Magnetic heat capacity in lanthanum manganite single crystals

P. Lin, S. H. Chun, M. B. Salamon, Y. Tomioka, Y. Tokura

Research output: Contribution to journalConference articlepeer-review

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Abstract

The heat capacity of single crystal La0.7D0.3MnO3, where D=Ca, Sr, has been measured through the Curie point in fields up to 70 kOe. The magnetic contribution of the Ca sample exhibits a sharp heat capacity peak at TC≃218 K in zero field. The peak broadens and decreases in height with increasing field but, unlike an ordinary ferromagnet, the peak shifts substantially in temperature. As a consequence, the heat capacity data cannot be collapsed into a single scaling function. These features indicate that the transition is not an ordinary second-order ferromagnetic transition. Preliminary heat capacity data from the Sr-doped single crystal, with TC≃360 K, do not exhibit the same shift in peak position with applied field. We attribute the difference in behavior between Ca-and Sr-doped samples to a change in the nature of the phase transition as TC lowers.

Original languageEnglish
Pages (from-to)5825-5827
Number of pages3
JournalJournal of Applied Physics
Volume87
Issue number9 II
DOIs
StatePublished - May 2000
Event44th Annual Conference on Magnetism and Magnetic Materials - San Jose, CA, United States
Duration: 15 Nov 199918 Nov 1999

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