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Weakly pinned R₃Rh₄Sn₁₃; thermomagnetic history effects; peak effect; amorphization of flux line lattice; order-disorder transition

A comparative study of the thermomagnetic memory effects of J_c in two weakly pinned low T_c superconductors, Ca₃Rh₄Sn₁₃ (CaRhSn) and Yb₃Rh₄Sn₁₃ (YbRhSn), is presented. In both the systems, the peak effect (PE) phenomenon appears as an order-disorder transformation through stepwise amorphization of the flux line lattice (FLL). However, in CaRhSn. we can witness another disorder-driven transition (Bragg glass (BG) to a vortex glass (VG) in a distinct manner as in a single crystal of high T_c YBa₂Cu₃O_7-δ for H‖c.

S Sarkar¹ S Ramakrishnan¹ AK Grover¹ CV Tomy² G Balakrishnan³ D McK Paul³

1. Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai - 400 005, India
2. Department of Physics, Indian Institute of Technology, Powai, Mumbai - 400 076, India
3. Department of Physics, University of Warwick, Coventry - CV4 7AL, UK

Published

6 May 2002