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Heat capacity of the heavy fermion superconductor CeIrIn5 under hydrostatic pressure

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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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Sparn,  G.
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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Borth, R., Lengyel, E., Pagliuso, P. G., Sarrao, J. L., Sparn, G., Steglich, F., et al. (2002). Heat capacity of the heavy fermion superconductor CeIrIn5 under hydrostatic pressure. Physica B, 312, 136-137. doi:10.1016/S0921-4526(01)01085-7.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0015-3181-4
Abstract
CeIrIn5 belongs to a new class of heavy fermion (HE) superconductors that crystallize in the tetragonal HoCoGa5- structure. This structure can be regarded as alternating layers of CeIn3 and IrIn2. Bulk CeIn(3)undergoes a transition from an antiferrornagnetic (AFM) state at ambient pressure (T-N = 10 K) to a superconductina state (T-c = 0.15 K) at a critical pressure p(c) = 2.8 GPa 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 CeIrIn5 at hydrostatic pressure pless than or equal to1.6 GPa. With increasing pressure, T-c increases almost linearly up to the maximum pressure applied, while the effective mass of the quasiparticles m(eff) decreases as indicated by the ratio C/T (T = 1 K). This may be interpreted as the stabilization of the superconducting state by the increase of the characteristic spinfluctuation temperature T-SF (T-SF:infinityk(p)(2)/c m(eff)). (C) 2002 Elsevier Science B.V. All rights reserved.