In:
Chinese Physics Letters, IOP Publishing, Vol. 41, No. 4 ( 2024-04-01), p. 047402-
Abstract:
We report on soft c -axis point-contact Andreev reflection (PCAR) spectroscopy combining with resistivity measurements on BaFe 2 (As 0.7 P 0.3 ) 2 , to elucidate the superconducting gap structure in the vicinity of the quantum critical point. A double peak at the gap edge plus a dip feature at zero-bias has been observed on the PCAR spectra, indicative of the presence of a nodeless gap in BaFe 2 (As 0.7 P 0.3 ) 2 . Detailed analysis within a sophisticated theoretical model reveals an anisotropic gap with deep gap minima. The PCARs also feature additional structures related to the electron–bosonic coupling mode. Using the extracted superconducting energy gap value, a characteristic bosonic energy Ω b and its temperature dependence are obtained, comparable with the spin-resonance energy observed in neutron scattering experiment. These results indicate a magnetism-driven quantum critical point in the BaFe 2 (As 1− x P x ) 2 system.
Type of Medium:
Online Resource
ISSN:
0256-307X
,
1741-3540
DOI:
10.1088/0256-307X/41/4/047402
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
2024
detail.hit.zdb_id:
2040565-0
SSG:
6,25
Permalink