Pauli-limited effect in the magnetic phase diagram of FeSe{sub x}Te{sub 1−x} thin films

We present a detailed investigation on the doping dependence of the upper critical field H{sub c2}(T) of FeSe{sub x}Te{sub 1−x} thin films (0.18 ≤ x ≤ 0.90) by measuring the electrical resistivity as a function of magnetic field. The H{sub c2}(T) curves exhibit a downturn behavior with decreasing te...

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Bibliographic Details
Published in:Applied physics letters 2015-11, Vol.107 (22)
Main Authors: Zhuang, J. C., Li, Z., Xu, X., Wang, L., Yeoh, W. K., Wang, X. L., Du, Y., Dou, S. X., Xing, X. Z., Shi, Z. X.
Format: Article
Language:English
Subjects:
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CRITICAL FIELD
ELECTRIC CONDUCTIVITY
IRON SELENIDES
PARAMAGNETISM
PHASE DIAGRAMS
SPIN
THIN FILMS
VARIATIONS
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Summary:We present a detailed investigation on the doping dependence of the upper critical field H{sub c2}(T) of FeSe{sub x}Te{sub 1−x} thin films (0.18 ≤ x ≤ 0.90) by measuring the electrical resistivity as a function of magnetic field. The H{sub c2}(T) curves exhibit a downturn behavior with decreasing temperature in all the samples, owing to the Pauli-limited effect (spin paramagnetic effect). The Pauli-limited effect on the upper critical field can be monotonically modulated by variation of the Se/Te composition. Our results show that Te-doping induced disorder and excess Fe atoms give rise to enhancement of the Pauli-limited effect.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4936848