# 2019 CAP Congress / Congrès de l'ACP 2019

2-7 June 2019
Simon Fraser University
America/Vancouver timezone
Welcome to the 2019 CAP Congress Program website! / Bienvenue au siteweb du programme du Congrès de l'ACP 2019 !

## Discovery and Characterization of New Frustrated Magnetic Systems

3 Jun 2019, 14:30
15m
SCC 9000 (Simon Fraser University)

### SCC 9000

#### Simon Fraser University

Oral (Non-Student) / Orale (non-étudiant(e)) Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM)

### Speaker

Graeme Luke (McMaster University)

### Description

Magnetic frustration occurs when a material’s lattice geometry prevents it from finding the classical ground state which minimizes pairwise magnetic interaction energies. In such situations, novel ground states with exotic properties can emerge: examples include classical and quantum spin ice and classical and quantum spin liquids. Many different states and excitations have been predicted theoretically, but the study of their physical properties requires real physical realizations of these models.

We have been searching for new geometrically frustrated magnetic materials to broaden the range of materials that can be studied to identify new ground states and novel excitations. I will describe our work to synthesis a stacked triangular system ErMgGaO$_4$ and the related garnet Er$_3$Ga$_5$O$_{12}$, which we have characterized with magnetic susceptibility, specific heat, muon spin relaxation and neutron scattering. We find that the spins in remain dynamic down to our lowest temperatures (50mK), making this system a candidate spin liquid.

I will also describe our ongoing work on new materials whose lattice is derived from the highly frustrated pyrochlore and kagome lattices where we have successfully synthesized single crystal and polycrystalline specimens of several new compounds.

### Primary authors

Graeme Luke (McMaster University) Mr Yipeng Cai (McMaster University) Mr James Beare (McMaster University) Ms Georgia Thomas (McMaster University) Dr Adam Aczel (Oak Ridge National Laboratory) Ms Casey Marjerisson (McMaster University)

### Presentation Materials

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