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  Heat capacity under pressure of CeCoIn5

Lengyel, E., Borth, R., Pagliuso, P. G., Sarrao, J., Sparn, G., Steglich, F., et al. (2002). Heat capacity under pressure of CeCoIn5. High Pressure Research, 22(1 Sp. Iss. SI), 185-187. doi:10.1080/08957950211369.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-316B-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0000-F70E-B
Genre: Journal Article

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 Creators:
Lengyel, E.1, Author              
Borth, R.1, Author              
Pagliuso, P. G., Author
Sarrao, J., Author
Sparn, G.2, Author              
Steglich, F.3, Author              
Thompson, J. D., Author
Affiliations:
1Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
2Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              
3Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863467              

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Free keywords: heavy fermion; superconductivity; heat capacity; pressure
 Abstract: Among heavy-fermion (HF) superconductors, CeCoIn5 exhibits a record high value of T-c = 2.3 K at ambient pressure [1]. CeCoIn5 belongs to a new class of HF-superconductors that crystallize in the tetragonal HoCoGa5-structure. This structure can be regarded as alternating layers of CeIn3 and CoIn2. Bulk CeIn3 undergoes a transition from an antiferromagnetic (AFM) state at ambient pressure (T-N = 10.2 K) to a superconducting state with very low T-C = 0.15 K at a critical pressure p(c) = 2.8 GPa [2] at which long range magnetic order vanishes. It is, therefore, regarded as a possible candidate for magnetically mediated superconductivity (SC). We report on measurements of the heat capacity of CeCoIn5 at hydrostatic pressures p less than or equal to 1.5 GPa. While T-c increases with increasing pressure, the effective mass of the quasi-particles m(eff) decreases, as indicated by the ratio C/T\(Tc). As a working hypothesis based on theories of a nearly antiferromagnetic Fermi-liquid (NAFFL), this may be interpreted as the stabilization of the superconducting state by an increase of the characteristic spin fluctuation temperature T-SF (T-SF proportional tok(F)(2)/m(eff)).

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Language(s): eng - English
 Dates: 2002-04
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 17788
ISI: 000176798900040
DOI: 10.1080/08957950211369
 Degree: -

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Title: High Pressure Research
  Alternative Title : High Pressure Res.
Source Genre: Journal
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Publ. Info: -
Pages: - Volume / Issue: 22 (1 Sp. Iss. SI) Sequence Number: - Start / End Page: 185 - 187 Identifier: ISSN: 0895-7959