Superconductivity in LaRh2Sn2
Presented by Mr. Douglas BRITZ on 8 Jul 2014 from 17:10 to 19:00
Type: Poster Presentation
Track: Track A - Division for Physics of Condensed Matter and Materials
Board #: A.307
LaRh2Sn2 crystallizes in the centrosymmetric primitive tetragonal crystal structure P4/mmm (number 123)  commonly referred to as the CaBe2Ge2-type which was confirmed on our synthesized samples by x-ray diffraction. The existence of this superconducting transition was published  and in this study we proceed with an extensive study into the properties of this superconducting ground state using physical property measurements. Electrical resistance and heat capacity measurements reveal a sharp and well defined superconducting transition TSC = 0.70 ± 0.07 K. The low-temperature heat capacity measurements show LaRh2Sn2 to be a weakly coupled  bulk BCS superconductor that has an s-wave singlet ground state with an isotropic energy gap 3.38 ± 0.06 meV. From the field dependence of the electrical resistance the upper critical field was estimated to be 0.127 ± 0.003 T. With the calculated penetration depth and coherence length LaRh2Sn2 is a type-II superconductor which was confirmed with low temperature magnetization measurements. reference  M. Francois et al., J. Less-Common Met. 113, 231 (1985).  A. Strydom and D. Britz, J. Phys. Soc. Jpn. 81, SB018 (2012).  W. L. McMillan, Phys. Rev. 167, 331 (1968).
Prof. A.M. Strydom, UJ