ACTA

Thermodynamic Properties of Geometrically Frustrated S=1/2 XY Antiferromagnet Er₂Sn₂O₇

N. Al Ghamdi^a, A. Orendáčová^a, V. Pavlík^b, M. Orendáč ^a
^aInstitute of Physics, Faculty of Sciences, P. J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia
^bInstitute of Experimental Physics SAS, Watsonova 47, 040 01 Košice, Slovakia

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The magnetic susceptibility, specific heat and entropy of geometrically frustrated S=1/2 XY antiferromagnet Er₂Sn₂O₇ are reported. It is shown, that temperature dependence of magnetic susceptibility above nominally 10 K is governed by crystal field effects. Systematic study of specific heat in magnetic fields up to 7 T enabled the estimation of exchange coupling, J/k<<4.6 K. Investigation of isothermal change of magnetic entropy upon magnetization from 1 T to 7 T revealed the absence of enhanced magnetocaloric effect. The obtained results suggest that frustration parameter f ≈140 proposed for Er₂Sn₂O₇ earlier may be significantly overestimated.

DOI: 10.12693/APhysPolA.126.264
PACS numbers: 75.10.Dg, 75.50.Ee, 75.30.Sg