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Title: Magnetic heat capacity in lanthanum manganite single crystals

Abstract

The heat capacity of single crystal La{sub 0.7}D{sub 0.3}MnO{sub 3}, 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 T{sub C}(approx =)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 T{sub C}{approx_equal}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 T{sub C} lowers. (c) 2000 American Institute of Physics.

Authors:
 [1];  [1];  [1];  [2];  [2]
  1. Department of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801 (United States)
  2. Joint Research Center for Atom Technology, 1-1-4 Higashi, Tsukuba 305-0046, (Japan)
Publication Date:
OSTI Identifier:
20216251
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 87; Journal Issue: 9; Other Information: PBD: 1 May 2000; Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; SPECIFIC HEAT; LANTHANUM OXIDES; CALCIUM OXIDES; STRONTIUM OXIDES; MANGANESE OXIDES; CURIE POINT; PHASE TRANSFORMATIONS; EXPERIMENTAL DATA

Citation Formats

Lin, P., Chun, S. H., Salamon, M. B., Tomioka, Y., and Tokura, Y. Magnetic heat capacity in lanthanum manganite single crystals. United States: N. p., 2000. Web. doi:10.1063/1.372535.
Lin, P., Chun, S. H., Salamon, M. B., Tomioka, Y., & Tokura, Y. Magnetic heat capacity in lanthanum manganite single crystals. United States. doi:10.1063/1.372535.
Lin, P., Chun, S. H., Salamon, M. B., Tomioka, Y., and Tokura, Y. Mon . "Magnetic heat capacity in lanthanum manganite single crystals". United States. doi:10.1063/1.372535.
@article{osti_20216251,
title = {Magnetic heat capacity in lanthanum manganite single crystals},
author = {Lin, P. and Chun, S. H. and Salamon, M. B. and Tomioka, Y. and Tokura, Y.},
abstractNote = {The heat capacity of single crystal La{sub 0.7}D{sub 0.3}MnO{sub 3}, 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 T{sub C}(approx =)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 T{sub C}{approx_equal}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 T{sub C} lowers. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.372535},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 9,
volume = 87,
place = {United States},
year = {2000},
month = {5}
}