Seminar : Search for spin liquids in three-dimensional materials

Title : Search for spin liquids in three-dimensional materials

Speaker : Prof. Harald O. Jeschke from Okayama University

Abstract : 

Highly frustrated magnetic materials may display features of classical or quantum spin liquids. However, such exotic states are hard to identify experimentally. In this seminar, I will discuss how electronic structure calculations can contribute to this problem by establishing reliable information about magnetic Hamiltonians and thus providing a link between crystal structure information and powerful theoretical techniques like pseudo-Fermion functional renormalization group (PFFRG) calculations. I will illustrate this approach in a number of materials: Lu₂Mo₂O₅N₂ is a rare material with a S=1/2 pyrochlore lattice and has a third nearest neighbor coupling that stabilizes rather than weakens a paramagnetic state. The hyperkagome antiferromagnet PbCuTe₂O_6​ can be established as a quantum spin liquid candidate based on excellent agreement between inelastic neutron scattering and PFFRG calculations. The physical picture for the classical spiral spin liquid MnSc₂S₄ can be substantially refined based on a new set of interactions. The investigation of several chromium based spinels with a breathing pyrochlore lattice indicates their proximity to various classical spin liquid phases, with longer-range Heisenberg Hamiltonian interactions playing a prominent role.

Join Zoom Meeting https://oist.zoom.us/j/91338930773?pwd=Vm9TZWZGTEpuazdxb3dsZ3A4bC9FQT09

Meeting ID: 913 3893 0773 (For password, please contact : megumi.ikeda@oist.jp)