun 130012China

Metal-organic frameworks(MOFs)and covalent organic frameworks(COFs)with highly ordered porous structure,tunable bandgap,large specific surface area and structural diversity,provide an appealing platform for the development of stimulus res.onse,sensing,imaging and *** various tuning methods,pressure engineering using the diamond anvil cell is a highly powerful in-situ technique,which can efficiently modulate the structural and optical properties of MOFs/*** is beyond the realization of traditional chemical *** review outlines the res.arch progres. in the experimentoriented discovery of new phases or unique properties under high pressure,including phase transition,abnormal compres.ion,photoluminescence(PL)discoloration and ***,the improvement of PL quantum yield in MOFs could be achieved by pressure-treated engineering and hydrogen-bonding cooperativity *** also propose and establish the relationship between structure and optical properties under high ***,the challenge and outlook of the current fields are *** hope that this review will supply guidance for comprehending the development of high-pressure MOF/COF-related res.arch fields,and offer novel strategies for designing more high-performance MOF/COF materials to ultimately expand their applications.

关键词： metal/covalent-organic frameworks pressure engineering phase transition abnormal compres.ive behaviors piezochromic behaviors emission enhancement

Evolution of Superconducting-Transition Temperature with Superfluid Density and Conductivity in Pres.urized Cuprate Superconductors

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Chinese Physics Letters 2024年第4期41卷 110-117页

作者：赵金瑜蔡树陈逸雯顾根大闫宏涛郭静韩金宇王鹏玉周亚洲李延春李晓东任治安吴奇周兴江丁阳向涛毛河光孙力玲 Institute of Physics Chinese Academy of SciencesBeijing 100190China center for high pressure Science&Technology Advanced res.arch Beijing 100094China Condensed Matter Physics&Materials Science Department Brookhaven National LaboratoryNY 11973-5000USA University of Chinese Academy of Sciences Beijing 100190China Institute of high Energy Physics Chinese Academy of ScienceBeijing 100049China beijing Academy of Quantum Information Sciences Beijing 100193China

What factors fundamentally determine the value of superconducting transition temperature Tc in high temperature superconductors has been the subject of intense *** the establishment of an empirical law known as Homes'law,there is a growing consensus in the community that the Tc value of the cuprate superconductors is closely linked to the superfluid density(ρ_(s))of its ground state and the conductivity(σ)of its normal ***,all the data supporting this empirical law(ρ_(s)=AσT_(c))have been obtained from the ambientpressure *** this study,we pres.nt the first high-pressure res.lts about the connection of the quantities of ρ_(s) and σ with T_(c),through the studies on the Bi_(1.74)Pb_(0.38)Sr_(1.88)CuO_(6+δ)and Bi_(2)Sr_(2)CaCu_(2)O_(8+δ),in which the value of their high-pressure res.stivity(ρ=1/σ)is achieved by adopting our newly established method,while the quantity ofρs is extracted using Homes'*** highlight that the Tc values are strongly linked to the joint res.onse factors of magnetic field and electric field,i.e.,ρ_(s) and σ,res.ectively,implying that the physics determining T_(c) is governed by the intrinsic electromagnetic fields of the system.

关键词： superconductors Transition Conductivity

Unveiling a novel metal-to-metal transition in LuH_(2):Critically challenging superconductivity claims in lutetium hydrides

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Matter and Radiation at Extremes 2024年第3期9卷 65-73页

作者： Dong Wang Ningning Wang Caoshun Zhang Chunsheng Xia Weicheng Guo Xia Yin Kejun Bu Takeshi Nakagawa Jianbo Zhang Federico Gorelli Philip Dalladay-Simpson Thomas Meier Xujie Lü Liling Sun Jinguang Cheng Qiaoshi Zeng Yang Ding Ho-kwang Mao center for high-pressure Science and Technology Advanced res.arch Beijing 100094China beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China Shanghai Key Laboratory of Material Frontiers res.arch in Extreme Environments(MFree) Shanghai Advanced Research in Physical Sciences(SHARPS)Shanghai 201203China

Following the recent report by Dasenbrock-Gammon et al.[Nature 615,244–250(2023)]of near-ambient superconductivity in nitrogendoped lutetium trihydride(LuH_(3-δ)N_(ε)),significant debate has emerged surrounding the composition and interpretation of the observed sharp res.stance ***,we meticulously revisit these claims through comprehensive characterization and *** definitively identify the reported material as lutetium dihydride(LuH_(2)),res.lving the ambiguity surrounding its *** similar conditions(270–295 K and 1–2 GPa),we replicate the reported sharp decrease in electrical res.stance with a 30%success rate,aligning with the observations by Dasenbrock-Gammon et ***,our extensive investigations reveal this phenomenon to be a novel pressure-induced metal-to-metal transition intrinsic to LuH_(2),distinct from ***,nitrogen doping exerts minimal impact on this *** work not only elucidates the fundamental properties of LuH_(2)andLuH_(3),but also critically challenges the notion of superconductivity in these lutetium hydride *** findings pave the way for future res.arch on lutetium hydride systems,while emphasizing the crucial importance of rigorous verification in claims of ambient-temperature superconductivity.

