Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 17: Poster Session Correlated Electrons 1

TT 17.6: Poster

Montag, 16. März 2020, 15:00–19:00, P2/EG

Optical Spectroscopy of CeRh2As2 and LaRh2As2Shin-ichi Kimura1,2, Seunghyun Khim3, and •Jörg Sichelschmidt31Graduate School of Frontier Biosciences, Osaka University, Suita 565-0871, Japan — 2Department of Physics, Graduate School of Science, Osaka University, Toyonaka 560-0043, Japan — 3Max Planck Institute for Chemical Physics of Solids, Dresden, Germany

CeRh2As2 is a new heavy-fermion superconductor (TC≃ 0.25 K) which crystallizes in the CaBe2Ge2-type structure where inversion symmetry is locally broken at the Ce site. It is discussed to be a model system to investigate the influence of Rashba-type interactions on heavy-fermion superconductivity. We present results of optical reflectivity on CeRh2As2 and LaRh2As2 for temperatures down to 10 K. In the far-infrared energy region CeRh2As2 shows a strong spectral weight redistribution with decreasing temperature which is a typical feature found in heavy-fermion materials. The spectra of LaRh2As2 show an unexpected strong temperature dependence which has not been observed in other counterparts of heavy-fermion materials. The phonon peaks of both compounds show unusually strong softening. Furthermore, the phonon frequency is higher in the Ce-system than in the La-system, in contrast to expectation. We discuss these observations in terms of the lack of local inversion symmetry in the crystal structure.

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