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18 April 2024 |
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KFe2As2: coexistence of superconductivity and local moment derived spin-glass | | V. Grinenko
; M. Abdel-Hafiez
; S. Aswartham
; A. U. B. Wolter-Giraud
; C. Hess
; M. Kumar
; S. Wurmehl
; K. Nenkov
; G. Fuchs
; B. Holzapfel
; S.-L. Drechsler
; B. Buechner
; | | Date: |
7 Mar 2012 | | Abstract: | High-quality KFe2As2 single crystals have been studied by transport,
magnetization and low-T specific heat measurements. Their analysis shows that
superconductivity occurs (in some cases coexists) in the vicinity of disordered
magnetic phases (Griffiths and spin-glass type) depending of the amount of
local magnetic moments (probably excess Fe derived)and sample inhomogeneity.
The achieved phenomenological description of our data including also data from
the literature provides a consistent explanation of the observed
non-Fermi-liquid behavior and of the nominally large experimental Sommerfeld
coefficient gamma_n about 94 mJ/mol K^2. We suggest that the intrinsic value
(directly related to the itinerant quasi-particles) gamma_el about 60(10)mJ/mol
K^2 is significantly reduced compared with gamma_n. Then an enhanced relative
jump of the electronic specific heat Delta C_el/gamma_el T_c about 0.8 and a
weak total electron-boson coupling constant lambda less or about 1 follow. | | Source: | arXiv, 1203.1585 | | Services: | Forum | Review | PDF | Favorites | |
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