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| Content Provider | Springer Nature Link |
|---|---|
| Author | Zhang, Hongguang Shi, Jiangjian Li, Yongtao Liu, Hao Dong, Xueguang Chen, Kai Hou, Qingteng Huang, Yongchao Ge, Xiaopeng Zhao, Liang Lu, Zixing Li, Qi |
| Copyright Year | 2012 |
| Abstract | Local atomic and electronic structure with magnetic properties, especially Griffiths phase, of polycrystalline samples La$_{0.7}$Ca$_{0.3}$Mn$_{1−x }$Cu$_{ x }$O$_{3}$ (x=0, 0.03, 0.06, 0.1) have been studied. The X-ray absorption spectra (XAS) of Cu 2p core level prove that the valence state of Cu ions exhibits trivalent state when doping content x≤0.06 and divalent Cu$^{2+}$ ions begin to show for x=0.1. For the valence states of Mn ions, the X-ray photoelectron spectroscopy data show that they are in mixed states of Mn$^{3+}$ and Mn$^{4+}$, and a shift to lower binding energy is observed, which is not attributed to the variation of valence states of Mn ions but the change of crystallographic surroundings, because there is no obvious change detected by X-ray absorption fine structure spectroscopy (XAFS). The Debye-Waller factor (σ $^{2}$) of x=0.1 sample is only slightly larger compared to x=0, which may be the origin of enhancement of Griffiths phase observed in the inverse-susceptibility as a function of temperature (H/M∼T). The H/M∼T curves of Cu doped samples indicate coexistence of FM, AFM and PM phase above Curie temperature T $_{ C }$, which may be related to the strong hybridization of O 2p and Mn 3d reflected by O 1s XAS spectra. |
| Starting Page | 77 |
| Ending Page | 89 |
| Page Count | 13 |
| File Format | |
| ISSN | 00222291 |
| Journal | Journal of Low Temperature Physics |
| Volume Number | 169 |
| Issue Number | 1-2 |
| e-ISSN | 15737357 |
| Language | English |
| Publisher | Springer US |
| Publisher Date | 2012-06-12 |
| Publisher Place | Boston |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Quenched disorder Griffiths phase X-ray absorption fine structure (XAFS) X-ray photoelectron spectroscopy (XPS) Ferromagnetism Magnetism, Magnetic Materials Characterization and Evaluation of Materials Condensed Matter Physics |
| Content Type | Text |
| Resource Type | Article |
| Subject | Atomic and Molecular Physics, and Optics Condensed Matter Physics Materials Science |
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