Size-induced superantiferromagnetism with reentrant spin-glass behavior in metallic nanoparticles of TbCu2

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URI: http://hdl.handle.net/10902/4394
ISSN: 0031-9007
ISSN: 1079-7114
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Author
Echevarría Bonet, CristinaAutoridad Unican; Rojas Pupo, DanielAutoridad Unican; Espeso Martínez, José IgnacioAutoridad Unican; Rodríguez Fernández, JesúsAutoridad Unican; Rodríguez Fernández, Lidia; Gorria Korres, Pedro; Blanco Rodríguez, Jesús Angel; Fernández-Gubieda, María Luisa; Bauer, Ernst G.; André, Gilles; Fernández Barquín, LuisAutoridad Unican
Date
2013-05-24
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©2013 American Physical Society
Publicado en
Physical Review B. Condensed Matter and Materials Physics, 2013, 87(18), 180407(R)
Publisher
American Physical Society
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Abstract:
An unusual 4f -superantiferromagnetic state characterized by simultaneous antiferromagnetic and spin-glass behaviors induced by particle-size reduction is revealed in metallic nanoparticles (≈ 9 nm) of TbCu 2 . The Néel temperature is 46 K and the glassy freezing is below ≈ 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.
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