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Pressure effect and superconducting properties of lithium ternary borides

Authors :
Shigeru Kasahara
Hiroyuki Takeya
Mohammed El Massalami
Takashi Mochiku
Kazumasa Togano
Kazuto Hirata
Source :
Physica C: Superconductivity and its Applications. :89-90
Publication Year :
2007
Publisher :
Elsevier BV, 2007.

Abstract

Li 2 Pd 3 B and Li 2 Pt 3 B show superconducting transition at the temperatures, 7.4 K and 2.6 K, respectively. These materials have the same cubic structure ( P 4 3 32) composed of distorted octahedrons, whose corners are occupied by Pd/Pt. This structure does not have mirror or inversion symmetry along any directions. It is a very interesting feature of those materials in relation to the symmetry of superconductivity. The samples were prepared by a two-stage arc-melting method. Their superconductivity is induced by Li addition. Controlling the Li stoichiometry is a key to synthesize high quality samples in the preparation process of arc-melting because Li is volatile at high temperatures. The specific heat measurements were carried out by heat-pulse relaxation and semi-adiabatic methods. Pressure effect was measured with a SQUID magnetometer using a low temperature hydrostatic micropressure cell at pressures up to around 1 GPa. The superconducting transition temperatures of both Li 2 Pd 3 B and Li 2 Pt 3 B decreased linearly with pressure. The pressure dependence, d T c /d P , were 0.091 and 0.090 K/GPa, respectively.

Details

ISSN :
09214534
Database :
OpenAIRE
Journal :
Physica C: Superconductivity and its Applications
Accession number :
edsair.doi...........28b58abc3d7f1afa6a5de17570204708
Full Text :
https://doi.org/10.1016/j.physc.2007.03.162