Large anisotropic thermal conductivity of the intrinsically two-dimensional metallic oxide PdCoO2

被引：27

作者：

Daou, Ramzy ^{[1
]}

Fresard, Raymond ^{[1
]}

Hebert, Sylvie ^{[1
]}

Maignan, Antoine ^{[1
]}

机构：

[1] CNRS ENSICAEN UCBN, Lab CRISMAT, UMR6508, F-14050 Caen, France

来源：

PHYSICAL REVIEW B | 2015年 / 91卷 / 04期

关键词：

THERMOELECTRIC-POWER; SUPERCONDUCTIVITY; GAS;

D O I：

10.1103/PhysRevB.91.041113

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The highly conductive layered metallic oxide PdCoO2 is a near-perfect analog to an alkali metal in two dimensions. It is distinguished from other two-dimensional (2D) electron systems where the Fermi surface does not reach the Brillouin zone boundary by a high planar electron density exceeding 10(15) cm(-2). The simple single-band quasi-2D electronic structure results in strongly anisotropic transport properties and limits the effectiveness of electron-phonon scattering. Measurements on single crystals in the temperature range from 10 to 300 K show that the thermal conductivity is much more weakly anisotropic than the electrical resistivity, as a result of significant phonon heat transport. The in-plane thermoelectric power is linear in temperature at 300 K and displays a purity-dependent peak around 50 K. Given the extreme simplicity of the band structure, it is possible to identify this peak with phonon drag driven by normal electron-phonon scattering processes.

引用

页数：5

共 32 条

[1] THERMAL-CONDUCTIVITY OF INSULATING BI2SR2YCU2O8 AND SUPERCONDUCTING BI2SR2CACU2O8 - FAILURE OF THE PHONON-GAS PICTURE [J].

ALLEN, PB ;

DU, XQ ;

MIHALY, L ;

FORRO, L .

PHYSICAL REVIEW B, 1994, 49 (13) :9073-9079

[2] PHONON-DRAG PART OF THERMOELECTRIC POWER IN METALS [J].

BAILYN, M .

PHYSICAL REVIEW, 1967, 157 (03) :480-&

[3] THE TEMPERATURE-DEPENDENT ELECTRICAL RESISTIVITIES OF THE ALKALI-METALS [J].

BASS, J ;

PRATT, WP ;

SCHROEDER, PA .

REVIEWS OF MODERN PHYSICS, 1990, 62 (03) :645-744

[4] POSSIBLE HIGH-TC SUPERCONDUCTIVITY IN THE BA-LA-CU-O SYSTEM [J].

BEDNORZ, JG ;

MULLER, KA .

ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER, 1986, 64 (02) :189-193

[5] On the thermoelectricity of correlated electrons in the zero-temperature limit [J].

Behnia, K ;

Jaccard, D ;

Flouquet, J .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2004, 16 (28) :5187-5198

[6]

Blatt J., 1976, Thermoelectric Power of Metals, DOI [10.1007/978-1-4613-4268-7, DOI 10.1007/978-1-4613-4268-7]

[7] MODEL FOR LATTICE THERMAL CONDUCTIVITY AT LOW TEMPERATURES [J].

CALLAWAY, J .

PHYSICAL REVIEW, 1959, 113 (04) :1046-1051

[8] On the metallic conductivity of the delafossites PdCoO2 and PtCoO2 [J].

Eyert, Volker ;

Fresard, Raymond ;

Maignan, Antoine .

CHEMISTRY OF MATERIALS, 2008, 20 (06) :2370-2373

[9]

Foiles C. L., 1985, LANDOLT BORNSTEIN B, V15, P1

[10] Charge ordering, commensurability, and metallicity in the phase diagram of the layered NaxCoO2 -: art. no. 247001 [J].

Foo, ML ;

Wang, YY ;

Watauchi, S ;

Zandbergen, HW ;

He, T ;

Cava, RJ ;

Ong, NP .

PHYSICAL REVIEW LETTERS, 2004, 92 (24) :247001-1

← 1 2 3 4 →