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Identification of the inverse melting line in the vortex phase diagram of a low T-c superconductor, Ca3Rh4Sn13

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Title Identification of the inverse melting line in the vortex phase diagram of a low T-c superconductor, Ca3Rh4Sn13
 
Creator BABU, MS
THAMIZHAVEL, A
RAMAKRISHNAN, S
TOMY, CV
GROVER, AK
PAL, D
 
Subject FLUX LATTICES
II SUPERCONDUCTORS
ELASTIC THEORY
PEAK
MATTER
DISORDER
BI2SR2CACU2O8
MAGNETIZATION
VORTICES
CRYSTALS
 
Description We present the vortex phase diagram in a weakly pinned single crystal of a low T-c superconductor, Ca3Rh4Sn13 (T-c similar to 8.37 K). We believe that a well ordered Bragg glass phase is sandwiched between the multi-domain vortex glass and an amorphous vortex state in a portion of the field-temperature phase space. From an exploration of the thermal variation of the onset of the non-monotonic variation of the critical current density as fingerprinted by the second magnetization peak (SMP) in the magnetization hysteresis loops, we have sketched a phase boundary akin to the inverse melting phenomenon reported earlier only in samples of high T-c superconductors. We reveal here a step change in the equilibrium magnetization across the SMP and peak effect regions, which is a suggestive feature of the first order phase transition. We have determined a lower field limit (like a spinodal line) of the transition to the vortex glass phase via the identification of the SMP anomaly in the ac susceptibility measurements, where shaking of the vortex matter can facilitate the accession of the underlying equilibrium phase.
 
Publisher IOP PUBLISHING LTD
 
Date 2014-10-17T05:27:18Z
2014-10-17T05:27:18Z
2013
 
Type Article
 
Identifier SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 26(12)
0953-2048
1361-6668
http://dx.doi.org/10.1088/0953-2048/26/12/125016
http://dspace.library.iitb.ac.in/jspui/handle/100/16065
 
Language en