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  The emergence of classical behaviour in magnetic adatoms

Delgado, F., Loth, S., Zielinski, M., & Fernández-Rossier, J. (2015). The emergence of classical behaviour in magnetic adatoms. EPL, 109(5): 57001. doi:10.1209/0295-5075/109/57001.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0026-B0FA-E Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-0BBA-1
Genre: Journal Article

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1405.3304v1.pdf (Preprint), 3MB
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http://dx.doi.org/10.1209/0295-5075/109/57001 (Publisher version)
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http://arxiv.org/abs/1405.3304 (Preprint)
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 Creators:
Delgado, F.1, 2, 3, Author
Loth, S.4, 5, Author              
Zielinski, M.6, Author
Fernández-Rossier, J.1, Author
Affiliations:
1International Iberian Nanotechnology Laboratory (INL) - Av. Mestre José Veiga, P-4715-310 Braga, Portugal , ou_persistent22              
2Centro de Física de Materiales, CSIC- UPV/EHU - Paseo Manuel de Lardizabal 5, E-20018 San Sebastián, Spain , ou_persistent22              
3IKERBASQUE, Basque Foundation for Science - E-48013 Bilbao, Spain, ou_persistent22              
4Dynamics of Nanoelectronic Systems, Independent Research Groups, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938290              
5Max Planck Institute for Solid State Research, ou_persistent22              
6Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University Grudziadzka 5, PL-87-100 Torun, Poland , ou_persistent22              

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Free keywords: Condensed matter: electrical, magnetic and optical; PACS numbers: 72.15.Qm Scattering mechanisms and Kondo effect, 75.78.-n 75.10.Jm Quantized spin models
 Abstract: A wide class of nanomagnets shows striking quantum behaviour, known as quantum spin tunnelling (QST): instead of two degenerate ground states with opposite magnetizations, a bonding-antibonding pair forms, resulting in a splitting of the ground-state doublet with wave functions linear combination of two classically opposite magnetic states, leading to the quenching of their magnetic moment. Here we study how QST is destroyed and classical behaviour emerges in the case of magnetic adatoms, where, contrary to larger nanomagnets, the QST splitting is in some instances bigger than temperature and broadening. We analyze two different mechanisms for the renormalization of the QST splitting: Heisenberg exchange between different atoms, and Kondo exchange interaction with the substrate electrons. Sufficiently strong spin-substrate and spin-spin coupling renormalize the QST splitting to zero allowing the environmental decoherence to eliminate superpositions between classical states, leading to the emergence of spontaneous magnetization. Importantly, we extract the strength of the Kondo exchange for various experiments on individual adatoms and construct a phase diagram for the classical to quantum transition.

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Language(s): eng - English
 Dates: 2014-12-102015-02-182015-03-092015-03
 Publication Status: Published in print
 Pages: 6
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1209/0295-5075/109/57001
arXiv: 1405.3304
 Degree: -

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Title: EPL
  Other : Europhysics Letters
Source Genre: Journal
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Publ. Info: Bristol : IoPP
Pages: - Volume / Issue: 109 (5) Sequence Number: 57001 Start / End Page: - Identifier: Other: 0295-5075
CoNE: /journals/resource/0295-5075