Measurements of the superconducting anisotropy in FeSe with a resonance frequency technique

R. X. Cao; Jun Dong; Q. L. Wang; Y. J. Yang; C. Zhao; X. H. Zeng; D. A. Chareev; A. N. Vasiliev; Bing Wu; Guoqing Wu

doi:10.1063/1.5093591

Measurements of the superconducting anisotropy in FeSe with a resonance frequency technique

R. X. Cao
, Jun Dong
, Q. L. Wang
, Y. J. Yang
, C. Zhao
, X. H. Zeng
, D. A. Chareev
, A. N. Vasiliev
, Bing Wu
, Guoqing Wu

School of Electrical Engineering

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

7 Scopus citations

Abstract

Utilizing a novel method with the resonance frequency of a LC circuit, we measured the superconducting anisotropy of single crystals of an Fe-based superconductor FeSe with applied magnetic field up to 16 T. We found that the temperature dependence of the upper critical field H_c2(T) of FeSe coincides with the Werthamer-Helfand-Hohenberg (WHH) model when taking the Maki parameter α into consideration, suggesting an important role played by spin-paramagnetic effect in suppressing the superconductivity. When temperature T → 0, the values of H_c2,≈c(0) and H_c2,≈ab(0) derived from the WHH fitting are close to and fall within the range of the Pauli limit, for field H₀ applied parallel to the c-axis and to the ab-plane, respectively. As compared with other typical iron-based high-T_c superconductors, lower values of H_c2(0) and higher superconducting anisotropy Γ(0) were observed in FeSe.

Original language	English
Article number	0452201
Journal	AIP Advances
Volume	9
Issue number	4
DOIs	https://doi.org/10.1063/1.5093591
State	Published - 1 Apr 2019

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title = "Measurements of the superconducting anisotropy in FeSe with a resonance frequency technique",

abstract = "Utilizing a novel method with the resonance frequency of a LC circuit, we measured the superconducting anisotropy of single crystals of an Fe-based superconductor FeSe with applied magnetic field up to 16 T. We found that the temperature dependence of the upper critical field Hc2(T) of FeSe coincides with the Werthamer-Helfand-Hohenberg (WHH) model when taking the Maki parameter α into consideration, suggesting an important role played by spin-paramagnetic effect in suppressing the superconductivity. When temperature T → 0, the values of Hc2,≈c(0) and Hc2,≈ab(0) derived from the WHH fitting are close to and fall within the range of the Pauli limit, for field H0 applied parallel to the c-axis and to the ab-plane, respectively. As compared with other typical iron-based high-Tc superconductors, lower values of Hc2(0) and higher superconducting anisotropy Γ(0) were observed in FeSe.",

author = "Cao, \{R. X.\} and Jun Dong and Wang, \{Q. L.\} and Yang, \{Y. J.\} and C. Zhao and Zeng, \{X. H.\} and Chareev, \{D. A.\} and Vasiliev, \{A. N.\} and Bing Wu and Guoqing Wu",

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doi = "10.1063/1.5093591",

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T1 - Measurements of the superconducting anisotropy in FeSe with a resonance frequency technique

AU - Cao, R. X.

AU - Dong, Jun

AU - Wang, Q. L.

AU - Yang, Y. J.

AU - Zhao, C.

AU - Zeng, X. H.

AU - Chareev, D. A.

AU - Vasiliev, A. N.

AU - Wu, Bing

AU - Wu, Guoqing

PY - 2019/4/1

Y1 - 2019/4/1

N2 - Utilizing a novel method with the resonance frequency of a LC circuit, we measured the superconducting anisotropy of single crystals of an Fe-based superconductor FeSe with applied magnetic field up to 16 T. We found that the temperature dependence of the upper critical field Hc2(T) of FeSe coincides with the Werthamer-Helfand-Hohenberg (WHH) model when taking the Maki parameter α into consideration, suggesting an important role played by spin-paramagnetic effect in suppressing the superconductivity. When temperature T → 0, the values of Hc2,≈c(0) and Hc2,≈ab(0) derived from the WHH fitting are close to and fall within the range of the Pauli limit, for field H0 applied parallel to the c-axis and to the ab-plane, respectively. As compared with other typical iron-based high-Tc superconductors, lower values of Hc2(0) and higher superconducting anisotropy Γ(0) were observed in FeSe.

AB - Utilizing a novel method with the resonance frequency of a LC circuit, we measured the superconducting anisotropy of single crystals of an Fe-based superconductor FeSe with applied magnetic field up to 16 T. We found that the temperature dependence of the upper critical field Hc2(T) of FeSe coincides with the Werthamer-Helfand-Hohenberg (WHH) model when taking the Maki parameter α into consideration, suggesting an important role played by spin-paramagnetic effect in suppressing the superconductivity. When temperature T → 0, the values of Hc2,≈c(0) and Hc2,≈ab(0) derived from the WHH fitting are close to and fall within the range of the Pauli limit, for field H0 applied parallel to the c-axis and to the ab-plane, respectively. As compared with other typical iron-based high-Tc superconductors, lower values of Hc2(0) and higher superconducting anisotropy Γ(0) were observed in FeSe.

UR - https://www.scopus.com/pages/publications/85065623328

U2 - 10.1063/1.5093591

DO - 10.1063/1.5093591

M3 - 文章

AN - SCOPUS:85065623328

SN - 2158-3226

VL - 9

JO - AIP Advances

JF - AIP Advances

IS - 4

M1 - 0452201

ER -

Measurements of the superconducting anisotropy in FeSe with a resonance frequency technique

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