Volume 112, Number 1, October 2015
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||15 October 2015|
Critical behavior and long-range ferromagnetic order in perovskite manganite Nd0.55Sr0.45MnO3
1 Department of Applied Physics, Nanjing University of Aeronautics and Astronautics - Nanjing 210016, China
2 Department of Physics, University of Göttingen - Tammanstrasse 1-37077, Göttingen, Germany
3 Faculty of Physics and Electronic Technology, Hubei University - Wuhan 430062, China
Received: 14 March 2015
Accepted: 24 September 2015
The critical behavior of perovskite manganite Nd0.55Sr0.45MnO3 has been investigated based on the static magnetization measurement around the paramagnetic-ferromagnetic transition temperature 273 K. A large critical exponent and a small one have been obtained by calculating the magnetic-field dependence of the magnetic-entropy change and the Widom scaling relation. These critical exponents not only obey the scaling hypothesis, but also corroborate the results obtained from the Kouvel-Fisher method. In comparison with the values given by standard models, these obtained exponents are very close to those expected from the mean-field model ( and ) and its magnetic-coupling type belongs to nearly long-range interaction. We suggest that the A-site spin disorder and localized magnetic phase competition are the main reasons for the actual critical exponents to show a slight deviation from the theoretical model.
PACS: 75.47.Lx – Magnetic oxides / 75.40.-s – Critical-point effects, specific heats, short-range order / 75.60.-d – Domain effects, magnetization curves, and hysteresis
© EPLA, 2015
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