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The role of structural defects in frustrated magnetism

Pyrochlore systems are ideally suited to the exploration of geometrical frustration in three dimensions, and their rich phenomenology encompasses topological order and fractional excitations. The sample dependence of their physical properties and the identification of different magnetic ground states for nominally stoichiometric samples clearly points towards the importance of low levels of structural disorder. Quantum spin liquids have been elusive experimentally, in part because disorder induces competing glassy states instead of entangled ones. However, recent theoretical predictions suggest that it is possible to tune to quantum spin liquids via the controlled introduction of structural disorder. Here I shall describe how diffuse neutron scattering studies have been used to determine the decisive role of structural defects in the magnetism of frustrated pyrochlores. In the case of the classical spin ice dysprosium titanate we have shown that oxygen vacancies are responsible for slowing down the long-time monopole dynamics at sub-Kelvin temperatures. For the quantum analogue ytterbium titanate, samples in which the oxygen vacancies have been eliminated by annealing in oxygen exhibit a transition to a ferromagnetic phase, and this is the true magnetic ground state. However, the presence of low levels of oxygen vacancies stabilizes a quantum spin liquid phase.

Seminar: Neutronen in Forschung und Industrie

Datum13.05.2019
Uhrzeit14:30 - 15:30 Uhr
OrtGarching
RaumHS 3 (Physik Department)
SprecherProf. Jon Goff, University of Royal Holloway
Veranstalter

TUM / FRM II


Kontakt

Ansprechpartner

Dr. Markos Skoulatos und Dr. Alexandros Koutsioumpas

E-Mail Markos.Skoulatos@frm2.tum.de
URL

https://indico.frm2.tum.de/event/174/

MLZ ist eine Kooperation aus:

Technische Universität München> Technische Universität MünchenHelmholtz-Zentrum Hereon> Helmholtz-Zentrum Hereon
Forschungszentrum Jülich> Forschungszentrum Jülich

MLZ ist Mitglied in:

LENS> LENSERF-AISBL> ERF-AISBL

MLZ in den sozialen Medien: