Valence State of Eu and Superconductivity in Se-Substituted EuSr2Bi2S4F4 and Eu2
SrBi2S4F4

Haque, Zeba; Thakur, Gohil Singh; Selvan, Ganesan Kalai; Block, Theresa; Janka, Oliver; Poettgen, Rainer; Joshi, Amish G.; Parthasarathy, Rangasamy; Arumugam, Sonachalam; Gupta, Laxmi Chand; Ganguli, Ashok Kumar

doi:10.1021/acs.inorgchem.7b01555

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Valence State of Eu and Superconductivity in Se-Substituted EuSr₂Bi₂S₄F₄ and Eu₂SrBi₂S₄F₄

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Thakur, Gohil Singh
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Haque, Z., Thakur, G. S., Selvan, G. K., Block, T., Janka, O., Poettgen, R., et al. (2018). Valence State of Eu and Superconductivity in Se-Substituted EuSr₂Bi₂S₄F₄ and Eu₂SrBi₂S₄F₄. Inorganic Chemistry, 57(1), 37-44. doi:10.1021/acs.inorgchem.7b01555.

Cite as: https://hdl.handle.net/21.11116/0000-0000-6443-4

Abstract

Recently, we reported the synthesis and investigations of EuSr2Bi2S4F4 and Eu2SrBi2S4F4. We have now been able to induce superconductivity in EuSr2Bi2S4F4 by Se substitution at the S site (isovalent-substitution) with T-c = 2.9 K in EuSr2Bi2S2Se2F4. The other compound, Eu2SrBi2S4F4, shows a significant enhancement of Tc. In Se-substituted Eu2SrBi2S4-xSexF4, we find T-c = 2.6 K for x = 1.5 and T-c = 2.8 K for x = 2, whereas T-c = 0.4 K in the Se-free sample. In addition to Superconductivity, an important effect associated with Se substitution is that it gives rise to remarkable changes in the Eu valence. Our Eu-151 Mossbauer and X-ray photoemission spectroscopic measurements show that Se substitution in both of the compounds Eu2SrBi2S4F4 and EuSr2Bi2S4F4 gives rise to an increase in the Eu2+ component in the mixed-valence state of Eu.