Superconductivity in (Ba,K)SbO3

Minu Kim; Graham M. McNally; Hun Ho Kim; Mohamed Oudah; Alexandra S. Gibbs; Pascal Manuel; Robert J. Green; Ronny Sutarto; Tomohiro Takayama; Alexander Yaresko; Ulrich Wedig; Masahiko Isobe; Reinhard K. Kremer; D. A. Bonn; Bernhard Keimer; Hidenori Takagi

doi:10.1038/s41563-022-01203-7

Superconductivity in (Ba,K)SbO₃

Minu Kim^*, Graham M. McNally, Hun Ho Kim, Mohamed Oudah, Alexandra S. Gibbs, Pascal Manuel, Robert J. Green, Ronny Sutarto, Tomohiro Takayama, Alexander Yaresko, Ulrich Wedig, Masahiko Isobe, Reinhard K. Kremer, D. A. Bonn, Bernhard Keimer, Hidenori Takagi^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

(Ba,K)BiO₃ constitute an interesting class of superconductors, where the remarkably high superconducting transition temperature T_c of 30 K arises in proximity to charge density wave order. However, the precise mechanism behind these phases remains unclear. Here, enabled by high-pressure synthesis, we report superconductivity in (Ba,K)SbO₃ with a positive oxygen–metal charge transfer energy in contrast to (Ba,K)BiO₃. The parent compound BaSbO_3−δ shows a larger charge density wave gap compared to BaBiO₃. As the charge density wave order is suppressed via potassium substitution up to 65%, superconductivity emerges, rising up to T_c = 15 K. This value is lower than the maximum T_c of (Ba,K)BiO₃, but higher by more than a factor of two at comparable potassium concentrations. The discovery of an enhanced charge density wave gap and superconductivity in (Ba,K)SbO₃ indicates that strong oxygen–metal covalency may be more essential than the sign of the charge transfer energy in the main-group perovskite superconductors.

Original language	English
Number of pages	11
Journal	Nature Materials
Volume	First Online
Early online date	28 Feb 2022
DOIs	https://doi.org/10.1038/s41563-022-01203-7
Publication status	E-pub ahead of print - 28 Feb 2022

Access to Document

10.1038/s41563-022-01203-7Licence: CC BY

Kim_2022_NatMat_Superconductivity-BaKSbO3_CC
Copyright © The Author(s) 2022. Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
Final published version, 3.4 MBLicence: CC BY

Cite this

@article{beb74c3a3e52470095b24666dbc1c2cb,

title = "Superconductivity in (Ba,K)SbO3",

abstract = "(Ba,K)BiO3 constitute an interesting class of superconductors, where the remarkably high superconducting transition temperature Tc of 30 K arises in proximity to charge density wave order. However, the precise mechanism behind these phases remains unclear. Here, enabled by high-pressure synthesis, we report superconductivity in (Ba,K)SbO3 with a positive oxygen–metal charge transfer energy in contrast to (Ba,K)BiO3. The parent compound BaSbO3−δ shows a larger charge density wave gap compared to BaBiO3. As the charge density wave order is suppressed via potassium substitution up to 65%, superconductivity emerges, rising up to Tc = 15 K. This value is lower than the maximum Tc of (Ba,K)BiO3, but higher by more than a factor of two at comparable potassium concentrations. The discovery of an enhanced charge density wave gap and superconductivity in (Ba,K)SbO3 indicates that strong oxygen–metal covalency may be more essential than the sign of the charge transfer energy in the main-group perovskite superconductors.",

author = "Minu Kim and McNally, {Graham M.} and Kim, {Hun Ho} and Mohamed Oudah and Gibbs, {Alexandra S.} and Pascal Manuel and Green, {Robert J.} and Ronny Sutarto and Tomohiro Takayama and Alexander Yaresko and Ulrich Wedig and Masahiko Isobe and Kremer, {Reinhard K.} and Bonn, {D. A.} and Bernhard Keimer and Hidenori Takagi",

