Pramana | |
Magnetic-ï¬eld-induced valence transition in rare-earth systems | |
A Ramakanth2  G Gangadhar Reddy12  S K Ghatak1  | |
[1] Department of Physics, Indian Institute of Technology, Kharagpur 721 302, India$$;Department of Physics, Kakatiya University, Warangal 506 009, India$$ | |
关键词: Magnetic ï¬eld; valence transition; rare-earths.; | |
DOI : | |
学科分类:物理(综合) | |
来源: Indian Academy of Sciences | |
【 摘 要 】
The magnetic-ï¬eld-induced valence transition in rare-earth systems has been investigated using the periodic Anderson model supplemented by the Falicov–Kimball term. This model has been solved by ï¬rst decoupling the Falicov–Kimball term as proposed by Khomskii and Koharjan and then taking the limit of inï¬nite intra-site Coulomb repulsion. The valence transition both in the absence and in the presence of magnetic ï¬eld as a function of temperature is studied. It has been found that the system makes transition from non-magnetic to magnetic state when the magnetic ï¬eld increases beyond a critical value ð»c. The phase boundary deï¬ned in terms of reduced ï¬eld ð»c(ð‘‡)/ð»c(0) and reduced temperature ð‘‡/ð‘‡v (ð‘‡v being the valence transition temperature in the absence of ï¬eld) is almost independent of the position of the localized level. The results are in qualitative agreement with experimental observations in Yb- and Eu-compounds.
【 授权许可】
Unknown
【 预 览 】
Files | Size | Format | View |
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RO201912040495998ZK.pdf | 56KB | download |