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Probing the Anomalous Changes in Structural and Electronic Properties of Bi<sub>2</sub>Sr<sub>2</sub>Ca<sub>n–1</sub>Cu<sub>n</sub>O<sub>2n+4+δ </sub>to Megabar Pressures

ORAL

Abstract

The application of pressure is a unique tuning parameter for probing the properties of materials, including high-temperature superconductors [1]. Notable among the properties of the cuprate superconductors is the non-monotonic pressure dependance and increase in Tc for Bi2Sr2Can–1CunO2n+4+δ (n=1,2,3) compounds [2,3]. We report effects of pressures up to 140 GPa on the properties of these materials. All phases maintain a pseudo-tetragonal structure under pressure, but the pressure-volume relations are not well described by conventional equations of state. This anomalous compression has given rise to inconsistencies in previously reported high-pressure behavior of these materials. We conclude that the anomalous pressure-volume behavior of Bi2Sr2Can–1CunO2n+4+δ compounds is a manifestation of the changes in electronic properties that also give rise to the remarkable non-monotonic dependence of Tc with pressure, including the measured increase in Tc at the highest pressures studied so far for each material. Measurements to higher pressure are thus needed to fully characterize these interesting materials and to explore still higher possible critical temperatures.



[1] A.C. Mark et al. High Pres. Res. 42, 137-199 (2022).

[2] X.J. Chen et al., Nature 466, 950-953 (2010).

[3] L. Deng et al., PNAS 116, 2004-2008 (2019).

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Publication: Mark et al. in progress, "Anomalous compression of Bi2Sr2Can-1CunO2n+4+d from x-ray diffraction to megabar pressures"

Presenters

  • Alexander C Mark

    Department of Physics, University of Illinois at Chicago

Authors

  • Alexander C Mark

    Department of Physics, University of Illinois at Chicago

  • Muhtar Ahart

    University of Illinois at Chicago, Carnegie Inst of Washington, University of Illinois Chicago, Department of Physics, University of Illinois at Chicago

  • Ravhi Kumar

    University of Illinois at Chicago, University of Illinois Chicago, Department of Physics, University of Illinois Chicago, 845, W. Taylor Street, Chicago, IL 60607, University of Illinois, Chicago, Department of Physics, University of Illinois at Chicago

  • Changyong Park

    Argonne National Laboratory, HPCAT, X-ray Science Division, Argonne National Laboratory

  • Yue Meng

    Argonne National Laboratory, HPCAT, X-ray Science Division, Argonne National Laboratory

  • Dmitry Popov

    Argonne National Laboratory, HPCAT, X-ray Science Division, Argonne National Laboratory

  • Liangzi Deng

    University of Houston, Department of Physics and Texas Center for Superconductivity, University of Houston

  • Ching-Wu W Chu

    University of Houston, Department of Physics and Texas Center for Superconductivity, University of Houston

  • Juan Carlos Campuzano

    Department of Physics, University of Illinois at Chicago

  • Russell J Hemley

    University of Illinois at Chicago, University of Illinois Chicago, Departments of Physics, Chemistry, and Earth and Environmental Sciences, University of Illinois Chicago, Department of Physics and Chemistry, University of Illinois Chicago, 845, W. Taylor Street, Chicago, IL 60607, Departments of Physics, Chemistry, and Earth and Environmental Sciences, University of Illinois at Chicago