Vortex-glass transformation within the surface superconducting state of β-phase Mo1-xRex alloys

被引：5
|
作者：
Sundar, Shyam [1 ,2 ]
Chattopadhyay, M. K. [1 ,2 ]
Chandra, L. S. Sharath [2 ]
Rawat, R. [3 ]
Roy, S. B. [1 ,2 ]
机构：
[1] Homi Bhabha Natl Inst, Raja Ramanna Ctr Adv Technol, Indore 452013, Madhya Pradesh, India
[2] Raja Ramanna Ctr Adv Technol, Magnet & Superconducting Mat Sect, Indore 452013, Madhya Pradesh, India
[3] UGC DAE Consortium Sci Res, Khandwa Rd, Indore 452001, Madhya Pradesh, India
来源：
SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2017年 / 30卷 / 02期
关键词：
vortex-glass state; surface mixed state; surface superconductivity; electrical resistivity; metals and alloys; HIGH-TEMPERATURE SUPERCONDUCTORS; 2-DIMENSIONAL GAUGE GLASS; TYPE-2; SUPERCONDUCTORS; II SUPERCONDUCTORS; CRITICAL CURRENTS; SINGLE-CRYSTALS; CRITICAL-FIELD; THIN-FILMS; TRANSITION; SHEATH;
D O I：
10.1088/0953-2048/30/2/025003
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have performed an experimental study on the temperature dependence of electrical resistivity rho(T) and heat capacity C(T) of the Mo1-xRex (x = 0.20, 0.25) alloy superconductors in different magnetic fields. In the presence of applied magnetic field, the electrical resistivity of these alloys goes to zero at a temperature well above the bulk superconducting transition temperature obtained with the help of heat capacity measurements in the same magnetic field. Our study indicates the presence of a surface superconducting state in these alloys, where the flux lines are pinned in the surface sheath of the superconductor. The configuration of the flux lines (two-dimensional pancake-like) in the surface sheath is understood in the realm of the flux-spot model. Experimental evidence in support of the surface mixed-state state or 'Kulik vortex-state' and the occurrence of a vortex-liquid to vortex-glass transition is presented.
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页数：8
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