Pleiades Publishing
JETP Letters
,  volume 111 ,  issue 7 ,  pages 403-407

Upper Critical Field of a Two-Band SrFe2 − xNixAs2 Superconductor

Publication type: Journal Article
Publication date: 2020-04-01
Pleiades Publishing
scimago Q3
wos Q3
SJR: 0.312
CiteScore: 2.3
Impact factor: 1.3
ISSN: 00213640, 10906487
Physics and Astronomy (miscellaneous)
Abstract
The upper critical field of an iron-based SrFe2 − xNixAs2 superconductor single crystal is measured for the first time in longitudinal and transverse magnetic fields up to 16 T in the basal ab plane and to it along the c axis. The Hc2(0) values are 18 and 25 T for H ∥ c and H ∥ ab, respectively. The anisotropy of the upper critical field γ(T) = Hc2 / Hc2 decreases monotonically to 1.4 with decreasing temperature. The temperature dependence of Hc2 is not described fully by the Werthamer–Helfand–Hohenberg model taking into account the influence of orbital and spin paramagnetic effects. However, an effective two-band model reproduces well the measured temperature dependence. This indicates the two-band nature of this superconductor, where one of the bands is almost isotropic. According to the two-band model approximation, the contribution from the anisotropic band dominates near Tc, whereas the main contribution at low temperatures comes from the isotropic band with a lower diffusion coefficient.
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Maltsev E. I. et al. Upper Critical Field of a Two-Band SrFe2 − xNixAs2 Superconductor // JETP Letters. 2020. Vol. 111. No. 7. pp. 403-407.
GOST all authors (up to 50) Copy
Maltsev E. I., Vlasenko V., Sobolevskii O. A., Sadakov A. V., Massalimov B. I., Pervakov K. Upper Critical Field of a Two-Band SrFe2 − xNixAs2 Superconductor // JETP Letters. 2020. Vol. 111. No. 7. pp. 403-407.
RIS |
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RIS Copy
TY - JOUR
DO - 10.1134/S0021364020070061
UR - https://doi.org/10.1134/S0021364020070061
TI - Upper Critical Field of a Two-Band SrFe2 − xNixAs2 Superconductor
T2 - JETP Letters
AU - Maltsev, E I
AU - Vlasenko, V.A.
AU - Sobolevskii, O A
AU - Sadakov, A. V.
AU - Massalimov, B I
AU - Pervakov, K.S.
PY - 2020
DA - 2020/04/01
PB - Pleiades Publishing
SP - 403-407
IS - 7
VL - 111
SN - 0021-3640
SN - 1090-6487
ER -
BibTex |
Cite this
BibTex (up to 50 authors) Copy
@article{2020_Maltsev,
author = {E I Maltsev and V.A. Vlasenko and O A Sobolevskii and A. V. Sadakov and B I Massalimov and K.S. Pervakov},
title = {Upper Critical Field of a Two-Band SrFe2 − xNixAs2 Superconductor},
journal = {JETP Letters},
year = {2020},
volume = {111},
publisher = {Pleiades Publishing},
month = {apr},
url = {https://doi.org/10.1134/S0021364020070061},
number = {7},
pages = {403--407},
doi = {10.1134/S0021364020070061}
}
MLA
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MLA Copy
Maltsev, E. I., et al. “Upper Critical Field of a Two-Band SrFe2 − xNixAs2 Superconductor.” JETP Letters, vol. 111, no. 7, Apr. 2020, pp. 403-407. https://doi.org/10.1134/S0021364020070061.