Griffiths phase-like behavior and origin of spin-phonon interaction in Eu0.75Y0.25MnO3

被引:5
作者
Gupta, Surbhi [1 ]
Sharma, Gaurav [2 ]
Reddy, V. R. [2 ]
Sathe, V. G. [2 ]
Siruguri, V [1 ]
机构
[1] UGC DAE Consortium Sci Res Mumbai Ctr, CFB, 246C,BARC Campus, Mumbai 400085, Maharashtra, India
[2] UGC DAE Consortium Sci Res Indore Ctr, Univ Campus,Khandwa Rd, Indore 452001, Madhya Pradesh, India
关键词
Manganites; Magnetization; Raman spectroscopy; Mossobauer spectroscopy; POLARIZATION; SCATTERING; REVERSAL;
D O I
10.1016/j.jmmm.2019.03.050
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The magnetic state and the spin-phonon coupling in the Eu0.75Y0.25MnO3 are investigated using temperature dependent magnetization, Raman spectroscopy and Mossbauer spectroscopy measurements. The magnetization data showed bifurcation in zero-field cooled and field-cooled warming curves and indicate two antiferromagnetic transitions at 47 K and 22 K. Short range ferromagnetic correlations are clearly observed well above the antiferromagnetic transition temperatures, which are attributed to the presence of Griffiths-like phase. The temperature dependent Raman spectroscopy measurements showed anomalous softening of phonon modes well above the antiferromagnetic ordering temperature of similar to 47 K and also showed signatures of both the ordering temperatures. The Mossbauer spectra showed anomalous changes in hyperfine field as a function of temperature which match with the temperature at which B-2g phonons showed softening.
引用
收藏
页码:38 / 43
页数:6
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