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arXiv 1208.5873cond-mat.supr-con
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新型BiS2基超导体PrO0 .5F0.5BiS2的合成及超导电性

Synthesis and superconductivity of new BiS2 based superconductor PrO0.5F0.5BiS2

Rajveer Jha, Anuj Kumar, Shiva Kumar Singh, V. P. S. Awana

摘要:

本文报道了PrO_(0.5)F_(0.5)BiS_2的合成及其在3.7K下的超导电性。新发现的材料属于具有ZrCuSiAs型结构的层状硫化物基REO0.5F0.5BiS2化合物。采用真空包埋技术在7800 ℃一步合成了块状多晶化合物。详细的结构分析表明,合成的PrO_(0.5)F_(0.5)BiS_2晶体属于四元晶系P_4/nmm空间群,晶格参数a = 4.015(5)<$,c = 13.362(4)<$。体超导性观察PrO 0.5F 0.5BiS 2低于4K的磁性和运输测量。电输运测量表明,超导转变温度(Tc)起始于3.7K,Tc(ρ=0)起始于3.1K。在热容测量中没有观察到与超导转变有关的T_c处的驼峰,而是在~ 6 K以下观察到一种Schottky型反常。该化合物在正常状态下是轻微半导体的。等温磁化强度(MH)表现出典型的II型行为,低临界场(Hc 1)约为8 Oe。

英文摘要:

We report synthesis and superconductivity at 3.7K in PrO0.5F0.5BiS2. The newly discovered material belongs to the layered sulfide based REO0.5F0.5BiS2 compounds having ZrCuSiAs type structure. The bulk polycrystalline compound is synthesized by vacuum encapsulation technique at 7800C in single step. Detailed structural analysis has shown that the as synthesized PrO0.5F0.5BiS2 is crystallized in tetragonal P4/nmm space group with lattice parameters a = 4.015(5) Å, c = 13.362(4) Å. Bulk superconductivity is observed in PrO0.5F0.5BiS2 below 4K from magnetic and transport measurements. Electrical transport measurements showed superconducting transition temperature (Tc) onset at 3.7K and Tc (ρ=0) at 3.1K. Hump at Tc related to superconducting transition is not observed in heat capacity measurement and rather a Schottky-type anomaly is observed at below ~6K. The compound is slightly semiconducting in normal state. Isothermal magnetization (MH) exhibited typical type II behavior with lower critical field (Hc1) of around 8Oe.

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