Transport properties in normal-metal Bi2Pd3S2 and superconducting Bi2Pd3Se2
Transport properties in normal-metal Bi2Pd3S2 and superconducting Bi2Pd3Se2
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DOI：
10.1103/physrevb.78.024509
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发表时间：
2008-07-01
影响因子：
3.7
通讯作者：
Hinatsu, Yukio
中科院分区：
文献类型：
--
作者：
Sakamoto, Takeshi;Wakeshima, Makoto;Hinatsu, Yukio
研究了与帕克石有关的化合物Bi_2 Pd_3X_2（X=S，Se）的输运性质。这两种化合物的电导率在400 K以下表现出典型的金属行为。低温下的电阻率和比热测量结果表明，Bi_2 Pd_3Se_2在低于1 K的温度下是超导的。另一方面，Bi_2Pd_3S_2在低至0.35K时没有表现出体超导转变。在正常状态下，电子比热系数γ和德拜温度θ（D）分别为5.9 mJ/mol K-2和170 K，对于Bi 2 Pd 3 Se 2，分别为8.3 mJ/mol K-2和150 K。在Bi_2 Pd_3Se_2的超导状态下，Bi_2 Pd_3Se_2在零温度下的上临界场为290 mT。从超导温度范围内的电子比热，发现Bi_2 Pd_3Se_2属于s波弱耦合超导体。
The transport properties of the parkerite-related compounds Bi2Pd3X2 (X=S,Se) were studied. The electrical resistivities of both compounds show typical metallic behavior up to 400 K. Resistivity and specific heat measurements at low temperatures reveal that Bi2Pd3Se2 is superconducting below 1 K. On the other hand, Bi2Pd3S2 does not show a bulk superconducting transition down to 0.35 K. In the normal state, the electronic specific heat coefficient gamma and the Debye temperature Theta(D) are found to be 5.9 mJ/mol K-2 and 170 K, respectively for Bi2Pd3S2, and 8.3 mJ/mol K-2 and 150 K, respectively for Bi2Pd3Se2. In the superconducting state for Bi2Pd3Se2, the upper critical field at zero temperature for Bi2Pd3Se2 is 290 mT. From the electronic specific heat in the superconducting temperature range, it was found that Bi2Pd3Se2 belongs to an s-wave weak-coupling superconductor.