Spin ice: magnetic excitations without monopole signatures using muon spin rotation.

Dunsiger, S R; Aczel, A A; Arguello, C; Dabkowska, H; Dabkowski, A; Du, M-H; Goko, T; Javanparast, B; Lin, T; Ning, F L; Noad, H M L; Singh, D J; Williams, T J; Uemura, Y J; Gingras, M J P; Luke, G M

Dunsiger, S R; Aczel, A A; Arguello, C; Dabkowska, H; Dabkowski, A; Du, M-H; Goko, T; Javanparast, B; Lin, T; Ning, F L; Noad, H M L; Singh, D J; Williams, T J; Uemura, Y J; Gingras, M J P; Luke, G M.

Afiliación

Dunsiger SR; Physik Department, Technische Universität München, Garching, Germany. sarah.dunsiger@frm2.tum.de

Phys Rev Lett ; 107(20): 207207, 2011 Nov 11.

Article en En | MEDLINE | ID: mdl-22181768

RESUMEN

Theory predicts the low temperature magnetic excitations in spin ices consist of deconfined magnetic charges, or monopoles. A recent transverse-field (TF) muon spin rotation (µSR) experiment [S. T. Bramwell et al., Nature (London) 461, 956 (2009)] reports results claiming to be consistent with the temperature and magnetic field dependence anticipated for monopole nucleation-the so-called second Wien effect. We demonstrate via a new series of µSR experiments in Dy(2)Ti(2)O(7) that such an effect is not observable in a TF µSR experiment. Rather, as found in many highly frustrated magnetic materials, we observe spin fluctuations which become temperature independent at low temperatures, behavior which dominates over any possible signature of thermally nucleated monopole excitations.

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Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2011 Tipo del documento: Article País de afiliación: Alemania Pais de publicación: Estados Unidos

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