Anisotropic upper critical field and possible Fulde-Ferrel-Larkin- Ovchinnikov state in the stoichiometric pnictide superconductor LiFeAs

K. Cho; H. Kim; M. A. Tanatar; Y. J. Song; Y. S. Kwon; W. A. Coniglio; C. C. Agosta; A. Gurevich; R. Prozorov

doi:10.1103/PhysRevB.83.060502

Anisotropic upper critical field and possible Fulde-Ferrel-Larkin- Ovchinnikov state in the stoichiometric pnictide superconductor LiFeAs

K. Cho, H. Kim, M. A. Tanatar, Y. J. Song, Y. S. Kwon, W. A. Coniglio, C. C. Agosta, A. Gurevich, R. Prozorov

Department of Physics and Chemistry

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Abstract

Measurements of the temperature and angular dependencies of the upper critical field H_c2 of a stoichiometric single crystal LiFeAs in pulsed magnetic fields up to 50 T were performed using a tunnel diode resonator. Complete Hc(T) and Hc2(T) functions with Hc(0)=17±1 T, Hc2(0)=26±1 T, and the anisotropy parameter γ_H(T)Hc2/Hc decreasing from 2.5 at T_c to 1.5 at TT_c were obtained. The results for both orientations are in excellent agreement with a theory of H_c2 for two-band s^± pairing in the clean limit. We show that Hc(T) is mostly limited by the orbital pair breaking, whereas the shape of Hc2(T) indicates strong paramagnetic Pauli limiting and the inhomogeneous Fulde-Ferrel-Larkin-Ovchinnikov state below T_F~5 K.

Original language	English
Article number	060502
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	83
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevB.83.060502
State	Published - 11 Feb 2011

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Cho, K., Kim, H., Tanatar, M. A., Song, Y. J., Kwon, Y. S., Coniglio, W. A., Agosta, C. C., Gurevich, A., & Prozorov, R. (2011). Anisotropic upper critical field and possible Fulde-Ferrel-Larkin- Ovchinnikov state in the stoichiometric pnictide superconductor LiFeAs. Physical Review B - Condensed Matter and Materials Physics, 83(6), Article 060502. https://doi.org/10.1103/PhysRevB.83.060502

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title = "Anisotropic upper critical field and possible Fulde-Ferrel-Larkin- Ovchinnikov state in the stoichiometric pnictide superconductor LiFeAs",

abstract = "Measurements of the temperature and angular dependencies of the upper critical field Hc2 of a stoichiometric single crystal LiFeAs in pulsed magnetic fields up to 50 T were performed using a tunnel diode resonator. Complete Hc(T) and Hc2(T) functions with Hc(0)=17±1 T, Hc2(0)=26±1 T, and the anisotropy parameter γH(T)Hc2/Hc decreasing from 2.5 at Tc to 1.5 at TTc were obtained. The results for both orientations are in excellent agreement with a theory of Hc2 for two-band s± pairing in the clean limit. We show that Hc(T) is mostly limited by the orbital pair breaking, whereas the shape of Hc2(T) indicates strong paramagnetic Pauli limiting and the inhomogeneous Fulde-Ferrel-Larkin-Ovchinnikov state below TF~5 K.",

author = "K. Cho and H. Kim and Tanatar, {M. A.} and Song, {Y. J.} and Kwon, {Y. S.} and Coniglio, {W. A.} and Agosta, {C. C.} and A. Gurevich and R. Prozorov",

year = "2011",

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doi = "10.1103/PhysRevB.83.060502",

language = "English",

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Cho, K, Kim, H, Tanatar, MA, Song, YJ, Kwon, YS, Coniglio, WA, Agosta, CC, Gurevich, A & Prozorov, R 2011, 'Anisotropic upper critical field and possible Fulde-Ferrel-Larkin- Ovchinnikov state in the stoichiometric pnictide superconductor LiFeAs', Physical Review B - Condensed Matter and Materials Physics, vol. 83, no. 6, 060502. https://doi.org/10.1103/PhysRevB.83.060502

TY - JOUR

T1 - Anisotropic upper critical field and possible Fulde-Ferrel-Larkin- Ovchinnikov state in the stoichiometric pnictide superconductor LiFeAs

AU - Cho, K.

AU - Kim, H.

AU - Tanatar, M. A.

AU - Song, Y. J.

AU - Kwon, Y. S.

AU - Coniglio, W. A.

AU - Agosta, C. C.

AU - Gurevich, A.

AU - Prozorov, R.

PY - 2011/2/11

Y1 - 2011/2/11

N2 - Measurements of the temperature and angular dependencies of the upper critical field Hc2 of a stoichiometric single crystal LiFeAs in pulsed magnetic fields up to 50 T were performed using a tunnel diode resonator. Complete Hc(T) and Hc2(T) functions with Hc(0)=17±1 T, Hc2(0)=26±1 T, and the anisotropy parameter γH(T)Hc2/Hc decreasing from 2.5 at Tc to 1.5 at TTc were obtained. The results for both orientations are in excellent agreement with a theory of Hc2 for two-band s± pairing in the clean limit. We show that Hc(T) is mostly limited by the orbital pair breaking, whereas the shape of Hc2(T) indicates strong paramagnetic Pauli limiting and the inhomogeneous Fulde-Ferrel-Larkin-Ovchinnikov state below TF~5 K.

AB - Measurements of the temperature and angular dependencies of the upper critical field Hc2 of a stoichiometric single crystal LiFeAs in pulsed magnetic fields up to 50 T were performed using a tunnel diode resonator. Complete Hc(T) and Hc2(T) functions with Hc(0)=17±1 T, Hc2(0)=26±1 T, and the anisotropy parameter γH(T)Hc2/Hc decreasing from 2.5 at Tc to 1.5 at TTc were obtained. The results for both orientations are in excellent agreement with a theory of Hc2 for two-band s± pairing in the clean limit. We show that Hc(T) is mostly limited by the orbital pair breaking, whereas the shape of Hc2(T) indicates strong paramagnetic Pauli limiting and the inhomogeneous Fulde-Ferrel-Larkin-Ovchinnikov state below TF~5 K.

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JO - Physical Review B - Condensed Matter and Materials Physics

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Anisotropic upper critical field and possible Fulde-Ferrel-Larkin- Ovchinnikov state in the stoichiometric pnictide superconductor LiFeAs

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