Inversion of the upper critical field anisotropy in FeTeS films

B. Maiorov; P. Mele; S. A. Baily; M. Weigand; S. Z. Lin; F. F. Balakirev; K. Matsumoto; H. Nagayoshi; S. Fujita; Y. Yoshida; Y. Ichino; T. Kiss; A. Ichinose; M. Mukaida; L. Civale

doi:10.1088/0953-2048/27/4/044005

Inversion of the upper critical field anisotropy in FeTeS films

B. Maiorov, P. Mele, S. A. Baily, M. Weigand, S. Z. Lin, F. F. Balakirev, K. Matsumoto, H. Nagayoshi, S. Fujita, Y. Yoshida, Y. Ichino, T. Kiss, A. Ichinose, M. Mukaida, L. Civale

Section of Measurement and Control Engineering

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

We present the complete superconducting upper critical field (H _c2) - temperature (T) diagram of FeTeS films measured at three crystalline orientations (H ∥ c, 45^° and ab). We find that H_c2 is almost isotropic in magnetic field orientation with μ₀H_c2 (T = 0) ∼ 30 T and a transition temperature of T_c ∼ 7 K. A small but clear H_c2 angular anisotropy is observed, with a crossover around T = 0.7T_c, from H_c2 (∥ c) < H_c2 (∥ ab) for T > 0.7T_c to H _c2 (∥ c) > H_c2 (∥ ab) for T < 0.7T _c. This change in the anisotropy is similar to that observed in FeTeS and FeTeSe single crystals but occurs at a higher T/T_c for our film. We analyze the H_c2 (T) in terms of pair-breaking mechanisms and two-band superconductor theory. Understanding the inversion of H_c2 opens the possibility to adjust the effective anisotropy of superconductors for different applications.

Original language	English
Article number	044005
Journal	Superconductor Science and Technology
Volume	27
Issue number	4
DOIs	https://doi.org/10.1088/0953-2048/27/4/044005
Publication status	Published - Apr 2014

All Science Journal Classification (ASJC) codes

Ceramics and Composites
Condensed Matter Physics
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

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10.1088/0953-2048/27/4/044005

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Maiorov, B., Mele, P., Baily, S. A., Weigand, M., Lin, S. Z., Balakirev, F. F., Matsumoto, K., Nagayoshi, H., Fujita, S., Yoshida, Y., Ichino, Y., Kiss, T., Ichinose, A., Mukaida, M., & Civale, L. (2014). Inversion of the upper critical field anisotropy in FeTeS films. Superconductor Science and Technology, 27(4), Article 044005. https://doi.org/10.1088/0953-2048/27/4/044005

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title = "Inversion of the upper critical field anisotropy in FeTeS films",

abstract = "We present the complete superconducting upper critical field (H c2) - temperature (T) diagram of FeTeS films measured at three crystalline orientations (H ∥ c, 45° and ab). We find that Hc2 is almost isotropic in magnetic field orientation with μ0Hc2 (T = 0) ∼ 30 T and a transition temperature of Tc ∼ 7 K. A small but clear Hc2 angular anisotropy is observed, with a crossover around T = 0.7Tc, from Hc2 (∥ c) < Hc2 (∥ ab) for T > 0.7Tc to H c2 (∥ c) > Hc2 (∥ ab) for T < 0.7T c. This change in the anisotropy is similar to that observed in FeTeS and FeTeSe single crystals but occurs at a higher T/Tc for our film. We analyze the Hc2 (T) in terms of pair-breaking mechanisms and two-band superconductor theory. Understanding the inversion of Hc2 opens the possibility to adjust the effective anisotropy of superconductors for different applications.",

author = "B. Maiorov and P. Mele and Baily, {S. A.} and M. Weigand and Lin, {S. Z.} and Balakirev, {F. F.} and K. Matsumoto and H. Nagayoshi and S. Fujita and Y. Yoshida and Y. Ichino and T. Kiss and A. Ichinose and M. Mukaida and L. Civale",

note = "Funding Information: advice and encouragement during the progressofthiswork.E. Rojas,andP. Lebrun for their Joel Keizer is supported by National Institutes of Health GM 30688-03 PCM8215583.andTeresaRee Chay is supported by the National Science Foundation",

year = "2014",

month = apr,

doi = "10.1088/0953-2048/27/4/044005",

language = "English",

volume = "27",

journal = "Superconductor Science and Technology",

issn = "0953-2048",

publisher = "IOP Publishing Ltd.",

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TY - JOUR

T1 - Inversion of the upper critical field anisotropy in FeTeS films

AU - Maiorov, B.

AU - Mele, P.

AU - Baily, S. A.

AU - Weigand, M.

AU - Lin, S. Z.

AU - Balakirev, F. F.

AU - Matsumoto, K.

AU - Nagayoshi, H.

AU - Fujita, S.

AU - Yoshida, Y.

AU - Ichino, Y.

AU - Kiss, T.

AU - Ichinose, A.

AU - Mukaida, M.

AU - Civale, L.

N1 - Funding Information: advice and encouragement during the progressofthiswork.E. Rojas,andP. Lebrun for their Joel Keizer is supported by National Institutes of Health GM 30688-03 PCM8215583.andTeresaRee Chay is supported by the National Science Foundation

PY - 2014/4

Y1 - 2014/4

N2 - We present the complete superconducting upper critical field (H c2) - temperature (T) diagram of FeTeS films measured at three crystalline orientations (H ∥ c, 45° and ab). We find that Hc2 is almost isotropic in magnetic field orientation with μ0Hc2 (T = 0) ∼ 30 T and a transition temperature of Tc ∼ 7 K. A small but clear Hc2 angular anisotropy is observed, with a crossover around T = 0.7Tc, from Hc2 (∥ c) < Hc2 (∥ ab) for T > 0.7Tc to H c2 (∥ c) > Hc2 (∥ ab) for T < 0.7T c. This change in the anisotropy is similar to that observed in FeTeS and FeTeSe single crystals but occurs at a higher T/Tc for our film. We analyze the Hc2 (T) in terms of pair-breaking mechanisms and two-band superconductor theory. Understanding the inversion of Hc2 opens the possibility to adjust the effective anisotropy of superconductors for different applications.

AB - We present the complete superconducting upper critical field (H c2) - temperature (T) diagram of FeTeS films measured at three crystalline orientations (H ∥ c, 45° and ab). We find that Hc2 is almost isotropic in magnetic field orientation with μ0Hc2 (T = 0) ∼ 30 T and a transition temperature of Tc ∼ 7 K. A small but clear Hc2 angular anisotropy is observed, with a crossover around T = 0.7Tc, from Hc2 (∥ c) < Hc2 (∥ ab) for T > 0.7Tc to H c2 (∥ c) > Hc2 (∥ ab) for T < 0.7T c. This change in the anisotropy is similar to that observed in FeTeS and FeTeSe single crystals but occurs at a higher T/Tc for our film. We analyze the Hc2 (T) in terms of pair-breaking mechanisms and two-band superconductor theory. Understanding the inversion of Hc2 opens the possibility to adjust the effective anisotropy of superconductors for different applications.

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JO - Superconductor Science and Technology

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Inversion of the upper critical field anisotropy in FeTeS films

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