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Evidence of surface superconductivity and multi-quanta vortex states in a weakly-pinned single crystal of Ca3Ir4Sn13

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Title Evidence of surface superconductivity and multi-quanta vortex states in a weakly-pinned single crystal of Ca3Ir4Sn13
 
Creator KUMAR, S
SINGH, RP
THAMIZHAVEL, A
TOMY, CV
GROVER, AK
 
Subject GINZBURG-LANDAU EQUATIONS
SELF-CONSISTENT SOLUTION
PHASE-DIAGRAM
MAGNETIZATION
DISKS
TRANSITIONS
DISORDER
Paramagnetic response
Surface superconductivity
Multi-quanta states
 
Description We report here the observation of anomalous paramagnetic signal(s) in the isofield field-cooled cool-down magnetization scans (M-FCC (T)) recorded for a single crystal of a low T-c superconductor Ca3Ir4Sn13. Novel features emanating from the M-FCC (T) response include an oscillatory magnetization behavior below T-c and a rich multiplicity (non-uniqueness) in magnetization ranging from diamagnetism to paramagnetism at a given H, T value. The metastability in M-FCC (T) has been ascribed to non-unique coexistence of multi-quanta vortex states (L Phi(0); Phi(0) = hc/2e, L > 1) and single quantum (L = 1, Abrikosov) vortices. Additionally, the isothermal M(H) scans recorded across a short window of temperature just below Tc show evidence for only the multi-quanta vortex states in the domain of surface superconductivity, with no fingerprint(s) of pinned Abrikosov lattice. (C) 2014 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE BV
 
Date 2016-01-15T04:55:35Z
2016-01-15T04:55:35Z
2015
 
Type Article
 
Identifier PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 509,42-48
0921-4534
1873-2143
http://dx.doi.org/10.1016/j.physc.2014.11.008
http://dspace.library.iitb.ac.in/jspui/handle/100/17811
 
Language en