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

doi:10.1103/PhysRevB.95.064515

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

Research Institute for Interdisciplinary Science

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11 Citations (Scopus)

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 language	English
Article number	064515
Journal	Physical Review B
Volume	95
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevB.95.064515
Publication status	Published - Feb 27 2017

ASJC Scopus subject areas

Condensed Matter Physics

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Mizuguchi, Y., Paris, E., Wakita, T., Jinno, G., Puri, A., Terashima, K., Joseph, B., Miura, O., Yokoya, T., & 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

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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.",

author = "Y. Mizuguchi and E. Paris and Takanori Wakita and G. Jinno and A. Puri and Kensei Terashima and B. Joseph and O. Miura and Takayoshi Yokoya and Saini, {N. L.}",

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AU - Mizuguchi, Y.

AU - Paris, E.

AU - Wakita, Takanori

AU - Jinno, G.

AU - Puri, A.

AU - Terashima, Kensei

AU - Joseph, B.

AU - Miura, O.

AU - Yokoya, Takayoshi

AU - Saini, N. L.

PY - 2017/2/27

Y1 - 2017/2/27

N2 - 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.

AB - 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.

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