Possible high-pressure orbital quantum criticality and an emergent resistive phase in PbRuO3

被引：5
|
作者：
Kusmartseva, Anna F. [1 ,2 ,3 ]
Sinclair, Alexandra [1 ,2 ]
Rodgers, Jennifer A. [1 ,2 ]
Kimber, Simon A. J. [4 ]
Attfield, J. Paul [1 ,2 ]
机构：
[1] Univ Edinburgh, Ctr Sci Extreme Condit, Edinburgh EH9 3JZ, Midlothian, Scotland
[2] Univ Edinburgh, Sch Chem, Edinburgh EH9 3JZ, Midlothian, Scotland
[3] Univ Loughborough, Dept Phys, Loughborough LE11 3TU, Leics, England
[4] European Synchrotron Radiat Facil, F-38043 Grenoble, France
来源：
PHYSICAL REVIEW B | 2013年 / 87卷 / 16期
基金：
英国工程与自然科学研究理事会;
关键词：
SPIN FLUCTUATIONS; SUPERCONDUCTIVITY; TRANSITION; FERROMAGNETISM; RUTHENATE; CA2RUO4; METALS; OXIDES; STATE;
D O I：
10.1103/PhysRevB.87.165130
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The orbital ordering transition in the metallic perovskite PbRuO3 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 Sr3Ru2O7 and heavy fermion conductors. An anomalous increase of resistivity is observed at pressures above similar to 100 kbar, and a transition to a more resistive, possibly semiconducting, phase is observed at 300 kbar and ambient temperature. DOI: 10.1103/PhysRevB.87.165130
引用
收藏
页数：5
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