关键词： res.stance hydride superconductivity

Strong electron correlation-induced Mott-insulating electrides of Ae_(5)X_(3)(Ae=Ca,Sr,and Ba;X=As and Sb)

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Matter and Radiation at Extremes 2024年第3期9卷 74-82页

作者： Ya Xu Lu Zheng Yunkun Zhang Zhuangfei Zhang QianQian Wang Yuewen Zhang Liangchao Chen Chao Fang Biao Wan Huiyang Gou Key Laboratory of Material Physics of Ministry of Education School of Physics and Laboratory of Zhongyuan LightZhengzhou UniversityZhengzhou 450052China School of Mechanical and Equipment Engineering Hebei University of EngineeringHandan 056038China center for high pressure Science and Technology Advanced res.arch Beijing 100094China

The pres.nce of interstitial electrons in electrides endows them with interes.ing attributes,such as low work function,high carrier concentration,and unique magnetic *** knowledge and understanding of electrides are thus of both scientific and technological ***,we employ first-principles calculations to investigate Mott-insulating Ae_(5)X_(3)(Ae=Ca,Sr,and Ba;X=As and Sb)electrides with Mn_(5)Si_(3)-type structure,in which half-filled interstitial electrons serve as ions and are *** Mott-insulating property is induced by strong electron correlation between the neares. interstitial electrons,res.lting in spin splitting and a separation between occupied and unoccupied *** half-filled antiferromagnetic configuration and localization of the interstitial electrons are critical for the Mott-insulating properties of these *** with that in intermetallic electrides,the orbital hybridization between the half-filled interstitial electrons and the surrounding atoms is weak,leading to highly localized magnetic centers and pronounced correlation ***,the Mott-insulating electrides Ae_(5)X_(3)have very large indirect bandgaps(0.30 eV).In addition,high pressure is found to strengthen the strong correlation effects and enlarge the *** pres.nt res.lts provide a deeper understanding of the formation mechanism of Mott-insulating electrides and provide guidance for the search for new strongly correlated electrides.

关键词： intermetallic filled occupied

Experimental study on reactions between alkaline basaltic melt and orthopyroxenes: constraints on the evolution of lithospheric mantle in the North China Craton

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Acta Geochimica 2024年第2期43卷 354-365页

作者： Hanqi He Mingliang Wang Hongfeng Tang Key Laboratory for high Temperature and high pressure Study of the Earth’s Interior Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China University of Chinese Academy of Sciences Beijing 100049China School of res.urce and Civil Engineering Suzhou UniversitySuzhou 234000AnhuiChina

The experimental res.lts of the reactions between an alkaline basaltic melt and mantle orthopyroxenes under high-temperature and high-pressure conditions of 1300–1400℃ and 2.0–3.0 GPa using a six-anvil apparatus are reported in this *** reactions are proposed to simulate the interactions between melts from the asthenospheric mantle and the lithospheric *** starting melt in the experiments was made from the alkaline basalt occurring in Fuxin,Liaoning Province,and the orthopyroxenes were separated from the mantle xenoliths in Damaping,Hebei *** res.lts show that clinopyroxenes were formed in all the reactions between the alkaline basaltic melt and orthopyroxenes under the studied P–T *** formation of clinopyroxene in the reaction zone is mainly controlled by dissolution–crystallization,and the chemical compositions of the reacted melt are primarily infl uenced by the diff usion eff *** is the most important parameter controlling the reactions between the melt and orthopyroxenes,which has a direct impact on the melting of orthopyroxenes and the diff usion of chemical components in the *** also directly controls the chemical compositions of the newly formed clinopyroxenes in the reaction zone and the reacted *** formation of clinopyroxenes from the reactions between the alkaline basaltic melt and orthopyroxenes can res.lt in an increase of CaO and Al_(2)O_(3) contents in the rocks containing this ***,the reactions between the alkaline basaltic melt from the asthenospheric mantle and orthopyroxenes from the lithospheric mantle can lead to the evolution of lithospheric mantle in the North China Craton from refractory to fertile with relatively high CaO and Al 2 O 3 *** addition,the reacted melts in some runs were transformed from the starting alkaline basaltic into tholeiitic after reactions,indicating that tholeiitic magma could be generated from alkaline basaltic one via reactions betwe

关键词： Alkaline basaltic melt Orthopyroxene Melt–mineral reaction high-temperature and high-pressure experiment Genesis of basalt Evolution of lithospheric mantle in the North China Craton

Stability and melting behavior of boron phosphide under high pressure

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Chinese Physics B 2024年第4期33卷 579-584页

作者：梁文嘉向晓君李倩梁浩彭放 Institute of Atomic and Molecular Physics Sichuan UniversityChengdu 610065China School of Mathematics and Physics Southwest University of Science and TechnologyMianyang 621900China center for high pressure Science and Technology Advanced res.arch Shanghai 201203China

Boron phosphide(BP)has gained significant res.arch attention due to its unique photoelectric and mechanical *** this work,we investigated the stability of BP under high pressure using x-ray diffraction and scanning electron *** phase diagram of BP was explored in both B-rich and P-rich environments,revealing crucial insight into its behavior at 5.0 ***,we measured the melting curve of BP from 8.0 GPa to 15.0 *** findings indicate that the stability of BP under high pressure is improved within B-rich and P-rich ***,we report a remarkable observation of melting curve frustration at 10.0 *** study will enhance our understanding of stability of BP under high pressure,shedding light on its potential application in semiconductor,thermal,and light-transmitting devices.

关键词： boron phosphide stability melting curve high pressure