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Unusual microwave response and bulk conductivity of very thin FeSe0.3Te0.7 films as a function of temperature

Barannik, A. A., Cherpak, N. T., Kharchenko, M. S., Wu, Yun, Luo, Sheng, He, Yusheng and Porch, Adrian 2014. Unusual microwave response and bulk conductivity of very thin FeSe0.3Te0.7 films as a function of temperature. Low Temperature Physics 40 (6) , p. 492. 10.1063/1.4881178

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Abstract

Results of X-band microwave surface impedance measurements of FeSe1− x Te x very thin film are reported. The effective surface resistance shows appearance of peak at T ≤ Tc when plotted as a function of temperature. The authors suggests that the most well-reasoned explanation can be based on the idea of the changing orientation of the microwave magnetic field at a S–N phase transition near the surface of a very thin film. The magnetic penetration depth exhibits a power-law behavior of δλ L (T) ∝ CT n , with an exponent n ≈ 2.4 at low temperatures, which is noticeably higher than in the published results on FeSe1 − x Te x single crystal. However the temperature dependence of the superfluid conductivity remains very different from the behavior described by the BCS theory. Experimental results are fitted very well by a two-gap model with Δ1/kTc = 0.43 and Δ2/kTc = 1.22, thus supporting s ±-wave symmetry. The rapid increase of the quasiparticle scattering time is obtained from the microwave impedance measurements.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Publisher: American Institute of Physics
ISSN: 1063-777X
Last Modified: 21 Feb 2019 12:11
URI: http://orca-mwe.cf.ac.uk/id/eprint/64261

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