Influence of Antiferromagnetic Fluctuations on the Fulde–Ferrell–Larkin–Ovchinnikov State in CeCoIn5 View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2007-01-24

AUTHORS

M. Nicklas, C. F. Miclea, J. L. Sarrao, J. D. Thompson, G. Sparn, F. Steglich

ABSTRACT

The Fulde–Ferrell–Larkin–Ovchinnikov (FFLO) state is a spatially inhomogeneous superconducting (SC) phase with a periodically modulated order parameter predicted to appear in sufficiently clean type-II superconductors, close to the upper critical field, if the orbital pair breaking is small relative to the Pauli-limiting effect. The heavy-fermion superconductor CeCoIn5 is the first material, where different physical probes show strong experimental evidence pointing to the realization of the FFLO state, even though strong antiferromagnetic (AFM) spin-fluctuations (SF) are present at atmospheric pressure. To study the influence of the AFM-SF on the FFLO state we performed heat-capacity experiments under pressure. We utilized a newly developed miniature piston-cylinder type pressure cell specially suited for measuring small samples at high-magnetic fields and low temperatures (0 GPa ≤ P ≤ 1.5 GPa, 0 kOe ≤ H ≤ 140 kOe, and 100 mK ≤ T ≤ 4 K). We found the second anomaly inside the SC state in CeCoIn5 can still be observed with pressure, which suppress the strong AFM-SF. The FFLO phase extends to higher fields and temperatures on applying pressure while the Pauli-limiting effect is becoming weaker and the SF are suppressed. This reveals the detrimental effect of the AFM-SF on the FFLO phase stability. More... »

PAGES

669-680

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s10909-006-9284-7

DOI

http://dx.doi.org/10.1007/s10909-006-9284-7

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1004995445


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