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  Pressure studies of the unconventional superconductors CeTIn5 (T : Co, Ir)

Sparn, G., Borth, R., Lengyel, E., Pagliuso, P. G., Sarrao, J., Steglich, F., et al. (2002). Pressure studies of the unconventional superconductors CeTIn5 (T: Co, Ir). High Pressure Research, 22(1 Sp. Iss. SI), 163-165. doi:10.1080/08957950211342.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-3171-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0000-F707-2
Genre: Journal Article

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 Creators:
Sparn, G.1, Author              
Borth, R.2, Author              
Lengyel, E.2, Author              
Pagliuso, P. G., Author
Sarrao, J., Author
Steglich, F.3, Author              
Thompson, J. D., Author
Affiliations:
1Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
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: In the quest for new superconductor compounds which adopt the superconducting state at increasingly higher transition temperatures T-c, a non-phonon mediated coupling between the charge carriers seems to play a key role. In order to enhance our understanding of such unconventional coupling mechanisms, we studied a new family of heavy fermion (HF) superconductors CeTIn5 (T: transition metal) whose properties point toward the realization of unconventional superconductivity (SC): the specific beat, thermal conductivity and nuclear spin-lattice relaxation rate of CeIrIn5 and CeCoIn5 decrease as a power law of temperature instead of exponentially for T < T-c. We report on measurements of the heat capacity of CeIrIn5 and CeCoIn5 at hydrostatic pressures p less than or equal to 1.6 GPa. In both compounds, T. increases with increasing pressure, while the 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 to k(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: 18509
ISI: 000176798900035
DOI: 10.1080/08957950211342
 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: 163 - 165 Identifier: ISSN: 0895-7959