Dresden 2017 – wissenschaftliches Programm

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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 Klauss11Institute 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 TN = 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 TN 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 TN 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.

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