Penetration depth study of LaOs$_4$Sb$_{12}$: Multiband s-wave superconductivity

X. Y. Tee; H. G. Luo; T. Xiang; D. Vandervelde; M. B. Salamon; H. Sugawara; H. Sato; C. Panagopoulos; Elbert E. M. Chia

doi:10.1103/PhysRevB.86.064518

Penetration depth study of LaOs$_4$Sb$_{12}$: Multiband s-wave superconductivity

Superconductivity 2015-06-05 v1 Strongly Correlated Electrons

Authors: X. Y. Tee , H. G. Luo , T. Xiang , D. Vandervelde , M. B. Salamon , H. Sugawara , H. Sato , C. Panagopoulos , Elbert E. M. Chia

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Abstract

We measured the magnetic penetration depth $\lambda(T)$ in single crystals of LaOs $_{4}$ Sb $_{12}$ ( $T_c$ =0.74 K) down to 85 mK using a tunnel diode oscillator technique. The observed low-temperature exponential dependence indicates a s-wave gap. Fitting the low temperature data to BCS s-wave expression gives the zero temperature gap value $\Delta (0)= (1.34 \pm 0.07) k_B T_c$ which is significantly smaller than the BCS value of 1.76 $k_B T_c$ . In addition, the normalized superfluid density $\rho(T)$ shows an unusually long suppression near $T_c$ , and are best fit by a two-band s-wave model.

Keywords

penetration depth multiband superconductivity s-wave gap superfluid density LaOs4Sb12 BCS theory tunnel diode oscillator

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@article{arxiv.1206.2091,
  title  = {Penetration depth study of LaOs$_4$Sb$_{12}$: Multiband s-wave superconductivity},
  author = {X. Y. Tee and H. G. Luo and T. Xiang and D. Vandervelde and M. B. Salamon and H. Sugawara and H. Sato and C. Panagopoulos and Elbert E. M. Chia},
  journal= {arXiv preprint arXiv:1206.2091},
  year   = {2015}
}

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5 pages, 2 figures

Penetration depth study of LaOs$_4$Sb$_{12}$: Multiband s-wave superconductivity

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