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

Y. Mizuguchi; E. Paris; T. Wakita; G. Jinno; A. Puri; K. Terashima; B. Joseph; O. Miura; T. 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, T. Wakita, G. Jinno, A. Puri, K. Terashima, B. Joseph, O. Miura, T. Yokoya, N. L. Saini

Research Institute for Interdisciplinary Science

Research output: Contribution to journal › Article

13 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

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1103/PhysRevB.95.064515

Fingerprint Dive into the research topics of 'Evolution of Eu valence and superconductivity in layered Eu0.5La0.5FBiS2-xSex system'. Together they form a unique fingerprint.

Cite this

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

@article{393f5be0a8144493b49f2938dcb54ee9,

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

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 T. Wakita and G. Jinno and A. Puri and K. Terashima and B. Joseph and O. Miura and T. Yokoya and Saini, {N. L.}",

year = "2017",

month = feb,

day = "27",

doi = "10.1103/PhysRevB.95.064515",

language = "English",

volume = "95",

journal = "Physical Review B",

issn = "2469-9950",

publisher = "American Physical Society",

number = "6",

}

TY - JOUR

T1 - Evolution of Eu valence and superconductivity in layered Eu0.5La0.5FBiS2-xSex system

AU - Mizuguchi, Y.

AU - Paris, E.

AU - Wakita, T.

AU - Jinno, G.

AU - Puri, A.

AU - Terashima, K.

AU - Joseph, B.

AU - Miura, O.

AU - Yokoya, T.

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.

UR - http://www.scopus.com/inward/record.url?scp=85014588262&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85014588262&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.95.064515

DO - 10.1103/PhysRevB.95.064515

M3 - Article

AN - SCOPUS:85014588262

VL - 95

JO - Physical Review B

JF - Physical Review B

SN - 2469-9950

IS - 6

M1 - 064515

ER -