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Local Atomic and Electronic Structure with Magnetism of La0.7Ca0.3Mn1−x Cu x O3 (x=0, 0.03, 0.06, 0.1)

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Abstract

Local atomic and electronic structure with magnetic properties, especially Griffiths phase, of polycrystalline samples La0.7Ca0.3Mn1−x Cu x O3 (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 Cu2+ 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 Mn3+ and Mn4+, 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.

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Acknowledgements

This work was supported by the Large Scientific Apparatus united fund from National Natural Scientific Fund of China and Chinese Academy of Science for the projects 10979016, Jiangsu provincial Graduate Student Scientific Research Innovation Project No. CXLX_0096, and USTC Graduate Student Innovation Fund under Grant No. 20090621S. We are thankful to National Student Research Training Program of China (No. 101028622), and the Scientific Research Foundation of Graduate School of Southeast University (No. YBJJ1105). We also thank for the beamtime offered by NSRL and BSRF, respectively.

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Authors and Affiliations

  1. Department of Physics, Southeast University, Nanjing, 211189, P.R. China

    Hongguang Zhang, Jiangjian Shi, Yongtao Li, Hao Liu, Xueguang Dong, Kai Chen, Qingteng Hou, Yongchao Huang, Xiaopeng Ge, Liang Zhao, Zixing Lu & Qi Li

  2. Experimental Teaching Center of Physics, Nanjing University of Posts and Telecommunications, Nanjing, 210003, P.R. China

    Yongtao Li

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  1. Hongguang Zhang
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Zhang, H., Shi, J., Li, Y. et al. Local Atomic and Electronic Structure with Magnetism of La0.7Ca0.3Mn1−x Cu x O3 (x=0, 0.03, 0.06, 0.1). J Low Temp Phys 169, 77–89 (2012). https://doi.org/10.1007/s10909-012-0644-1

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