Regensburg 2016 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 78: Correlated Electrons: Poster Session
TT 78.56: Poster
Donnerstag, 10. März 2016, 15:00–18:30, Poster D
Angle-Resolved Photoemission Spectroscopy of rare earth LaSb2 — Matteo Michiardi1, •Fabian Arnold1, G. Shwetha2, V. Kanchana2, Vaitheeswaran Ganapathy3, Karl Frederik Faerch Fisher1, Axel Svane1, Marco Bianchi1, Bo Brummerstedt Iversen1, and Philip Hofmann1 — 1Aarhus University, Denmark — 2IIT-Hyderabad, India — 3University of Hyderabad, India
Several rare earth diantimonides have been found to exhibit intriguing electronic properties such as anisotropic linear and non-saturating magnetoresistance. Among these materials, LaSb2 is not only considered for application in magnetoresistive devices but it is also found to be superconducting at low temperatures and it is investigated as candidate material to host charge density wave phases. Despite the several studies on its transport properties, the electronic structure of LaSb2 is still largely unknown. Here we present an angle-resolved photoemission spectroscopy and ab-initio calculation study of LaSb2(001). The observed band structure is found to be in good agreement with theoretical predictions. Our results reveal that LaSb2 is a semimetal with a strongly nested two-dimensional Fermi surface. The low energy spectrum is characterized by four massive hole pockets and by four shallow, strongly directional, electron pockets that exhibit Dirac-like dispersion. We speculate on the possibility that this peculiar electronic structure drives the magnetoresistance to its quantum limit, explaining its unconventional behavior.