Superconducting and magnetic properties ofSr3Ir4Sn13
| Autor: | Cedomir Petrovic, Anthony A. Amato, Hubertus Luetkens, R. M. Cook, Martin R. Lees, Kefeng Wang, Pabitra Kumar Biswas, Elvezio Morenzoni, Rustem Khasanov |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Physical Review B. 90 |
| ISSN: | 1550-235X 1098-0121 |
| DOI: | 10.1103/physrevb.90.144505 |
| Popis: | Magnetization and muon spin rotation and relaxation ($\ensuremath{\mu}\mathrm{SR}$) measurements have been performed to study the superconducting and magnetic properties of ${\mathrm{Sr}}_{3}{\mathrm{Ir}}_{4}{\mathrm{Sn}}_{13}$. From magnetization measurements the lower and upper critical fields $T=0\phantom{\rule{0.28em}{0ex}}\mathrm{K}$ are found to be 8.5(1) mT and 1.44(2) T, respectively. Zero-field $\ensuremath{\mu}\mathrm{SR}$ data show no sign of any magnetic ordering or weak magnetism. Transverse-field $\ensuremath{\mu}\mathrm{SR}$ measurements in the vortex state provide the temperature dependence of the magnetic penetration depth $\ensuremath{\lambda}$. The temperature dependence of ${\ensuremath{\lambda}}^{\ensuremath{-}2}$ is consistent with the existence of a single $s$-wave energy gap in the superconducting state of ${\mathrm{Sr}}_{3}{\mathrm{Ir}}_{4}{\mathrm{Sn}}_{13}$ with a gap value of 0.82(2) meV at absolute zero temperature. However, a two-gap $s+s$-wave model fit with gap values of 0.91(4) and 0.14(7) meV cannot be ruled out completely. The magnetic penetration depth at zero temperature $\ensuremath{\lambda}(0)$ is 291(3) nm. The ratio $\ensuremath{\Delta}(0)/{k}_{\mathrm{B}}{T}_{\mathrm{c}}=2.1(1)$ indicates that ${\mathrm{Sr}}_{3}{\mathrm{Ir}}_{4}{\mathrm{Sn}}_{13}$ should be considered a strong-coupling superconductor. |
| Databáze: | OpenAIRE |
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