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Pb掺杂对Cd2Ru2O7反常金属态的调控

焦媛媛 孙建平 Prashant Shahi 刘哲宏 王铂森 龙有文 程金光

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Pb掺杂对Cd2Ru2O7反常金属态的调控

焦媛媛, 孙建平, Prashant Shahi, 刘哲宏, 王铂森, 龙有文, 程金光

Effect of Pb doping on metallic state of cubic pyrochlore Cd2Ru2O7

Jiao Yuan-Yuan, Sun Jian-Ping, Prashant Shahi, Liu Zhe-Hong, Wang Bo-Sen, Long You-Wen, Cheng Jin-Guang
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  • 具有烧绿石结构的Cd2Ru2O7在形成长程反铁磁序的同时进入反常的金属态.采用高压高温方法制备了一系列Pb掺杂的Cd2-xPbxRu2O7(0 x 2)多晶样品,并系统研究了其晶体结构和电阻率、磁化率、热电势等物理性质.尽管Pb2Ru2O7是泡利顺磁金属,但少量Pb2+掺杂的样品Cd1.8Pb0.2Ru2O7却呈现出明显的金属-绝缘体转变,与施加静水压和少量Ca2+掺杂的效果类似.通过与类似的烧绿石Ru5+氧化物进行对比,提出Cd2Ru2O7中的Ru5+-4d3电子态恰好处于巡游到局域过渡的区域,少量Pb2+掺杂造成的晶格无序增强了电子的局域性,使得形成反铁磁序的同时伴随出现了金属-绝缘体转变.这表明具有烧绿石结构的Ru5+氧化物是研究巡游-局域电子转变的理想材料体系.
    Many exotic phenomena in strongly correlated electron systems, such as unconventional superconductivity, metal-insulator transition, and quantum criticality, take place in the intermediate regime between localized and itinerant electronic state. To understand the electronic behaviors near the localized-to-itinerant crossover remains a challenging problem in condensed matter physics. The Ru5+ cubic pyrochlores A2Ru2O7 (A=Cd, Cd, Hg) constitute such a system that the Ru-4d electrons acquire characters of both itinerancy and localization. In addition, the magnetic Ru5+ ions that are situated on the vertices of corner-shared tetrahedral lattice are expected to experience strong geometrical frustration given an antiferromagnetic (AF) arrangement. In this work, we investigate the cubic pyrochlore Cd2Ru2O7, which develops a peculiar metallic state below the AF transition. We synthesize a series of Pb-doped Cd2-xPbxRu2O7 (0 x 2) polycrystalline samples under high-pressure condition, and study the effects of Pb doping on their crystal structure and physical properties. Although the Pb2Ru2O7 pyrochlore is a Pauli paramagnetic metal, we find that the substitution of 10% Pb2+ for Cd2+ in Cd1.8Pb0.2Ru2O7 converts the metallic state of Cd2Ru2O7 into an insulating ground state, in a manner similar to the consequence of exerting hydrostatic pressure or substituting 10% Ca2+ for Cd2+ ions as we found recently. We propose that the electronic state of Cd2Ru2O7 be located at the itinerancy to localization crossover, and the introduction of chemical disorder via Pb2+ substitution may enhance the localized character and induce the metal-to-insulator transition. Our results further demonstrate that the cubic Ru5+ pyrochlore oxides offer an important paradigm for studying the exotic physics of correlated electrons on the border of (de)localization in the presence of strong geometrical frustration.
      通信作者: 程金光, jgcheng@iphy.ac.cn
    • 基金项目: 国家重点研发计划(批准号:2018YFA0305700)、国家重点基础研究发展计划(批准号:2014CB921500)、国家自然科学基金(批准号:11574377)和中国科学院前沿科学重点项目(批准号:QYZDB-SSW-SLH013)资助的课题.
      Corresponding author: Cheng Jin-Guang, jgcheng@iphy.ac.cn
    • Funds: Project supported by the National Key RD Program of China (Grant No. 2018YFA0305700), the National Basic Research Program of China (Grant No. 2014CB921500), the National Natural Science Foundation of China (Grant No. 11574377), and the Key Research Program of Frontier Sciences of the Chinese Academy of Sciences, China (Grant No. QYZDB-SSW-SLH013).
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    [2]

    Bednorz J G, Muller K A 1986 Z. Phys. B 64 189

    [3]

    Imada M, Fujimori A, Tokura Y 1998 Rev. Mod. Phys. 70 1039

    [4]

    Morosan E, Natelson D, Nevidomskyy A H, Si Q 2012 Adv. Mater. 24 4896

    [5]

    Gegenwart P, Si Q, Steglich F 2008 Nat. Phys. 4 186

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    Miyazaki M, Kadono R, Satoh K H, Hiraishi M, Takeshita S, Koda A, Yamamoto A, Takagi H 2010 Phys. Rev. B 82 094413

