Separation of energy scales in the kagome antiferromagnet TmAgGe: A magnetic-field-orientation study up to 55 T

TitleSeparation of energy scales in the kagome antiferromagnet TmAgGe: A magnetic-field-orientation study up to 55 T
Publication TypeJournal Article
Year of Publication2007
AuthorsGoddard PA, Singleton J, Sharma ALL, Morosan E, Blundell SJ, Bud'ko SL, Canfield PC
Journal TitlePhysical Review B
Volume75
Pages094426
Date PublishedMar
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberISI:000245328500064
Abstract

TmAgGe is an antiferromagnet in which the spins are confined to distorted kagome-like planes at low temperatures. We report angle-dependent measurements of the magnetization M in fields of up to 55 T that show that there are two distinct and separate energy scales present in TmAgGe, each responsible for a set of step-like metamagnetic transitions: weak exchange interactions and strong crystalline-electric-field (CEF) interactions. Simulations of M using a three-dimensional, free-energy minimization technique allow us to specify the physical origin of the metamagnetic transitions in low, in-plane fields. We also show that the transitions observed with the field perpendicular to the kagome planes are associated with the CEF-split multiplet of Tm.

DOI10.1103/PhysRevB.75.094426
Alternate JournalPhys. Rev. B