The critical behavior of Pr1−xCaxMnO3 samples with x = 0.25, 0.27, and 0.29 has been investigated. Detailed analyses of magnetic-field dependences of magnetization at temperatures around the paramagnetic-ferromagnetic transition, M(H, T), reveal that the samples undergo a second-order magnetic phase transition. The Arrott plot method predicts the values of critical parameters to be TC ≈ 118 K, β = 0.351 ± 0.003, γ = 1.372 ± 0.002, and δ = 4.90 ± 0.02 for x = 0.25; TC ≈ 116 K, β = 0.362 ± 0.002, γ = 1.132 ± 0.004, and δ = 4.09 ± 0.03 for x = 0.27; and TC ≈ 110 K, β = 0.521 ± 0.002, γ = 0.912 ± 0.005, and δ = 2.71 ± 0.02 for x = 0.29. The values of β = 0.351 (for x = 0.25) and β = 0.362 (for x = 0.27) are close to the value β = 0.365 expected for the 3D Heisenberg model, proving an existence of short-range ferromagnetic interactions in these samples. A slight increase in Ca-doping content (x = 0.29) leads to the shift of the β value (=0.521) towards that of the mean-field theory (with β = 0.5) characteristic of long-range ferromagnetic interactions. The samples also exhibit a magnetocaloric effect: around TC of Pr1−xCaxMnO3 compounds, magnetic-entropy change reaches the maximum values of about 5.0, 4.1, and 2.5 J kg−1 K−1 for x = 0.25, 0.27, and 0.29, respectively, under an applied-field change of 50 kOe. Magnetic-field dependences of the maximum magnetic-entropy change (ΔSmax) obey a power law |ΔSmax(H)| ∝ Hn, where exponent values n = 0.68–0.74 are close to those obtained from the theoretical relation n = 1 + (β − 1)/(β + γ).
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7 May 2015
Research Article|
Magnetism and Magnetic Materials|
March 13 2015
Critical behavior and magnetocaloric effect of Pr1−xCaxMnO3
T. A. Ho;
T. A. Ho
1Department of Physics,
Chungbuk National University
, Cheongju 361-763, South Korea
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T. D. Thanh;
T. D. Thanh
1Department of Physics,
Chungbuk National University
, Cheongju 361-763, South Korea
2
Institute of Materials Science
, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Hanoi, Vietnam
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Yikyung Yu;
Yikyung Yu
3Department of Mechanical and Aerospace Engineering,
University of California
, San Diego, California 92093-0411, USA
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D. M. Tartakovsky
;
D. M. Tartakovsky
3Department of Mechanical and Aerospace Engineering,
University of California
, San Diego, California 92093-0411, USA
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T. O. Ho;
T. O. Ho
4
Institute of Chemistry
, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Hanoi, Vietnam
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P. D. Thang;
P. D. Thang
5Faculty of Engineering Physics and Nanotechnology,
VNU University of Engineering and Technology
, 144 Xuan Thuy, Cau Giay, Hanoi, Vietnam
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Anh-Tuan Le
;
Anh-Tuan Le
6Department of Nanoscience and Nanotechnology, Advanced Institute for Science and Technology,
Hanoi University of Science and Technology
, 01 Dai Co Viet, Hai Ba Trung, Hanoi, Vietnam
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The-Long Phan;
The-Long Phan
1Department of Physics,
Chungbuk National University
, Cheongju 361-763, South Korea
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a)
Electronic mail: scyu@chungbuk.ac.kr. Fax: +82-43-275-6416
J. Appl. Phys. 117, 17D122 (2015)
Article history
Received:
September 18 2014
Accepted:
November 02 2014
Citation
T. A. Ho, T. D. Thanh, Yikyung Yu, D. M. Tartakovsky, T. O. Ho, P. D. Thang, Anh-Tuan Le, The-Long Phan, S. C. Yu; Critical behavior and magnetocaloric effect of Pr1−xCaxMnO3. J. Appl. Phys. 7 May 2015; 117 (17): 17D122. https://doi.org/10.1063/1.4914537
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