Tuning Competing Ground States in LuFe<sub>4</sub>Ge<sub>2</sub> Using External Pressure
ORAL
Abstract
Exotic phenomena and unconventional phases occur at regions of competing energy scales in correlated materials, especially in systems with magnetic frustration. Here, we investigate LuFe4Ge2 under external pressure in order to better understand the interplay between competing ground states. LuFe4Ge2 is a frustrated, itinerant magnetic system with antiferromagnetic (AFM) ordering accompanied by a structural transition at 36 K. The pressure dependence of the magneto-elastic transition in LuFe4Ge2 has been investigated using electrical transport, ac magnetic susceptibility, X-ray diffraction, Mössbauer, and muon-spin resonance (μSR) measurements under external pressure. External pressure suppresses the first-order magnetic transition (AFM1) at around 1.8 GPa, while the structural transition is largely unaffected by pressure. A new pressure-induced magnetic phase is confirmed by Mössbauer and μSR experiments. Mössbauer investigations indicate that the high pressure phase is also antiferromagnetically ordered (AFM2), with a different size of the ordered moment and/or a different magnetic structure. Further studies to understand the pressure-induced phase and the interplay between magnetic and structural phase transitions are under way.
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Presenters
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Ajeesh Mukkattu Omanakuttan
- Max Planck Institute for Chemical Physics of Solids