μ SR study of the triangular Ising antiferromagnet ErMgGaO4

Y. Cai, C. Lygouras, G. Thomas, M. N. Wilson, J. Beare, S. Sharma, C. A. Marjerrison, D. R. Yahne, K. A. Ross, Z. Gong, Y. J. Uemura, H. A. Dabkowska, G. M. Luke

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Abstract

We present a detailed magnetic study of the triangular antiferromagnet ErMgGaO4. A point charge calculation under the single ion approximation reveals a crystal field ground state doublet with a strong Ising-like behavior of the Er3+ moment along the c axis. Magnetic susceptibility and specific heat measurements indicate no presence of magnetic transitions above 0.1 K and no evidence of residual entropy as the temperature approaches zero. Zero field (ZF) μSR measurements shows no sign of static uniform or random field and longitudinal field (LF) μSR measurements exhibit persistent spin fluctuations down to our lowest temperature of 25 mK. Our results provide evidence of a quantum spin liquid state in the triangular antiferromagnet ErMgGaO4.

Original languageEnglish
Article number094432
JournalPhysical Review B
Volume101
Issue number9
DOIs
StatePublished - Mar 1 2020
Externally publishedYes

Funding

We greatly appreciate the support of personnel at TRIUMF during the measurements. Work at McMaster was supported by the Natural Sciences and Engineering Research of Council of Canada.

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