Penetration depth study of LaOs4Sb12 : multiband s-wave superconductivity

Penetration depth study of LaOs4Sb12 : multiband s-wave superconductivity

We measured the magnetic penetration depth λ(T) in single crystals of LaOs4Sb12 (Tc=0.74 K) down to 85 mK using a tunnel-diode-oscillator technique. The observed low-temperature exponential dependence indicates an s-wave gap. Fitting the low-temperature data to a BCS s-wave expression gives the zero...

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Bibliographic Details
Main Authors: Panagopoulos, Christos, Tee, X. Y., Luo, H. G., Xiang, T., Vandervelde, D., Salamon, M. B., Sugawara, H., Sato, H., Chia, Elbert E. M.
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2013
Subjects:
DRNTU::Science::Physics::Electricity and magnetism
Online Access:https://hdl.handle.net/10356/95111
http://hdl.handle.net/10220/9243
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Institution: Nanyang Technological University
Language: English
Description
Summary:We measured the magnetic penetration depth λ(T) in single crystals of LaOs4Sb12 (Tc=0.74 K) down to 85 mK using a tunnel-diode-oscillator technique. The observed low-temperature exponential dependence indicates an s-wave gap. Fitting the low-temperature data to a BCS s-wave expression gives the zero-temperature gap value Δ(0)=(1.34±0.07)kBTc which is significantly smaller than the BCS value of 1.76kBTc. In addition, the normalized superfluid density ρ(T) shows an unusually long suppression near Tc and is best fit by a two-band s-wave model.

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