Absence of long-range magnetic ordering in the pyrochlore compound Er2Sn2O7

The low temperature behaviour of powder Er2Sn2O7 samples has been studied by magnetic susceptibility, heat capacity, and neutron scattering experiments. We report here the absence of magnetic ordering down to 100 mK. Anomalies in the heat capacity can be accounted for through an analysis of the crys...

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Veröffentlicht in:	Journal of physics. Condensed matter 2011-09, Vol.23 (38), p.382201-382201
Hauptverfasser:	Sarte, P M, Silverstein, H J, Van Wyk, B T K, Gardner, J S, Qiu, Y, Zhou, H D, Wiebe, C R
Format:	Artikel
Sprache:	eng
Schlagworte:	Condensed matter: electronic structure, electrical, magnetic, and optical properties Critical-point effects, specific heats, short-range order Exact sciences and technology Magnetic properties and materials Physics Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.) Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)
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Zusammenfassung:	The low temperature behaviour of powder Er2Sn2O7 samples has been studied by magnetic susceptibility, heat capacity, and neutron scattering experiments. We report here the absence of magnetic ordering down to 100 mK. Anomalies in the heat capacity can be accounted for through an analysis of the crystal field spectrum observed by inelastic neutron scattering spectroscopy. These new measurements on Er2Sn2O7 suggest a new lower bound for the frustration index of f = \|Θ(CW)\|/T(N) = 14/0.1 = 140, placing this compound into a highly frustrated regime.
ISSN:	0953-8984 1361-648X
DOI:	10.1088/0953-8984/23/38/382201