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dc.contributor.author
Napolitano, Lia M. B.
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Nascimento, Otaciro R.
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Cabaleiro, Santiago
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Castro, Jesus
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Calvo, Rafael
dc.date.available
2017-07-04T19:08:47Z
dc.date.issued
2008-12
dc.identifier.citation
Napolitano, Lia M. B.; Nascimento, Otaciro R.; Cabaleiro, Santiago; Castro, Jesus; Calvo, Rafael; Isotropic and anisotropic spin-spin interactions and a quantum phase transition in a dinuclear Cu(II) compound; American Physical Society; Physical Review B; 77; 21; 12-2008; 2144231-21442313
dc.identifier.issn
1098-0121
dc.identifier.uri
http://hdl.handle.net/11336/19509
dc.description.abstract
We report electron-paramagnetic resonance (EPR) studies at 9.5 GHz (X band) and 34 GHz (Q band) of powder and single-crystal samples of the compound Cu2[TzTs]4 [N-thiazol-2-yltoluenesulfonamidatecopper(II)], C40H36Cu2N8O8S8, having copper(II) ions in dinuclear units. Our data allow determining an antiferromagnetic interaction Jo = (-113 +/- 1) cm-1 (Hex = -JoS1·S2) between Cu(II) ions in the dinuclear unit and the anisotropic contributions to the spin-spin coupling matrix D (Hani = S1·D·S2), a traceless symmetric matrix with principal values D/4 = (0.198 +/- 0.003) cm-1 and E/4 = (0.001 +/- 0.003) cm-1 arising from magnetic dipole-dipole and anisotropic exchange couplings within the units. In addition, the single crystal EPR measurements allow detecting and estimating very weak exchange couplings between neighbor dinuclear units, with an estimated magnitude Jo = (0.060 +/- 0.015) cm-1. The interactions between a dinuclear unit and the “environment” of similar units in the structure of the compound produce a spin dynamics that averages out the intradinuclear dipolar interactions. This coupling with the environment leads to decoherence, a quantum phase transition that collapses the dipolar interaction when the isotropic exchange coupling with neighbor dinuclear units equals the magnitude of the intradinuclear dipolar coupling. Our EPR experiments provide a new procedure to follow the classical exchange-narrowing process as a shift and collapse of the linestructure (not only as a change of the resonance width), which is described with general but otherwise simple theories of magnetic resonance. Using complementary procedures, our EPR measurements in powder and single-crystal samples allow measuring simultaneously three types of interactions differing by more than three orders of magnitude (between 113 cm-1 and 0.060 cm-1).
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
American Physical Society
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject.classification
Física de los Materiales Condensados
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Ciencias Físicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Isotropic and anisotropic spin-spin interactions and a quantum phase transition in a dinuclear Cu(II) compound
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-05-22T14:02:46Z
dc.journal.volume
77
dc.journal.number
21
dc.journal.pagination
2144231-21442313
dc.journal.pais
Estados Unidos
dc.journal.ciudad
Washington
dc.description.fil
Fil: Napolitano, Lia M. B.. Universidade de Sao Paulo; Brasil
dc.description.fil
Fil: Nascimento, Otaciro R.. Universidade de Sao Paulo; Brasil
dc.description.fil
Fil: Cabaleiro, Santiago. Universidad de Vigo; España
dc.description.fil
Fil: Castro, Jesus. Universidad de Vigo; España
dc.description.fil
Fil: Calvo, Rafael. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentina
dc.journal.title
Physical Review B
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1103/PhysRevB.77.214423
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://journals.aps.org/prb/abstract/10.1103/PhysRevB.77.214423
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