NDLI: Disappearance of Griffiths Phase in Polycrystalline Sample La$_{0.75}$Ca$_{0.15}$MnO$

Content Provider	Springer Nature Link
Author	Zhang, Hongguang Li, Yongtao Liu, Hao Dong, Xueguang Chen, Kai Hou, Qingteng Li, Qi
Copyright Year	2012
Abstract	The Griffiths phase has been investigated in terms of oxygen vacancy in polycrystalline samples La$_{0.75}$Ca$_{0.15}$MnO$_{3}$ (LCMO-1) and La$_{0.75}$Ca$_{0.15}$MnO$_{3−Δ}$ (LCMO-2). The latter of the two samples is prepared by annealing the former (with existence of Griffiths phase) in N$_{2}$ atmosphere. Experimental results demonstrate that for the latter sample Griffith’s phase disappears (according to its obeying Curie–Weiss law in the temperature dependence of inverse susceptibility) due to redistribution of magnetic disorder between Mn$^{3+}$ and Mn$^{4+}$ ions induced by the increment of crystal lattice structure parameters. XRD patterns of the two samples show an increase of crystal lattice structure parameters. X-ray absorption fine structure data manifest that the degree of structural disorder in LCMO-2 sample is higher than that of LCMO-1, indicating that local structural disorder in this system is not the key role to affect the existence of Griffiths phase, while magnetic distribution/disorder is an important character.
Starting Page	2365
Ending Page	2370
Page Count	6
File Format	PDF
ISSN	15571939
Journal	Journal of Superconductivity and Novel Magnetism
Volume Number	25
Issue Number	7
e-ISSN	15571947
Language	English
Publisher	Springer US
Publisher Date	2012-05-11
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Griffiths phase X-ray Absorption Spectroscopy (XAS) X-ray Absorption Fine Structure (XAFS) Magnetic disorder Characterization and Evaluation of Materials Strongly Correlated Systems, Superconductivity Condensed Matter Physics Magnetism, Magnetic Materials
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Condensed Matter Physics

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