Tetsuya Takeuchi et al 2002 J. Phys.: Condens. Matter 14 L261 doi:10.1088/0953-8984/14/12/105
Thermal expansion and magnetostriction studies in a heavy-fermion superconductor, CeCoIn5
FREE ARTICLETetsuya Takeuchi1,4, Hiroaki Shishido2, Shugo Ikeda2, Rikio Settai2, Yoshinori Haga3 and Yoshichika Onuki2,3
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We have measured the iso-field thermal expansion and magnetostriction in a heavy-fermion superconductor, CeCoIn5, with tetragonal structure. The thermal expansion at zero field shrinks for the [100] direction in the superconducting state, while it expands for [001]. The magnetic field effect on the superconducting transition at the superconducting transition temperature Tc is remarkable for [001]. The longitudinal magnetostriction for H
[001] shows a continuous field dependence with a bend at the upper critical field Hc2 below Tc, but this feature changes into a steplike transition below about 0.7 K, indicating that the transition changes from the second to the first order. We have also measured the thermal expansion at high temperatures, which is compared with those in CeIrIn5 and CeRhIn5.
- PACS
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74.70.Tx Heavy-fermion superconductors
74.40.+k Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.)
74.25.Fy Transport properties (electric and thermal conductivity, thermoelectric effects, etc.)
75.80.+q Magnetomechanical and magnetoelectric effects, magnetostriction
74.62.Bf Effects of material synthesis, crystal structure, and chemical composition
- Subjects
- Dates
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Issue 12 (1 April 2002)
Received 4 February 2002, in final form 11 February 2002
Published 15 March 2002
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Thermal expansion and magnetostriction studies in a heavy-fermion superconductor, CeCoIn5
Tetsuya Takeuchi et al 2002 J. Phys.: Condens. Matter 14 L261
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