期刊
PHYSICAL REVIEW B
卷 94, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.94.035111
关键词
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资金
- Agence National de la Recherche through SUPERFIELD project
- Agence National de la Recherche through QUANTUMLIMIT project
- China Scholarship Council
- National Basic Research Program of China [2012CB821404]
- ARC project TheMoTherm from the Communaute francaise de Belgique [GA 10/15-03]
- ARC project AIMED from the Communaute francaise de Belgique [GA 15/19-09]
- PDR project from the Fonds National pour la Recherche Scientifique (Belgium) [GA T.1077.15]
Cubic SrTiO3 becomes tetragonal below 105 K. The antiferrodistortive (AFD) distortion leads to clockwise and counterclockwise rotation of adjacent TiO6 octahedra. This insulator becomes a metal upon the introduction of extremely low concentration of n-type dopants. However, signatures of the structural phase transition in charge conduction have remained elusive. Employing the Montgomery technique, we succeed in resolving the anisotropy of charge conductivity induced by the AFD transition, in the presence of different types of dopants. We find that the slight lattice distortion (<6 x 10(-4)) gives rise to a 20% anisotropy in charge conductivity, in agreement with the expectations of band calculations. Application of uniaxial strain amplifies the detectable anisotropy by disfavoring one of the three possible tetragonal domains. In contrast with all other known anisotropic Fermi liquids, the anisotropy has opposite signs for elastic and inelastic scattering. Increasing the concentration of dopants leads to a drastic shift in the temperature of the AFD transition either upward or downward. The latter result puts strong constraints on any hypothetical role played by the AFD soft mode in the formation of Cooper pairs and the emergence of superconductivity in SrTiO3.
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