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

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Sparn,  G.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Borth,  R.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Lengyel,  E.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Steglich,  F.
Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

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.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0015-3171-8
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)).