Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 17: Poster Session Correlated Electrons 1

TT 17.7: Poster

Montag, 16. März 2020, 15:00–19:00, P2/EG

Monte Carlo Study of Field-Induced Multipolar Phases in the Kondo Material PrTi2Al20 — •Frederic Freyer1, Simon Trebst1, SungBin Lee2, Yong Baek Kim3, and Arun Paramekanti31University of Cologne, 50937, Germany — 2Korea Advanced Institute of Science and Technology, Daejeon, 34141, Korea — 3University of Toronto, Toronto, Ontario, Canada M5S 1A7

Multispin interactions have long been appreciated as a possible microscopic driver for the formation of spin liquids or other forms of unconventional magnetic ordering, e.g. in the proximity of the Mott transition. Here we discuss the role of such multispin interactions in the Kondo material PrTi2Al20, which exhibits a rich phase phase diagram including intertwined quadrupolar orders, superconductivity and non-Fermi-liquid behavior. Our focus is on magnetic-field induced phase transitions in the quadrupolar ordered state, which have recently been experimentally probed by the Nakatsuji group. Via extensive Monte Carlo simulations we demonstrate that three-spin interactions between the local moments play an important role to explain the observed field dependence of the quadrupolar regime, in the context of a relatively simple O(2) spin model.

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