Evolution of Eu valence and superconductivity in layered Eu0.5La0.5FBiS2-xSex system

Y. Mizuguchi, E. Paris, Takanori Wakita, G. Jinno, A. Puri, Kensei Terashima, B. Joseph, O. Miura, Takayoshi Yokoya, N. L. Saini

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Abstract

We have studied the effect of Se substitution on Eu valence in a layered Eu0.5La0.5FBiS2-xSex superconductor using a combined analysis of x-ray absorption near-edge structure (XANES) and x-ray photoelectron spectroscopy (XPS) measurements. Eu L3-edge XANES spectra reveal that Eu is in the mixed valence state with coexisting Eu2+ and Eu3+. The average Eu valence decreases sharply from ∼2.3 for x=0.0 to ∼2.1 for x=0.4. Consistently, Eu 3d XPS shows a clear decrease in the average valence by Se substitution. Bi 4f XPS indicates that effective charge carriers in the BiCh2 (Ch = S, Se) layers are slightly increased by Se substitution. On the basis of the present results it has been discussed that the metallic character induced by Se substitution in Eu0.5La0.5FBiS2-xSex is likely to be due to increased in-plane orbital overlap driven by reduced in-plane disorder that affects the carrier mobility.

Original languageEnglish
Article number064515
JournalPhysical Review B
Volume95
Issue number6
DOIs
Publication statusPublished - Feb 27 2017

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Superconductivity
superconductivity
substitutes
x ray spectroscopy
valence
Substitution reactions
X rays
Photoelectron spectroscopy
photoelectron spectroscopy
x ray absorption
carrier mobility
Carrier mobility
charge carriers
Charge carriers
Superconducting materials
disorders
orbitals

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Mizuguchi, Y., Paris, E., Wakita, T., Jinno, G., Puri, A., Terashima, K., ... Saini, N. L. (2017). Evolution of Eu valence and superconductivity in layered Eu0.5La0.5FBiS2-xSex system. Physical Review B, 95(6), [064515]. https://doi.org/10.1103/PhysRevB.95.064515

Evolution of Eu valence and superconductivity in layered Eu0.5La0.5FBiS2-xSex system. / Mizuguchi, Y.; Paris, E.; Wakita, Takanori; Jinno, G.; Puri, A.; Terashima, Kensei; Joseph, B.; Miura, O.; Yokoya, Takayoshi; Saini, N. L.

In: Physical Review B, Vol. 95, No. 6, 064515, 27.02.2017.

Research output: Contribution to journalArticle

Mizuguchi, Y, Paris, E, Wakita, T, Jinno, G, Puri, A, Terashima, K, Joseph, B, Miura, O, Yokoya, T & Saini, NL 2017, 'Evolution of Eu valence and superconductivity in layered Eu0.5La0.5FBiS2-xSex system', Physical Review B, vol. 95, no. 6, 064515. https://doi.org/10.1103/PhysRevB.95.064515
Mizuguchi, Y. ; Paris, E. ; Wakita, Takanori ; Jinno, G. ; Puri, A. ; Terashima, Kensei ; Joseph, B. ; Miura, O. ; Yokoya, Takayoshi ; Saini, N. L. / Evolution of Eu valence and superconductivity in layered Eu0.5La0.5FBiS2-xSex system. In: Physical Review B. 2017 ; Vol. 95, No. 6.
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