Pressure study of the noncentrosymmetric 5d-electron superconductors CaMSi_3 (M=Ir, Pt)
Pressure study of the noncentrosymmetric 5d-electron superconductors CaMSi_3 (M=Ir, Pt)
复制标题
非中心对称5d电子超导体CaMSi_3 (M=Ir, Pt)的压力研究
DOI：
10.1143/jpsj.81.074711
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发表时间：
2012
影响因子：
1.7
通讯作者：
E. Bauer
中科院分区：
文献类型：
--
作者：
江口学;F. Kneidinger;L. Salamakha;米澤進吾;前野悦輝;E. Bauer
本文报道了Rashba型非中心对称超导体CaMSi_3（M=Ir，Pt）的流体静压研究。这两种化合物的电阻率的温度依赖性很好地描述了在每个压力下的传统的布洛赫-Grüneisen形式主义。这一事实表明，电子-声子散射在这些化合物中占主导地位。两种化合物的超导临界温度Tc在0.41 ~ 2GPa范围内随压力的增加而降低，降低速率约为0.2K/GPa。这种Tc行为可以用基于传统BCS理论的态密度的适度降低来解释。
We report a hydrostatic pressure study on the Rashba-type noncentrosymmetric superconductors CaMSi3(M=Ir, Pt). The temperature dependence of the resistivity of both compounds is well described by the conventional Bloch–Grüneisen formalism at each pressure. This fact suggests that electron–phonon scattering is dominant in these compounds. The superconducting critical temperatureTcdecreases with pressure above 0.41 to 2 GPa at a rate of ∼0.2 K/GPa for both compounds. ThisTcbehavior can be explained with a modest decrease in the density of states based on the conventional BCS theory.