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    Munenaka T, Sato H 2006 J. Phys. Soc. Jpn. 75 103801

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    Taniguchi T, Munenaka T, Sato H 2009 J. Phys.:Conf. Ser. 145 012017

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    Gardner J S, Gingras M J P, Greedan J E 2010 Rev. Mod. Phys. 82 53

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    Wang R, Sleight A W 1998 Mater. Res. Bull. 33 1005

    [11]

    Yamamoto A, Sharma P A, Okamoto Y, Nakao A, Katori H A, Niitaka S, Hashizume D, Takagi H 2007 J. Phys. Soc. Jpn. 76 043703

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    Klein W, Kremer R K, Jansen M 2007 J. Mater. Chem. 17 1356

    [13]

    Duijin J V, Ruiz-Bustos R, Daoud-Aladine A 2012 Phys. Rev. B 86 214111

    [14]

    Tachibana M, Kohama Y, Shimoyama T, Harada A, Taniyama T, Itoh M, Kawaji H, Atake T 2006 Phys. Rev. B 73 193107

    [15]

    Shannon R D 1976 Acta Cryst. A 32 751

    [16]

    Mott N F 1969 Phil. Mag. 19 835

    [17]

    Mott N F 1967 Adv. Phys. 16 49

    [18]

    Fritzsche H 1971 Solid State Comm. 9 1813

    [19]

    Mandrus D, Thompson J R, Gaal R, Forro L, Bryan J C, Chakoumakos B C, Woods L M, Sales B C, Fishman R S, Keppens V 2001 Phys. Rev. B 63 195104

    [20]

    Kim B J, Jin H, Moon S J, Kim J Y, Park B G, Leem C S, Yu J, Noh T W, Kim C, Oh S J, Park J H, Durairaj V, Cao G, Rotenberg E 2008 Phys. Rev. Lett. 101 076402

  • [1]

    Goodenough J B 2001 Localized to Itinerant Electronic Transition in Perovskite Oxides, In Structure and Bonding (Vol. 98) (Berlin:Springer)

    [2]

    Bednorz J G, Muller K A 1986 Z. Phys. B 64 189

    [3]

    Imada M, Fujimori A, Tokura Y 1998 Rev. Mod. Phys. 70 1039

    [4]

    Morosan E, Natelson D, Nevidomskyy A H, Si Q 2012 Adv. Mater. 24 4896

    [5]

    Gegenwart P, Si Q, Steglich F 2008 Nat. Phys. 4 186

    [6]

    Miyazaki M, Kadono R, Satoh K H, Hiraishi M, Takeshita S, Koda A, Yamamoto A, Takagi H 2010 Phys. Rev. B 82 094413

    [7]

    Munenaka T, Sato H 2006 J. Phys. Soc. Jpn. 75 103801

    [8]

    Taniguchi T, Munenaka T, Sato H 2009 J. Phys.:Conf. Ser. 145 012017

    [9]

    Gardner J S, Gingras M J P, Greedan J E 2010 Rev. Mod. Phys. 82 53

    [10]

    Wang R, Sleight A W 1998 Mater. Res. Bull. 33 1005

    [11]

    Yamamoto A, Sharma P A, Okamoto Y, Nakao A, Katori H A, Niitaka S, Hashizume D, Takagi H 2007 J. Phys. Soc. Jpn. 76 043703

    [12]

    Klein W, Kremer R K, Jansen M 2007 J. Mater. Chem. 17 1356

    [13]

    Duijin J V, Ruiz-Bustos R, Daoud-Aladine A 2012 Phys. Rev. B 86 214111

    [14]

    Tachibana M, Kohama Y, Shimoyama T, Harada A, Taniyama T, Itoh M, Kawaji H, Atake T 2006 Phys. Rev. B 73 193107

    [15]

    Shannon R D 1976 Acta Cryst. A 32 751

    [16]

    Mott N F 1969 Phil. Mag. 19 835

    [17]

    Mott N F 1967 Adv. Phys. 16 49

    [18]

    Fritzsche H 1971 Solid State Comm. 9 1813

    [19]

    Mandrus D, Thompson J R, Gaal R, Forro L, Bryan J C, Chakoumakos B C, Woods L M, Sales B C, Fishman R S, Keppens V 2001 Phys. Rev. B 63 195104

    [20]

    Kim B J, Jin H, Moon S J, Kim J Y, Park B G, Leem C S, Yu J, Noh T W, Kim C, Oh S J, Park J H, Durairaj V, Cao G, Rotenberg E 2008 Phys. Rev. Lett. 101 076402

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  • PDF下载量:  141
  • 被引次数: 0
出版历程
  • 收稿日期:  2018-02-22
  • 修回日期:  2018-04-11
  • 刊出日期:  2019-06-20

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