Regensburg 2022 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 22: Unconventional Superconductors

TT 22.13: Vortrag

Mittwoch, 7. September 2022, 18:45–19:00, H10

Superconductivity in CrB₂ under pressure: Role of electron-phonon coupling and spin-fluctuations — •Sananda Biswas¹, Andreas Kreisel², Ronny Thomale³, Roser Valentí¹, and Igor Mazin⁴ — ¹Goethe Universität, Frankfurt, Germany — ²Universität Leipzig, Leipzig, Germany — ³Julius-Maximilians-Universität Würzburg, Würzburg, Germany — ⁴George Mason University, Fairfax, VA, USA

Superconductivity has recently been discovered in CrB₂ under pressure with maximum reported T_c to be 7 K. Iso-structural to MgB₂, CrB₂ exhibits spin-density-wave (SDW) ground state at ambient pressure. In this talk, I will focus on the role of spin-fluctuations and electron-phonon coupling (EPC) in determining the T_c. We have performed ab-initio density functional perturbation theory to determine the EPC of this system and to study the spin-fluctuation, random-phase-approximation (RPA) has been employed.