Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 6: Frustrated Magnets - Spin Liquids (joint session TT/MA)

MA 6.2: Vortrag

Montag, 1. April 2019, 15:15–15:30, Theater

MIEZE spectroscopy of spin dynamics and crystal field excitations in Tb2Ti2O7 — •Andreas Wendl1, Steffen Säubert1,2, Christian Franz2, Olaf Soltwedel1,4, Johanna Jochum2,5, Prabhakaran Dharmalingam3, Andrew Boothroyd3, and Christian Pfleiderer11Technische Universität München, Garching, Germany — 2Heinz Maier-Leibnitz Zentrum (MLZ), Garching, Germany — 3Clarendon Laboratory, University of Oxford, United Kingdom — 4Technische Universität Darmstadt, Darmstadt, Germany — 5Bayerisches Geoinstitut, Bayreuth, Germany

The nature of the spin liquid ground state in the cubic rare earth pyrochlore oxide Tb2Ti2O7 has been attracting great interest for many years, where recent studies suggest a prominent role of magneto-elastic crystal field - phonon interactions [1,2]. We present measurements of the spin dynamics of Tb2Ti2O7 by means of the Modulation of IntEnsity by Zero Effort technique (MIEZE) [3], representing an implementation of high-resolution neutron spin echo suitable for depolarizing sample conditions. Our data of the intermediate scattering function cover time-scales of over seven orders of magnitude between 1 fs and 1 ns, corresponding to an energy spectrum from the meV to neV regime. We find strong paramagnetic fluctuations as well as crystal field transitions at elevated temperatures, shedding new light on the low-lying spin dynamics.
Constable et al., Phys. Rev. B, 95, 020415(R) (2017)
Fennell et al. Phys. Rev. Lett., 112, 017203 (2014)
Franz and Schröder, J. Large-Scale Res. Facil. JLSRF 1, 14 (2015)

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