Publication Date:
2015-12-01
Description:
We present a detailed investigation on the doping dependence of the upper critical field H c 2 ( T ) of FeSe x Te 1− x thin films (0.18 ≤ x ≤ 0.90) by measuring the electrical resistivity as a function of magnetic field. The H c 2 ( 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.
Print ISSN:
0003-6951
Electronic ISSN:
1077-3118
Topics:
Physics