Berlin 2024 – scientific programme
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MA: Fachverband Magnetismus
MA 40: Frustrated Magnets II
MA 40.5: Talk
Thursday, March 21, 2024, 16:00–16:15, H 1058
Complex magnetic order and inverse magnetic melting in Ce3TiSb5 — •Simon Flury1,3, Wolfgang Josef Simeth2, Marc Janoschek1,3, and Yongkang Luo4 — 1University of Zurich, Zurich, Switzerland — 2Los Alamos National Laboratory, Los Alamos, New Mexiko — 3Paul Scherrer Institut, Villigen, Switzerland — 4Huazhong University of Science and Technology, Wuhan, China
We report high-resolution neutron diffraction on the new heavy fermion material Ce3TiSb5. Ce3TiSb5 exhibits an antiferromagnetic order below TN = 5.5 K. Our specific heat and magnetic susceptibility measurements reveal a phase diagram with three distinct magnetic phases. Using neutron diffraction we study the magnetic structure throughout the phase diagram, and uncover a multi-k spin structure in the intermediate field phase. Magnetic multi-k structures are of current interest because they are an important ingredient for topologically non-trivial properties. Finally, our measurements demonstrate that the high-field magnetic phase exhibits inverse melting, where the magnetically ordered state becomes disordered upon cooling. This is a highly unconventional behavior and suggests that the complex magnetic order of Ce3TiSb5 is driven via the competition of several degrees of freedom.
Keywords: inverse-melting; re-entrance; multi-Q; frustration; magnetism