Size-induced superantiferromagnetism with reentrant spin-glass behavior in metallic nanoparticles of TbCu${}_{2}$

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Size-induced superantiferromagnetism with reentrant spin-glass behavior in metallic nanoparticles of TbCu $_{2}$

C. Echevarria-Bonet, D. P. Rojas, J. I. Espeso, J. Rodríguez Fernández, L. Rodríguez Fernández, P. Gorria, J. A. Blanco, M. L. Fdez-Gubieda, E. Bauer, G. André, and L. Fernández Barquín

Phys. Rev. B 87, 180407(R) – Published 24 May 2013

Abstract

An unusual $4 f$ -superantiferromagnetic state characterized by simultaneous antiferromagnetic and spin-glass behaviors induced by particle-size reduction is revealed in metallic nanoparticles ( $\approx$ 9 nm) of TbCu $_{2}$ . The Néel temperature is 46 K and the glassy freezing is below $\approx$ 9 K and governed by a critical slowing down process. Neutron diffraction at 1.8 K establishes the superantiferromagnetism. The latter is settled by the nanoparticle moments and the freezing mechanism is provided by the surface spins.

Received 24 January 2013

DOI:https://doi.org/10.1103/PhysRevB.87.180407

Authors & Affiliations

C. Echevarria-Bonet¹, D. P. Rojas², J. I. Espeso¹, J. Rodríguez Fernández¹, L. Rodríguez Fernández³, P. Gorria⁴, J. A. Blanco⁴, M. L. Fdez-Gubieda⁵, E. Bauer⁶, G. André⁷, and L. Fernández Barquín¹

¹Departamento CITIMAC, Universidad de Cantabria, 39005 Santander, Spain
²Departamento de Física e Instalaciones Aplicadas-ETSAM, 28040 Madrid, Spain
³SERMET, Universidad de Cantabria, 39005 Santander, Spain
⁴Departamento Física, Universidad de Oviedo, 33007 Oviedo, Spain
⁵Depto. Electricidad y Electrónica, Universidad del País Vasco (UPV/EHU), 48940 Leioa and BCMaterials, Building No. 500, Technological Park of Biscay, 48160 Derio, Spain
⁶Institut für Festkörperphysik, Technische Universität Wien, 1040 Wien, Austria
⁷Laboratoire Léon Brillouin, CEA-SACLAY, 91191 Gif-sur-Yvette Cedex, France

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Issue

Vol. 87, Iss. 18 — 1 May 2013

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