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Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 100: Frustrated Magnets - Pyrochlore Oxides

TT 100.1: Vortrag

Donnerstag, 15. März 2018, 15:30–15:45, H 3005

Orientation Dependence of the Magnetic Phase Diagram of Yb2Ti2O7 — •Steffen Säubert1,2, Christopher Duvinage1, Allen Scheie3, Jonas Kindervater3, Hitesh Changlani3, Shu Zhang3, Seyed Koohpayeh3, Oleg Tchernyshyov3, Collin Broholm3,4,5, and Christian Pfleiderer11Physik Department, Technische Universität München, Germany — 2Heinz Maier-Leibnitz Zentrum, Technische Universität München, Germany — 3Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University, USA — 4NIST Center for Neutron Research, National Institute of Standards and Technology, USA — 5Department of Materials Science and Engineering, Johns Hopkins University, USA

The magnetic pyrochlore oxide Yb2Ti2O7 received a lot of attention in recent years, as strong transverse quantum fluctuations significantly influence the system, and since the nature of its ground state is still under debate to host a spin liquid quantum state, i.e. quantum spin ice, at low temperatures. We report the orientation dependence of the magnetic phase diagram of Yb2Ti2O7, inferred from magnetometry down to millikelvin temperatures, and further address the question of the ground state of Yb2Ti2O7. The magnetic phase diagram for externally applied field shows an unusual field dependence of a first-order phase boundary, notably an applied field initially increases the ordering temperature when applied parallel to the crystalline ⟨ 111 ⟩ or ⟨ 110 ⟩ axes. This unusual field dependence is absent for field along ⟨ 100 ⟩. The zero-field ground state was found to be of ferrimagnetic order, with spins slightly splayed away from one of the six ⟨ 100 ⟩ directions.

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