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  Effect of pressure on unconventional superconductivity in CeCoIn5

Sparn, G., Borth, R., Lengyel, E., Pagliuso, P. G., Sarrao, J. L., Steglich, F., et al. (2002). Effect of pressure on unconventional superconductivity in CeCoIn5. Physica B, 312, 138-139. doi:10.1016/S0921-4526(01)01090-0.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-319D-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0000-F70A-F
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. L., 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 superconductor; heat capacity; hydrostatic pressure
 Abstract: Studies of a new family of heavy fermion (HE) superconductors CeMIn5 (M: transition metal) point toward the realization of unconventional superconductivity (SC): the specific heat, 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 CeCoIn5 at hydrostatic pressures pless than or equal to1.5 GPa. In this compound, T-c increases with increasing pressure, while the effective mass of the quasi- particles m(eff) decreases, as indicated by the ratio C/T (Tgreater than or equal toT(c)). As a working hypothesis, this may be interpreted as the stabilization of the superconducting state by an increase of the characteristic spin fluctuation temperature T-SF (T(SF infinity)k(F)(2)/m(eff)). Interestingly, in CeCoIn5 the ratio DeltaC/gammaT(c) approximate to 5 is extremely large but starts to decrease rapidly with increasing p at p > 0.8 GPa where T,(p) approaches a maximum. (C) 2002 Elsevier Science B.V. All rights reserved.

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Language(s): eng - English
 Dates: 2002-03
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 18506
ISI: 000175871000050
DOI: 10.1016/S0921-4526(01)01090-0
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Title: Physica B
  Alternative Title : Physica B
Source Genre: Journal
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Publ. Info: -
Pages: - Volume / Issue: 312 Sequence Number: - Start / End Page: 138 - 139 Identifier: ISSN: 0921-4526