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Electron mass enhancement and magnetic phase separation near the Mott transition in double-layer ruthenates

Frontiers of physics 2018年第4期13卷 159-165页

作者： Jin Peng X. M. Gu G. T. Zhou W. Wang J. Y. Liu Yu Wang Z. Q. Mao X. S. Wu Shuai Dong School of Physics Southeast University Nanjing 211189 China Collaborative Innovation Center of Advanced Microstrucutres Lab of Solid State Microstructures School of Physics Nanjing University Nanjing 210093 China Department of Physics and Engineering Physics Tulane University New Orleans LA 70118 USA

We present a detailed investigation of the specific heat of Ca3（Ru1-xMx）2O7 （M = Ti, Fe, Mn） single crystals. Depending on the dopant and doping level, three distinct regions are present： a quasi- two-dimensional metallic state with antiferromagnetic （AFM） order formed by ferromagnetic bilayers （AFM-b）, a Mott insulating state with G-type AFM order （G-AFM）, and a localized state with a mixed AFM-b and G-AFM phase. Our specific heat data provide deep insights into the Mort transitions induced by Ti and Mn doping. We observed not only an anomalous large mass enhancement, but also an additional term in the specific heat, i.e., C ∝ T2, in the localized region. The C ∝ T2 term is most likely due to long-wavelength excitations with both FM and AFM components. A decrease in the Debye temperature is observed in the G-type AFM region, indicating lattice softening associated with the Mott transition.

关键词： specific heat ruthenates Mort insulator phase separation

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Role of A-sites in pyrochlore lanthanide ruthenate for electrocatalysis of oxygen evolution reaction

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Journal of Materiomics 2024年第6期10卷 1234-1242页

作者： Hengyu Guo Zhengping Zhang Feng Wang State Key Laboratory of Chemical Resource Engineering Beijing Key Laboratory of Electrochemical Process and Technology for MaterialsBeijing University of Chemical TechnologyBeijing100029China Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing100029China

Developing highly stable and efficient catalysts for oxygen evolution reaction(OER)is extremely important to sustainable energy conversion and storage,but improved efficiency is largely hindered by sluggish reaction *** and bimetal ruthenates have emerged as one of the promising substitutes to replace single-metal ruthenium or iridium oxides,but the fundamental understanding the role of A-site cations is still ***,a family of lanthanides(Ln=all the lanthanides except Pm)are applied to synthesize pyrochlore lanthanide ruthenates(Ln_(2)Ru_(2)O_(7)),and only Ln_(2)Ru_(2)O_(7)(Ln=Sm,Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb,or Lu)with pure phase can be obtained by the ambient-pressure *** with the perovskite ruthenates(SrRuO_(3))and rutile RuO_(2),the[RuO_(6)]units in these Ln_(2)Ru_(2)O_(7) present the largely distorted configurations and different energy level splitting to prevent the excessive Ru oxidation and dissolution,which leads the primary improvement in the electrocatalytic OER *** the similar crystalline field split states,the charge transfer between[RuO6]units and Ln^(3+)cations also affect catalytic activities,even in the Ln_(2)Ru_(2)O_(7) surface reconstruction during the OER ***,Tb_(2)Ru_(2)O_(7) showed the highest OER performance among all the prepared Ln_(2)Ru_(2)O_(7) with similar morphologies and *** systematic work gives fundamental cognition to rational design of high-performance OER electrocatalysts in proper water electrolysis technologies.

关键词： Pyrochlores Lanthanides ruthenates Electrocatalysts Oxygen evolution reaction

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Optical spectroscopy study of Ca_3(Ru_(0.91)Mn_(0.09))_2O_7 single crystal in high magnetic fields

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Science Bulletin 2019年第1期64卷 20-25页

作者： Xueli Xu Jin Peng Junpei Zhang Zongwei Ma Cheng Chen Junbo Han Bingjie Liu Lingfang Lin Xiaoshan Wu Zhiqiang Mao Zhe Qu Zhigao Sheng Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory Chinese Academy of Sciences University of Science and Technology of China Collaborative Innovation Center of Advanced Microstructures Nanjing University School of Physics Southeast University Wuhan National High Magnetic Field Center Huazhong University of Science and Technology School of Physics Nanjing University Department of Physics and Engineering Physics Tulane University

The magneto-optical spectrum, with magnetic fields up to 42 T, of double layered ruthenates Ca_3(Ru_(0.91)Mn_(0.09))_2O_7(CRMO) single crystal is studied. Both the temperature and magnetic field induced insulator-to-metal transitions(IMTs) are observed via magneto-optical properties of the crystal. The critical magnetic field(H//c) of IMT for CRMO is found to be as large as 35 T at 5 K. The fine structure of optical spectra identified the antiferromagnetic/ferro-orbital-ordering configurations of Ru 4d orbitals at low temperatures. Meanwhile, the configuration of orbital polarization of such double-layer CRMO single crystal is discussed. These results suggest that the orbital degree of freedom plays an important role in the field induced IMT of multi-orbital system.

关键词： ruthenates High magnetic field Optical spectroscopy Insulator to metal transition

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Structure and chemical valence study of Sr_(n+1)Ru_nO_(3n+1)(n= 1, 2, ∞) series

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Chinese Physics B 2015年第5期24卷 428-432页

作者：郑龙朱小芹眭永兴薛建忠刘波裴明旭 School of Mathematics and Physics Jiangsu University of Technology

Effect of structure parameter n and its coupling with the connection mode among RuO6 octahedra of Srn＋1RUnO3n＋1 （n = 1, 2, ∞） are investigated. The gradually enhanced rotation and tilting effect with increasing n are observed in Srn＋1RUnO3n＋1. Besides, the chemical valence of Ru is not changed, while the one of Sr gradually varies with increasing n, which highlights the great contribution of connection mode to the chemical environment. Our results show a strong n dependence on the connection mode between octahedra in Srn＋1RUnO3n＋1 （n = 1, 2, ∞）.

关键词： ruthenates structure parameter x-ray diffraction extended x-ray absorption fine structure

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Stability,electronic and magnetic properties of Ca3Ru2O7

Stability,electronic and magnetic properties of Ca3Ru2O7

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2011 First International Conference on High Performance Structures and Materials Engineering (ICHPSM 2011)

作者： Jinhong Xue Jingchao Chen Jie Yu Jing Feng Yong Pan Rong Chen Wenting Lu Key Lab of Advanced Materials in Rare&Precious and Non-ferrous Metals Ministry of EducationKunming University of Science and Technology Kunming Institute of Precious Metals

CaRuO is new tpye of thermoelectric materials.A theoretical study is presented for the stability,electronic and magnetic properties of three phases of this new thermoelectric materials in the framework of density functional theory(DFT).The calculated cohesive energy is-7.94eV/***2 are less stable than other *** calculations indicate that CaRuO is metallic in *** covalent bonds in these structures are due to orbital overlap between p bands of O and d bands of Ru,and DOS at Fermi level are dominated by d bands of *** phase have obvious magnetic moments.

关键词： Density functional theory ruthenates Electronic structures thermo-electric materials

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