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TT: Fachverband Tiefe Temperaturen

TT 19: Poster Session: Correlated Electrons 1

TT 19.20: Poster

Montag, 20. März 2017, 15:00–19:00, P2-EG

Magnetic phase diagram of LuFe₄Ge₂ under high pressure probed by µSR — •Shanu Dengre¹, Rajib Sarkar¹, M.O. Ajeesh², Philipp Materne¹, Rustem Khasanov³, Katharina Weber², Christoph Geibel², Michael Nicklas², and Hans-Henning Klauss¹ — ¹Institute for Solid State Physics, TU-Dresden, 01069-Dresden, Germany — ²Max Planck Institute for Chemical Physics of Solids, 01187-Dresden, Germany — ³Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, CH-5232-Villigen, Switzerland

LuFe₄Ge₂ is a geometrically frustrated magnetic system with antiferromagnetic (AFM) ordering at T_N = 36 K. In this work, we used µSR spectroscopy to study the pressure evolution of magnetic phase diagram of LuFe₄Ge₂. Previous electrical transport investigations showed a continuous suppression of T_N to zero temperature at 1.7 GPa and suggested the existence of a second pressure-induced magnetic phase. Our transverse field - µSR experiments find a 100% magnetic volume below T_N in the low pressure AFM phase. Further, they prove the presence of a second long-range antiferromagnetically ordered phase at higher pressures and also indicate that the complete sample volume is magnetically ordered in this phase. The obtained ordering temperatures are in good agreement with the electrical resistivity data. The low temperature muon precision frequency does not change between zero and 2.25 GPa, which is consistent with a similar size of the ordered moment in the two different magnetic phases.