Pressure induced valence and structural transition in Ce<sub>2</sub>Ni<sub>3</sub>Ge<sub>5</sub> heavy fermion superconductor

ORAL

Abstract

Valence fluctuation, magnetic ordering, orbital fluctuations and crystal structure play important roles in the origin of pressure induced superconductivity in the heavy fermion materials across quantum critical point (QCP) [1]. Here we report the Ce valence and crystal structure behavior of the heavy fermion material Ce2Ni3Ge5 around the proximity of superconducting regime at high pressures and low temperatures. The valence of Ce continuously increases showing an anomaly around critical pressure where superconductivity was reported, and a pressure induced structural transition from the orthorhombic to a monoclinic type of symmetry occurs above 5 GPa. The results of the Self-Interaction Correction – Local Spin Density Approximation (SIC-LSDA) theoretical calculations show the Ce 4f electrons delocalization upon compression is consistent with experiments.

Reference

[1]. Scheerer, G.W., Ren, Z., Watanabe, S. et al. The dominant role of critical valence fluctuations on high Tc superconductivity in heavy fermions. npj Quant Mater 3, 41 (2018).

*This research was sponsored (or sponsored in part) by the National Nuclear Security Administration under the Stewardship Science Academic Alliances program through DOE Cooperative Agreement #DE-NA0001982. Funding support by the US Department of Energy/National Nuclear Security Administration through the Chicago/DOE Alliance Center (CDAC), Award DE-NA0003975 is acknowledged.

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Publication: Pressure induced valence and structural transition in Ce2Ni3Ge5 heavy fermion superconductor (under preparation)

Presenters

  • 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

Authors

  • 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

  • Melanie White

    • Department of Physics, University of Nevada Las Vegas, 4505 Maryland Pkwy, Las Vegas, NV 89054, USA

  • Leon Petit

    • Science and Technology Facilities Council, Daresbury Laboratory, Daresbury WA4 4AD, United Kingdom

  • Zdzislawa Szotek

    • Science and Technology Facilities Council, Daresbury Laboratory, Daresbury WA4 4AD, United Kingdom

  • Anuroopa Behatha

    • Department of Physics, Indian Institute of Technology Hyderabad, Kandi Sanga Reddy 502 284, Telengana, India

  • Sébastien Lebègue

    • Laboratoire de Physique et Chimie Théoriques (LPCT, UMR CNRS 7019) Institut Jean Barriol, Université de Lorraine, BP 239, Boulevard des Aiguillettes,54506 Vandoeuvre-lès-Nanc

  • Vaitheeswaran Ganapathy

    • School of Physics, University of Hyderabad, Prof. C. R. Rao Road, Gachibowli, Hyderabad 500 046, Telengana, India

  • Kanchana Venkatakrishnan

    • Department of Physics, Indian Institute of Technology Hyderabad, Kandi Sanga Reddy 502 284, Telengana, India

  • Daniel Haskel

    • Argonne National Laboratory
    • Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL, USA

  • Gilberto Fabbris

    • Argonne National Laboratory
    • Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL, USA

  • 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

  • Jun Gouchi

    • Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan

  • Yoshiya Uwatoko

    • University of Tokyo
    • Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan

  • Thamizhavel Arumugam

    • Tata Institute of Fundamental Research, Mumbai, India
    • Tata Institute of Fundamental Research
    • Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005, India