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TT: Fachverband Tiefe Temperaturen
TT 10: Poster Session: Superconductivity
TT 10.30: Poster
Montag, 14. März 2011, 14:00–18:00, P4
Thermodynamic, magnetic and transport properties of Rh17S15 — •M. Uhlarz1, O. Ignatchik1, J. Wosnitza1,2, A. Haase1,2,3, M. Doerr2, R. Daou3, H. Rosner3,4, H.R. Naren5, A. Thamizhavel5, and S. Ramakrishnan5 — 1Hochfeld-Magnetlabor Dresden, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden — 2Institut für Festkörperphysik, TU Dresden, 01069 Dresden — 3Max-Planck-Institut für Chemische Physik fester Stoffe, 01187 Dresden — 4Leibniz-Institut für Festkörper- und Werkstoffforschung, 01069 Dresden — 5Tata Institute of Fundamental Research, Mumbai-400005, India
We determined thermodynamic (specific heat), magnetic (magnetization, magnetostriction and susceptibility) and transport (electrical resistivity) properties of the 4d-electron superconductor Rh17S15 (Tc =5.3 K). The upper critical field is 19.2 T at T =0.07 K. We investigated both a polycrystal and a single crystal. Specific heat gives γ(B=0)=107 mJ/ mol K2, meff=35 m0, and a superconducting energy gap Δ0=0.94 meV. The magnetic properties are dominated by flux-line pinning; resistivity likely reveals an amplification of electron-phonon coupling by weak disorder. Additionally, band-structure calculations are presented and interpreted in the context of our own experiments and other recently published results. We interpret our findings in order to find the origin of the strong electronic correlations in Rh17S15 both in the superconducting and in the normal-conducting state.
Part of this work has been supported by EuroMagNET II under the EU contract no. 228043.