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Valence State of Eu and Superconductivity in Se-Substituted EuSr

Valence State of Eu and Superconductivity in Se-Substituted EuSr

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

Inorg Chem. 2018 Jan 2;57(1):37-44.

PMID: 29236485

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 Tc = 2.9 K in EuSr2Bi2S2Se2F4. The other compound, Eu2SrBi2S4F4, shows a significant enhancement of Tc. In Se-substituted Eu2SrBi2S4-xSexF4, we find Tc = 2.6 K for x = 1.5 and Tc = 2.8 K for x = 2, whereas Tc = 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 151Eu Mössbauer 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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP15901492	2,4,6-Triethyl-2,4,6-trimethylcyclotrisiloxane		15901-49-2	Price

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