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Possible high-pressure orbital quantum criticality and an emergent resistive phase in PbRuO_3

机译：PbRuO_3中可能的高压轨道量子临界和一个新兴的电阻相

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摘要

The orbital ordering transition in the metallic perovskite PbRuO_3 is suppressed from 90 K at ambient pressure towards zero temperature at 50 kbar, where non-Fermi liquid resistivity with a temperature exponent n = 1.6 is observed. This evidences a possible quantum critical point brought about by orbital fluctuations, rather than spin fluctuations as observed in Sr_3Ru_2O_7 and heavy fermion conductors. An anomalous increase of resistivity is observed at pressures above ～ 100 kbar, and a transition to a more resistive, possibly semiconducting, phase is observed at 300 kbar and ambient temperature.
机译：金属钙钛矿PbRuO_3的轨道有序过渡在环境压力下从90 K抑制到50 kbar的零温度，在该处观察到非费米液体电阻率的温度指数为n = 1.6。这证明了由轨道波动引起的可能的量子临界点，而不是在Sr_3Ru_2O_7和重费米子导体中观察到的自旋波动。在高于约100 kbar的压力下观察到电阻率异常增加，并且在300 kbar和环境温度下观察到过渡到更具电阻性（可能是半导体）的相。

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  • 来源
    《Physical review》 |2013年第16期|165130.1-165130.5|共5页
  • 作者

    Anna F. Kusmartseva; Alexandra Sinclair; Jennifer A. Rodgers; Simon A. J. Kimber; J. Paul Attfield;

  • 作者单位

    Centre for Science at Extreme Conditions and School of Chemistry, University of Edinburgh, King's Buildings, Mayfield Road, Edinburgh EH9 3JZ, United Kingdom,Department of Physics, Loughborough University, Leicestershire LE11 3TU, United Kingdom;

    Centre for Science at Extreme Conditions and School of Chemistry, University of Edinburgh, King's Buildings, Mayfield Road, Edinburgh EH9 3JZ, United Kingdom;

    Centre for Science at Extreme Conditions and School of Chemistry, University of Edinburgh, King's Buildings, Mayfield Road, Edinburgh EH9 3JZ, United Kingdom;

    European Synchrotron Radiation Facility, Boite Postale 220, 38043 Grenoble Cedex, France;

    Centre for Science at Extreme Conditions and School of Chemistry, University of Edinburgh, King's Buildings, Mayfield Road, Edinburgh EH9 3JZ, United Kingdom;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    electronic conduction in metals and alloys; transition-metal compounds;

    机译：金属和合金中的电子传导;过渡金属化合物;

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