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arXiv 1406.4231cond-mat.supr-con
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hydrostatic pressures对新型BiS2基REO0. 5 F_(0.5)BiS_2(RE-La,Pr,Nd)超导体超导电性的影响

Effect of hydrostatic pressures on the superconductivity of new BiS2 based REO0.5F0.5BiS2 (RE-La, Pr and Nd) superconductors

Rajveer Jha, H. Kishan, V. P. S. Awana

摘要:

通过直流电阻率的测量,研究了静水压力对新型BiS 2基层状REO 0.5F0.5BiS2(RE-La,Pr,Nd)化合物超导电性的影响.采用真空包封固相反应法合成了RE O_(0.5)F_(0.5)BiS_2(RE-La,Pr,Nd)化合物,其晶体结构为四元晶系,P4/nmm空间群。在常压下,LaO_(0.5)F_(0.5)BiS_2、PrO_(0.5)F_(0.5)BiS_2和NdO_(0.5)F_(0.5)BiS_2的超导转变起始温度分别为2.7K、3.5K和4.5K。REO_(0.5)F_(0.5)BiS_2(RE-La,Pr和Nd)的正常态电阻率随压力的增大而减小。通过测量磁场和压力下的电阻率,估算出LaO_(0.5)F_(0.5)BiS_2、PrO_(0.5)F_(0.5)BiS_2和NdO_(0.5)F_(0.5)BiS_2的上临界磁场分别为15.9Tesla、8.8Tesla和8.2Tesla。在中等压力下研究的新型BiS 2基超导体的超导电性的显著增强引起了凝聚态物理界的关注。

英文摘要:

We study the impact of hydrostatic pressure on superconductivity of new BiS2 based layered REO0.5F0.5BiS2 (RE-La, Pr, and Nd) compounds through the measurements of dc electrical resistivity. The REO0.5F0.5BiS2 (RE-La, Pr and Nd) compounds synthesized by solid state reaction route via vacuum encapsulation are crystallized in the tetragonal P4/nmm space group. At ambient pressure the superconducting transition onset temperatures are 2.7K, 3.5K and 4.5K which are enhanced substantially under external hydrostatic pressure to 10.5K, 7.8K and 7.5K for LaO0.5F0.5BiS2, PrO0.5F0.5BiS2 and NdO0.5F0.5BiS2 respectively at 1.68GPa. The normal state electrical resistivity decreases with applied pressure for REO0.5F0.5BiS2 (RE-La, Pr and Nd). The electrical resistivity under magnetic field and applied pressure has been measured to estimate upper critical field, the values of which are 15.9Tesla, 8.8Tesla and 8.2Tesla for LaO0.5F0.5BiS2, PrO0.5F0.5BiS2 and NdO0.5F0.5BiS2 compounds. Substantial enhancement of superconductivity under moderate pressures in studied new BiS2 based superconductors call for the attention of condensed matter physics community.

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