Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 72: Poster Session: Correlated Electrons
TT 72.73: Poster
Mittwoch, 14. März 2018, 15:00–19:00, Poster B
Strain-induced metal-to-insulator transition in LiV2O4 thin films — •Ulrike Niemann1, Daigorou Hirai2, and Hidenori Takagi1,2 — 1Max Planck Institute for Solid State Research, Stuttgart, Germany — 2University of Tokyo, Tokyo, Japan
The spinel compound LiV2O4 is well-known for its exotic heavy fermion behaviour and has therefore been subject to several studies, addressing the origin of the heavy fermion phase [1]. Repeatedly, geometric frustration with regard to the charge and spin arrangement on the vanadium sides was discussed as a possible alternative to a dense Kondo system scenario. However, the difficulties in growing significantly large single crystals of high quality, limit the verification of discussed models.
We fabricated single-crystalline thin films of LiV2O4 on SrTiO3, LSAT and MgO substrates using pulsed laser deposition [2]. The heavy fermion behaviour of bulk LiV2O4 is well-reproduced in relaxed films on SrTiO3 substrates, giving the opportunity to explore the heavy fermion phase in area-vice significantly larger single crystals. In contrast, an insulating phase was found in strained LiV2O4 thin films on MgO substrates, supporting the importance of geometric frustration for the appearance of heavy fermions in this particular compound. On the poster, we discuss the thin film fabrication and the effect of epitaxial strain on heavy fermions in LiV2O4 in detail.
C. Urano et al., Phys. Rev. Lett. 85, 1052 (2000).
U.Niemann, D. Hirai, H. Takagi (submitted)