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

P. A. Goddard, J. Singleton, A. L. Lima Sharma, E. Morosan, S. J. Blundell, S. L. Bud’ko, and P. C. Canfield
Phys. Rev. B 75, 094426 – Published 26 March 2007

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 55T 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.

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  • Received 23 January 2007

DOI:https://doi.org/10.1103/PhysRevB.75.094426

©2007 American Physical Society

Authors & Affiliations

P. A. Goddard1,2, J. Singleton2, A. L. Lima Sharma2,*, E. Morosan3,†, S. J. Blundell1, S. L. Bud’ko3, and P. C. Canfield3

  • 1Clarendon Laboratory, Oxford University, Parks Road, Oxford OX1 3PU, United Kingdom
  • 2National High Magnetic Field Laboratory, Los Alamos National Laboratory, MS-E536, Los Alamos, New Mexico 87545, USA
  • 3Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

  • *Also at RIKEN, 2-1 Horosawa, Wako-shi, 351-0198, Japan.
  • Also at Department of Chemistry, Princeton University, NJ 08540.

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Issue

Vol. 75, Iss. 9 — 1 March 2007

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