Unusual Sn State in the Superconducting Disordered Selenide Ag1-xSn1+xSe2

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APS March Meeting 2021

Volume 66, Number 1

Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA

Session C47: MgB2, Complex Compounds, Organics, and Other Superconductors

3:00 PM–5:48 PM, Monday, March 15, 2021

Sponsoring Unit: DCMP
Chair: John Wei, Univ of Toronto

Abstract: C47.00008 : Unusual Sn State in the Superconducting Disordered Selenide Ag_1-xSn_1+xSe₂*

4:24 PM–4:36 PM Live

Abstract

Presenter:

Mohamed Oudah
(Max Planck Institute for Solid State Research, Stuttgart, Germany)

Authors:

Mohamed Oudah
(Max Planck Institute for Solid State Research, Stuttgart, Germany)

Jose Lado
(Institut für Theoretische Physik, ETH Zürich, Zürich, Switzerland)

Shinji Kitao
(Institute for Integrated Radiation and Nuclear Science, Kyoto University, Osaka, Japan)

Graham McNally
(Max Planck Institute for Solid State Research, Stuttgart, Germany)

Kathrin Küster
(Max Planck Institute for Solid State Research, Stuttgart, Germany)

Makoto Seto
(Institute for Integrated Radiation and Nuclear Science, Kyoto University, Osaka, Japan)

Douglas A. Bonn
(Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, Canada)

Bernhard Keimer
(Max Planck Institute for Solid State Research, Stuttgart, Germany)

Manfred W Sigrist
(Institut für Theoretische Physik, ETH Zürich, Zürich, Switzerland)

George Albert Sawatzky
(Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, Canada)

Hidenori Takagi
(Max Planck Institute for Solid State Research, Stuttgart, Germany)

We investigate the NaCl-type superconducting series Ag_1-xSn_1+xSe₂ by means of XPS and Mössbauer spectroscopy. By varying the Ag/Sn ratio we observe a change in the ratio of 2+ and 4+ state of Sn as probed by XPS, with increasing 2+ state as the Sn amount is increased. In contrast, we detect only one state for Sn in the Mössbauer spectra, which corresponds to the unusual 3+ state for Ag:Sn of 1:1. We study the Mössbauer spectra at low temperature to elucidate the charge fluctuations scenario for Sn. Furthermore, we calculate the band structure of AgSnSe2, which reveal contributions from all three elements near the fermi level. We discuss the experimentally measured state of Sn in light of our calculations.

*We thank the Max Planck-UBC-UTokyo Center for Quantum Materials for support.

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Bulletin of the American Physical Society

APS March Meeting 2021

Volume 66, Number 1

Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA

Session C47: MgB2, Complex Compounds, Organics, and Other Superconductors

Abstract: C47.00008 : Unusual Sn State in the Superconducting Disordered Selenide Ag1-xSn1+xSe2*

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Authors:

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Abstract: C47.00008 : Unusual Sn State in the Superconducting Disordered Selenide Ag_1-xSn_1+xSe₂*