Superconductivity in the Hexagonal Ternary Phosphide ScIrP
Superconductivity in the Hexagonal Ternary Phosphide ScIrP
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DOI：
10.7566/jpsj.85.013704
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发表时间：
2015-12
期刊：
影响因子：
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通讯作者：
Y. Okamoto;Takumi Inohara;Y. Yamakawa;A. Yamakage;K. Takenaka
中科院分区：
文献类型：
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作者：
Y. Okamoto;Takumi Inohara;Y. Yamakawa;A. Yamakage;K. Takenaka
我们报告的发现，在3.4 K的三元磷化物，ScIrP，它在六方ZrNiAl型结构中结晶没有空间反转对称的体超导转变。根据零磁场下的热容数据，我们认为ScIrP是一种弱耦合的Bardeen-Cooper-Schrieffer超导体。另外，磁场下的实验结果表明，这种材料是一个II型超导体的上临界场Hc 2在磁场高于5 T在零温度。这个适度高的Hc 2并不违反泡利极限，但它确实意味着有一个显着的影响，从强自旋轨道相互作用的Ir 5d电子在非中心对称的晶体结构。电子结构的计算显示了一个有趣的功能ScIrP，其中的Sc 3d和Ir 5d轨道有助于在费米能级的电子态密度。
We report the discovery of a bulk superconducting transition at 3.4 K in the ternary phosphide, ScIrP, which crystallizes in a hexagonal ZrNiAl-type structure without spatial inversion symmetry. On the basis of heat capacity data in a zero magnetic field, ScIrP is suggested to be a weakly-coupled Bardeen-Cooper-Schrieffer superconductor. Alternatively, experimental results under magnetic fields indicate that this material is a type-II superconductor with an upper critical field Hc2 at magnetic fields above 5 T at zero temperature. This moderately high Hc2 does not violate the Pauli limit, but it does imply that there is a significant effect from the strong spin-orbit interaction of Ir 5d electrons in the noncentrosymmetric crystal structure. Electronic structure calculations show an interesting feature of ScIrP, where both the Sc 3d and Ir 5d orbitals contribute to the electronic density of states at the Fermi level.