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Effect of pressure on unconventional superconductivity in CeCoIn5

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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. 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.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0015-319D-8
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.