note = "Funding: This research was carried out in part due to funding from the Max Planck-UBC-UTokyo Centre for Quantum Materials. Part of the research described in this paper was performed at the Canadian Light Source, a national research facility of the University of Saskatchewan, which is supported by the Canada Foundation for Innovation, the Natural Sciences and Engineering Research Council, the National Research Council, the Canadian Institutes of Health Research, the Government of Saskatchewan and the University of Saskatchewan. We thank the Science and Technology Facilities Council ISIS facility for the provision of beamtime.",

year = "2022",

month = feb,

day = "28",

doi = "10.1038/s41563-022-01203-7",

language = "English",

volume = "First Online",

journal = "Nature Materials",

issn = "1476-1122",

publisher = "Nature publishing group",

}

TY - JOUR

T1 - Superconductivity in (Ba,K)SbO3

AU - Kim, Minu

AU - McNally, Graham M.

AU - Kim, Hun Ho

AU - Oudah, Mohamed

AU - Gibbs, Alexandra S.

AU - Manuel, Pascal

AU - Green, Robert J.

AU - Sutarto, Ronny

AU - Takayama, Tomohiro

AU - Yaresko, Alexander

AU - Wedig, Ulrich

AU - Isobe, Masahiko

AU - Kremer, Reinhard K.

AU - Bonn, D. A.

AU - Keimer, Bernhard

AU - Takagi, Hidenori

N1 - Funding: This research was carried out in part due to funding from the Max Planck-UBC-UTokyo Centre for Quantum Materials. Part of the research described in this paper was performed at the Canadian Light Source, a national research facility of the University of Saskatchewan, which is supported by the Canada Foundation for Innovation, the Natural Sciences and Engineering Research Council, the National Research Council, the Canadian Institutes of Health Research, the Government of Saskatchewan and the University of Saskatchewan. We thank the Science and Technology Facilities Council ISIS facility for the provision of beamtime.

PY - 2022/2/28

Y1 - 2022/2/28

N2 - (Ba,K)BiO3 constitute an interesting class of superconductors, where the remarkably high superconducting transition temperature Tc of 30 K arises in proximity to charge density wave order. However, the precise mechanism behind these phases remains unclear. Here, enabled by high-pressure synthesis, we report superconductivity in (Ba,K)SbO3 with a positive oxygen–metal charge transfer energy in contrast to (Ba,K)BiO3. The parent compound BaSbO3−δ shows a larger charge density wave gap compared to BaBiO3. As the charge density wave order is suppressed via potassium substitution up to 65%, superconductivity emerges, rising up to Tc = 15 K. This value is lower than the maximum Tc of (Ba,K)BiO3, but higher by more than a factor of two at comparable potassium concentrations. The discovery of an enhanced charge density wave gap and superconductivity in (Ba,K)SbO3 indicates that strong oxygen–metal covalency may be more essential than the sign of the charge transfer energy in the main-group perovskite superconductors.

AB - (Ba,K)BiO3 constitute an interesting class of superconductors, where the remarkably high superconducting transition temperature Tc of 30 K arises in proximity to charge density wave order. However, the precise mechanism behind these phases remains unclear. Here, enabled by high-pressure synthesis, we report superconductivity in (Ba,K)SbO3 with a positive oxygen–metal charge transfer energy in contrast to (Ba,K)BiO3. The parent compound BaSbO3−δ shows a larger charge density wave gap compared to BaBiO3. As the charge density wave order is suppressed via potassium substitution up to 65%, superconductivity emerges, rising up to Tc = 15 K. This value is lower than the maximum Tc of (Ba,K)BiO3, but higher by more than a factor of two at comparable potassium concentrations. The discovery of an enhanced charge density wave gap and superconductivity in (Ba,K)SbO3 indicates that strong oxygen–metal covalency may be more essential than the sign of the charge transfer energy in the main-group perovskite superconductors.

U2 - 10.1038/s41563-022-01203-7

DO - 10.1038/s41563-022-01203-7

M3 - Article

AN - SCOPUS:85125304222

SN - 1476-1122

VL - First Online

JO - Nature Materials

JF - Nature Materials

ER -

Superconductivity in (Ba,K)SbO3

Abstract

Access to Document

Fingerprint

Cite this

Superconductivity in (Ba,K)SbO₃