Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 30: Superconductivity - Poster Session

TT 30.17: Poster

Montag, 31. März 2014, 15:00–19:00, P2

¹¹⁹Sn NMR investigations on superconducting Ca₃Ir₄Sn₁₃ — •Rajib Sarkar¹, Felix Brueckner¹, Marco Günter¹, Cedomir Petrovic², Kefeng Wang², Hubertus Luetkens³, Pabitra Biswas³, Elvezio Morenzoni³, Alex Amato³, and Hans-Henning Klauss¹ — ¹IFP, TU Dresden, D-01069 Dresden, Germany — ²CMPMS, BNL, Upton, NY-11973, USA — ³PSI, CH-5232 Villigen PSI, Switzerland

Ca₃Ir₄Sn₁₃ was found to exhibit superconducting transition with T_c ≈ 7 K. It received considerable attention due to the possible coexistence of superconductivity and ferromagnetic spin fluctuation as well as the three-dimensional charge density wave (CDW) from the superlattice transition. [1,2] While thermal, transport, and thermodynamic characterization of Ca₃Ir₄Sn₁₃ single crystals suggest that it is a weakly correlated nodeless superconductor, recent µSR investigation reveals that the electron-phonon pairing interaction is in the strong-coupling limit. Here we present ¹¹⁹Sn NMR investigations on Ca₃Ir₄Sn₁₃ polycrystalline samples and discuss the symmetry of the superconducting order parameter together with the normal state properties. Our preliminary results of spin-lattice relaxation rate (1/T₁) indicate that this is a BCS superconductor with weak-coupling limit.
J. Phys. Soc. Jpn. 19, 113705 (2010).
Phys. Rev. Lett. 109, 237008 (2012).