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Magnetic and critical properties of Pr 0.6 Sr 0.4 MnO 3 nanocrystals prepared by a combination of the solid state reaction and the mechanical ball milling methods

Research paper by Nguyen Thi Dung, Dinh Chi Linh, Pham Duc Huyen Yen, Seong Cho Yu, Nguyen Van Dang Tran Dang Thanh

Indexed on: 11 Jun '18Published on: 05 Jun '18Published in: Advances in Natural Sciences: Nanoscience and Nanotechnology



Abstract

Influence of the crystallite size on the magnetic and critical properties of ##IMG## [http://ej.iop.org/images/2043-6262/9/2/025010/ansnaac42bieqn001.gif] nanocrystals has been investigated. The results show that Curie temperature ##IMG## [http://ej.iop.org/images/2043-6262/9/2/025010/ansnaac42bieqn002.gif] and magnetization slightly decrease with decreasing average crystallite size ##IMG## [http://ej.iop.org/images/2043-6262/9/2/025010/ansnaac42bieqn003.gif] . Based on the mean-field theory and the magnetic-field dependences of magnetization at different temperatures ##IMG## [http://ej.iop.org/images/2043-6262/9/2/025010/ansnaac42bieqn004.gif] , we pointed out that the ferromagnetic-paramagnetic phase transition in the samples undergoes the second-order phase transition with the critical exponents ( ##IMG## [http://ej.iop.org/images/2043-6262/9/2/025010/ansnaa...]