Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 70: Correlated Electrons: Charge Order

TT 70.4: Vortrag

Freitag, 20. März 2020, 10:15–10:30, HSZ 103

Strain-induced charge ordering in LiV2O4: Phase competition in a geometrically frustrated system — •Ulrike Niemann1,2, Yu-Mi Wu1, Minu Kim1,2, and Hidenori Takagi1,2,31Max Planck Institute for Solide State Research, Stuttgart, Germany — 2Institute for Functional Matter and Quantum Technologies, University of Stuttgart, Germany — 3Department of Physics, University of Tokyo, Japan

LiV2O4 has been attracting considerable interest over two decades as the first heavy fermion system hosted by a 3d transition metal oxide. Nevertheless, the underlying physics, leading to this exotic heavy fermion state is yet unknown, but is frequently discussed in the framework of geometric frustration.
We stabilised thin films of LiV2O4 with different levels of strain-induced lattice deformations in order to directly probe the importance of the geometric frustration on the heavy fermion phase. Under such anisotropic strain, we found a transition from a heavy-fermion metal in a fully relaxed thin film to a charge-ordered insulator in a moderately strained thin film, proving the underlying phase competition and criticality. This demonstrates the importance of geometric frustration inherited in the spinel lattice as origin of this unconventional heavy fermion and further establishes LiV2O4 as an ideal model system for tuneable charge ordering.

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