I Sheikin et al 2002 J. Phys.: Condens. Matter 14 L543 doi:10.1088/0953-8984/14/28/104
Specific heat of heavy-fermion CePd2Si2 in high magnetic fields
FREE ARTICLEI Sheikin1, Y Wang1, F Bouquet1, P Lejay2 and A Junod1
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We report specific heat measurements on the heavy-fermion compound CePd2Si2 in magnetic fields up to 16 T and in the temperature range 1.4–16 K. A sharp peak in the specific heat signals the antiferromagnetic transition at TN ~ 9.3 K in zero field. The transition is found to shift to lower temperatures when a magnetic field is applied along the crystallographic a-axis, while a field applied parallel to the tetragonal c-axis does not affect the transition. The magnetic contribution to the specific heat below TN is well described by a sum of a linear electronic term and an antiferromagnetic spin-wave contribution. Just below TN, an additional positive curvature, especially at high fields, arises most probably due to thermal fluctuations. The field dependence of the coefficient of the low-temperature linear term, γ0, extracted from the fits shows a maximum at about 6 T, at the point where an anomaly was detected in susceptibility measurements. The relative field dependences of both TN and the magnetic entropy at TN scale as [1 − (B/B0)2] for B || a, suggesting the disappearance of antiferromagnetism at B0 ~ 42 T. The expected suppression of the antiferromagnetic transition temperature to zero makes the existence of a magnetic quantum critical point possible.
- PACS
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75.20.Hr Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions
75.30.Kz Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)
- Subjects
- Dates
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Issue 28 (22 July 2002)
Received 24 April 2002, in final form 22 May 2002
Published 5 July 2002
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Specific heat of heavy-fermion CePd2Si2 in high magnetic fields
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