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 language | English |
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Pages (from-to) | 5825-5827 |
Number of pages | 3 |
Journal | Journal of Applied Physics |
Volume | 87 |
Issue number | 9 II |
DOIs | |
State | Published - May 2000 |
Event | 44th Annual Conference on Magnetism and Magnetic Materials - San Jose, CA, United States Duration: 15 Nov 1999 → 18 Nov 1999 |