Strange critical behaviors of ferromagnetic to paramagnetic transition in La0.5Ca0.5MnO3 nanowires bundles. Issue 27 (25th February 2016)

• Record Type: Journal Article
• Authors: Fang, Fei; Hong, Bo; Ling, Langsheng; Xu, Jingcai; Jin, Hongxiao; Jin, Dingfeng; Peng, Xiaoling; Li, Jing; Yang, Yanting; Wang, Xinqing
• Is Part Of: RSC advances. Volume 6:Issue 27(2016)
• Page Start: 22411
• Page End: 22418
• Publication Date: 2016-02-25
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra00650g
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : La0.5 Ca0.5 MnO3 nanowire bundles were synthesized by a hard template method, followed by further investigation on their strange critical behaviors. Abstract : Highly ordered La0.5 Ca0.5 MnO3 nanowires bundles are synthesized using mesoporous SBA-15 silica as the hard template. The magnetic properties and critical behaviors of the ferromagnetic–paramagnetic (FM–PM) phase transition of the La0.5 Ca0.5 MnO3 nanowires bundles are investigated through isothermal magnetization methods. The calculated results show that the FM–PM transition is second order and the magnetic interaction has some deviations from the mean-field model. Though the obtained critical parameters of β = 0.596 ± 0.009, γ = 1.131 ± 0.008 and δ = 2.99 ± 0.05 follow the Widom scaling relation δ = 1 + γ / β and the single scaling equation M ( H, | ε |) = ε β f ± ( H /| ε | β + γ ), the critical exponents do not obey the magnetization entropy scaling theory, indicating that the nanometer-size effect play a significant role on the magnetic phase transition and magnetic entropy for La0.5 Ca0.5 MnO3 nanowires bundles.