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Journal Article

Linear-in-Frequency Optical Conductivity in GdPtBi due to Transitions near the Triple Points

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Yaresko,  A.
Department Quantum Materials (Hidenori Takagi), Max Planck Institute for Solid State Research, Max Planck Society;
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Hütt, F., Yaresko, A., Schilling, M., Shekhar, C., Felser, C., Dressel, M., et al. (2018). Linear-in-Frequency Optical Conductivity in GdPtBi due to Transitions near the Triple Points. Physical Review Letters, 121(17): 176601.


Cite as: https://hdl.handle.net/21.11116/0000-000E-D4F6-D
Abstract
The complex optical conductivity of the half-Heusler compound GdPtBi is measured in a frequency range from 20 to 22 000 cm(-1) (2.5 meV-2.73 eV) at temperatures down to 10 K in zero magnetic field. We find the real part of the conductivity, sigma(1) (omega), to be almost perfectly linear in frequency over a broad range from 50 to 800 cm(-1) (similar to 6-100 meV) for T <= 50 K. This linearity strongly suggests the presence of three-dimensional linear electronic bands with band crossings (nodes) near the chemical potential. Band-structure calculations show the presence of triple points, where one doubly degenerate and one nondegenerate band cross each other in close vicinity of the chemical potential. From a comparison of our data with the optical conductivity computed from the band structure, we conclude that the observed nearly linear sigma(1)(omega) originates as a cumulative effect from all the transitions near the triple points.