Regensburg 2022 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 6: Kondo Physics, f-Electron Systems and Heavy Fermions

TT 6.9: Vortrag

Montag, 5. September 2022, 17:15–17:30, H22

Anisotropy of resistivity and magnetotransport in CeRh2As2 — •Konstantin Semeniuk, Seunghyun Khim, and Elena Hassinger — Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany

The recently discovered heavy-fermion superconductor CeRh2As2 exhibits an intriguing low-temperature phase diagram containing two superconducting states [1], a quadrupole density wave order [2], and an antiferromagnetic state [3]. The underlying mechanisms of such a behaviour are currently being explored. However, symmetry-induced Rashba spin-orbit effect, Kondo interaction and interlayer coupling have already emerged as the primary ingredients.

To quantify the electronic properties of the compound further, we conducted a comprehensive study of charge transport in CeRh2As2. Precise control over sample dimensions and current flow direction were achieved via focused ion beam micromachining of single crystals in a strain-free manner. Based on resistivity anisotropy measurements the three-dimensional character of the electronic structure is established. We also examine magnetoresistance and Hall effect for different orientations of magnetic field with respect to the lattice.

[1] J. Landaeta et al., Phys. Rev. X, accepted (2022)

[2] D. Hafner et al., Phys. Rev. X 12, 011023 (2022)

[3] M. Kibune et al., Phys. Rev. Lett. 128, 057002 (2022)