Physical origin of superconductivity in EuFe2As1.4P0.6 and EuFe2As2: pressure-induce valence change of europium

Liling Sun; Jing Guo; Genfu Chen; Xianhui Chen; Xiaoli Dong; Wei Lu; Chao Zhang; Zheng Jiang; Bo Zou; Yuying Huang; Qi Wu; Xi Dai; Zhongxian Zhao

arXiv · 1005.3375

Physical origin of superconductivity in EuFe2As1.4P0.6 and EuFe2As2: pressure-induce valence change of europium

Liling Sun·Jing Guo·Genfu Chen·Xianhui Chen·Xiaoli Dong·Wei Lu·Chao Zhang·Zheng Jiang·Bo Zou·Yuying Huang·Qi Wu·Xi Dai·Zhongxian Zhao

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Abstract

Superconductivity can be realized in Eu-containing pnictides by application of chemical (internal) and physical (external) pressure, the intrinsic physical mechanism of which attracts much attention in physics community. Here we present the experimental evidence for the valence change of europium in compounds of EuFe2As1.4P0.6 exposed to ambient pressure and EuFe2As2 to high pressure by x-ray absorption measurements on L3-Eu edge. We find that the absorption spectrum of EuFe2As1.4P0.6 at ambient pressure shows clear spectra weight transfer from a divalent to a trivalent state. Furthermore, application of pressure on EuFe2As2 using a diamond anvil cell shows a similar behavior of valence transition as EuFe2As1.4P0.6. These findings are the first observation of superconductivity mechanized by valence change in pnictides superconductors and elucidate the intrinsic physical origin of superconductivity in EuFe2As1.4P0.6 and compressed EuFe2As2.

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Liling Sun, Jing Guo, Genfu Chen, Xianhui Chen, Xiaoli Dong, Wei Lu, Chao Zhang, Zheng Jiang, Bo Zou, Yuying Huang, Qi Wu, Xi Dai, Zhongxian Zhao. 2010-05-19. Physical origin of superconductivity in EuFe2As1.4P0.6 and EuFe2As2: pressure-induce valence change of europium. https://arxiv.org/abs/1005.3375

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