In:
Chinese Physics Letters, IOP Publishing, Vol. 37, No. 12 ( 2020-12-01), p. 127401-
Abstract:
We report an in-depth investigation on the out-of-plane lower critical field H c1 of the KCa 2 (Fe 1− x Co x ) 4 As 4 F 2 (12442-type, x = 0, 0.1). The multi-gap feature is revealed by the kink in the temperature-dependent H c1 ( T ) curve for the two samples with different doping levels. Based on a simplified two-gap model, the magnitudes of the two gaps are determined to be Δ 1 = 1.2 meV and Δ 2 = 5.0 meV for the sample with x = 0, Δ 1 = 0.86 meV and Δ 2 = 2.8 meV for that with x = 0.1. With the cobalt doping, the ratio of energy gap to critical transition temperature ( Δ / k B T c ) remains almost unchanged for the smaller gap and is suppressed by 20% for the larger gap. For the undoped KCa 2 Fe 4 As 4 F 2 , the obtained gap sizes are generally consistent with the results of angle-resolved photoemission spectroscopy experiments.
Type of Medium:
Online Resource
ISSN:
0256-307X
,
1741-3540
DOI:
10.1088/0256-307X/37/12/127401
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
2020
detail.hit.zdb_id:
2040565-0
SSG:
6,25
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