Temporal and field evolution of spin excitations in the disorder-free triangular antiferromagnet Na2BaCo(PO4)2

by Dr Suheon Lee (Sungkyunkwan University)

Thursday 29 Apr 2021, 10:00 → 11:30 Asia/Shanghai

ONLINE

Abstract

The search for quantum spin liquids (QSLs) is one of the pursuing goals in the condensed matter physics because of the potential to observe the exotic state of matter, including quasiparticle fractionalization, emergent gauge, long-range entanglement, and topological order. Historically, triangular Heisenberg antiferromagnets (THAFs) have been envisioned as the first conceptual model system of QSLs. However, in general, THAFs host a 120° long-range magnetic order with strong quantum fluctuations and many-body interaction effects. Up to now, a range of S=1/2 THAFs has been investigated to realize QSL, yet no triangular compound is known to fulfill the experimental criteria for identifying QSLs.

In this talk, I will present the comprehensive muon spin relaxation/rotation (μSR) and nuclear magnetic resonance (NMR) results of the newly discovered disorder-free THAF Na₂BaCo(PO₄)₂. Our findings uncover the temporal, thermal, and magnetic-field characteristics of the magnetic excitations in the triangular-lattice QSL candidate Na₂BaCo(PO₄)₂.

Biography

Postdoc - Institute for Basic Science (IBS) Center for Integrated Nanostructure Physics, Sungkyunkwan University: 03/2021 - Present

Postdoc - Quantum Magnetism Laboratory, Chung-Ang University: 09/2018 - 02/2021

Visiting researcher - ISIS Neutron and Muon Source: 02/2019 - 04/2020

Ph. D. in physics - Chung-Ang University: 03/2013 - 08/2018 (Supervisor: Prof. Dr. Kwang-Yong Choi)

Thesis title: Muon spin relaxation/rotation studies of strongly geometrically frustrated magnets

Division

Condensed Matter

Other information

Vedio Link: https://vshare.sjtu.edu.cn/open/82207cff4156f0922b9980627e1a3591