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Anomalous peak effect in heavy‐fermion, intermediate‐valence and A15 superconductors: Evidence for a Fulde‐Ferrell‐Larkin‐Ovchinnikov state?
Author(s) -
Gegenwart P.,
Deppe M.,
Köppen M.,
Kromer F.,
Lang M.,
Modler R.,
Weiden M.,
Geibel C.,
Steglich F.,
Fukase T.,
Toyota N.
Publication year - 1996
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.2065080402
Subject(s) - physics , superconductivity , condensed matter physics , pauli exclusion principle , valence (chemistry) , heavy fermion , heavy fermion superconductor , fermion , order (exchange) , quantum mechanics , finance , economics
An experimental study based upon magnetic and dilatometric measurements is presented for the clean high‐κ superconductors UPd 2 Al 3 , CeRu 2 and V 3 Si. All three compounds show an enhanced spin susceptibility. Their superconducting state is strongly Pauli limited, and an anomalous peak effect is observed at T<(0.8‐0.9)T c , slightly below H c2 (T). This phenomenon appears to be qualitatively consistent with a first‐order transition between weak and collective pinning, caused by the formation of a staggered order parameter in a generalized Fulde‐Ferrell‐Larkin‐Ovchinnikov phase (M. Tachiki et al., Z. Phys. B, in press).