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arXiv 1307.0645cond-mat.supr-con
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Hydrostatic pressure对新型BiS2基Bi4O4S3和NdO0.5F 0.5BiS2层状超导体Tc的影响

Hydrostatic pressure effect on Tc of new BiS2 based Bi4O4S3 and NdO0.5F0.5BiS2 layered superconductors

G. Kalai Selvan, M. Kanagaraj, S. Esakki Muthu, Rajveer Jha, V. P. S. Awana, S. Arumugam

摘要:

本文研究了外部流体静压对新型层状超导体Bi_4 O_4S_3和Nd_(0.5)F_(0.5)Bi_2S_3超导转变温度(Tc)的影响。虽然Bi_4 O_4S_3超导体的Tc从4.8 K到4.3 K(dTconset/dP = -0.28 K/GPa)有适度的下降,但Nd_(0.5)F_(0.5)Bi_2S_3超导体的Tc从4.6 K到5 K(dTconset/dP = 0.44 K/GPa)增加到1.31 GPa,然后从5 K到4.7 K突然下降到1.75 GPa。这些系统中Tc的变化可能与在外加压力下态密度中载流子的增加或减少有关。

英文摘要:

We investigate the external hydrostatic pressure effect on the superconducting transition temperature (Tc) of new layered superconductors Bi4O4S3 and NdO0.5F0.5BiS2. Though the Tc is found to have moderate decrease from 4.8 K to 4.3 K (dTconset/dP = -0.28 K/GPa) for Bi4O4S3 superconductor, the same increases from 4.6 K to 5 K (dTconset/dP = 0.44 K/GPa) upto 1.31 GPa followed by a sudden decrease from 5 K to 4.7 K upto 1.75 GPa for NdO0.5F0.5BiS2 superconductor. The variation of Tc in these systems may be correlated to increase or decrease of the charge carriers in the density of states under externally applied pressure.

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