Temperature dependence of the effective interdimer exchange interaction in a weakly coupled antiferromagnetic dimer copper compound

Autores
Calvo, Rafael; Santana, Vinicius T.; Nascimento, Otaciro R.
Año de publicación
2017
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We report a variation with temperature T of the effective interdimeric interaction J´eff in the antiferromagnetic (AFM) copper dimeric organic compound Cu2[TzTs]4 (N-thiazol-2-yl-toluenesulfonamidate CuII). This T dependence was obtained from measurements of the effects in the electron paramagnetic resonance (EPR) spectra of the proposed quantum phase transition associated with the exchange-narrowing processes. Cu2[TzTs]4 contains exchange-coupled pairs of CuII spins SA and SB (S = 1/2), with intradimeric AFM exchange coupling J0 = (−115±1) cm−1 (Hex =−J0SA · SB). The variation of the EPR linewidth of single crystals with field orientation around a ?magic angle? where the transitions intersect and the integrated signal intensity of the so-called Upeak of the powder spectrum weremeasured as a function of T. Modeling these data using arguments of exchange narrowing in the adiabatic regime considering the angular variation of the single-crystal spectra and a geometric description, we find that the effective interdimeric coupling |J´eff| associated with the exchange frequency ωex is negligible for T<<|J0/kB| when the units are uncoupled and |J´eff|= (0.080±0.005) cm−1 (|J´eff/J0|= 7.0×10−4) at 298 K.Within this T interval, two ranges of |J´eff| with linear temperature variation but different slopes, with a kink at ∼80 K, are observed and discussed. This T dependence arises from the growing population of the triplet state, and its relevance to the properties of various arrays of dimeric units is discussed. Our experimental procedures and results are compared with those of previous works in ion radical salts and dimeric metal compounds. The relation between the effective coupling |J´eff | and the real interdimeric exchange coupling |J´| related to the chemical paths connecting neighbor units is discussed.
Fil: Calvo, Rafael. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Física del Litoral. Universidad Nacional del Litoral. Instituto de Física del Litoral; Argentina
Fil: Santana, Vinicius T.. Universidade de Sao Paulo; Brasil
Fil: Nascimento, Otaciro R.. Universidade de Sao Paulo; Brasil
Materia
Exchange Coupling
Dimeric Compound
Copper
Epr
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/29490
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/29490
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Temperature dependence of the effective interdimer exchange interaction in a weakly coupled antiferromagnetic dimer copper compoundCalvo, RafaelSantana, Vinicius T.Nascimento, Otaciro R.Exchange CouplingDimeric CompoundCopperEprhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We report a variation with temperature T of the effective interdimeric interaction J´eff in the antiferromagnetic (AFM) copper dimeric organic compound Cu2[TzTs]4 (N-thiazol-2-yl-toluenesulfonamidate CuII). This T dependence was obtained from measurements of the effects in the electron paramagnetic resonance (EPR) spectra of the proposed quantum phase transition associated with the exchange-narrowing processes. Cu2[TzTs]4 contains exchange-coupled pairs of CuII spins SA and SB (S = 1/2), with intradimeric AFM exchange coupling J0 = (−115±1) cm−1 (Hex =−J0SA · SB). The variation of the EPR linewidth of single crystals with field orientation around a ?magic angle? where the transitions intersect and the integrated signal intensity of the so-called Upeak of the powder spectrum weremeasured as a function of T. Modeling these data using arguments of exchange narrowing in the adiabatic regime considering the angular variation of the single-crystal spectra and a geometric description, we find that the effective interdimeric coupling |J´eff| associated with the exchange frequency ωex is negligible for T<<|J0/kB| when the units are uncoupled and |J´eff|= (0.080±0.005) cm−1 (|J´eff/J0|= 7.0×10−4) at 298 K.Within this T interval, two ranges of |J´eff| with linear temperature variation but different slopes, with a kink at ∼80 K, are observed and discussed. This T dependence arises from the growing population of the triplet state, and its relevance to the properties of various arrays of dimeric units is discussed. Our experimental procedures and results are compared with those of previous works in ion radical salts and dimeric metal compounds. The relation between the effective coupling |J´eff | and the real interdimeric exchange coupling |J´| related to the chemical paths connecting neighbor units is discussed.Fil: Calvo, Rafael. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Física del Litoral. Universidad Nacional del Litoral. Instituto de Física del Litoral; ArgentinaFil: Santana, Vinicius T.. Universidade de Sao Paulo; BrasilFil: Nascimento, Otaciro R.. Universidade de Sao Paulo; BrasilAmerican Physical Society2017-08info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/29490Calvo, Rafael; Santana, Vinicius T.; Nascimento, Otaciro R.; Temperature dependence of the effective interdimer exchange interaction in a weakly coupled antiferromagnetic dimer copper compound; American Physical Society; Physical Review B; 96; 064424; 8-2017; 1-72469-99502469-9969CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://link.aps.org/doi/10.1103/PhysRevB.96.064424info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevB.96.064424info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:54:52Zoai:ri.conicet.gov.ar:11336/29490instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 09:54:54.029CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Temperature dependence of the effective interdimer exchange interaction in a weakly coupled antiferromagnetic dimer copper compound
title Temperature dependence of the effective interdimer exchange interaction in a weakly coupled antiferromagnetic dimer copper compound
spellingShingle Temperature dependence of the effective interdimer exchange interaction in a weakly coupled antiferromagnetic dimer copper compound
Calvo, Rafael
Exchange Coupling
Dimeric Compound
Copper
Epr
title_short Temperature dependence of the effective interdimer exchange interaction in a weakly coupled antiferromagnetic dimer copper compound
title_full Temperature dependence of the effective interdimer exchange interaction in a weakly coupled antiferromagnetic dimer copper compound
title_fullStr Temperature dependence of the effective interdimer exchange interaction in a weakly coupled antiferromagnetic dimer copper compound
title_full_unstemmed Temperature dependence of the effective interdimer exchange interaction in a weakly coupled antiferromagnetic dimer copper compound
title_sort Temperature dependence of the effective interdimer exchange interaction in a weakly coupled antiferromagnetic dimer copper compound
dc.creator.none.fl_str_mv Calvo, Rafael
Santana, Vinicius T.
Nascimento, Otaciro R.
author Calvo, Rafael
author_facet Calvo, Rafael
Santana, Vinicius T.
Nascimento, Otaciro R.
author_role author
author2 Santana, Vinicius T.
Nascimento, Otaciro R.
author2_role author
author
dc.subject.none.fl_str_mv Exchange Coupling
Dimeric Compound
Copper
Epr
topic Exchange Coupling
Dimeric Compound
Copper
Epr
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We report a variation with temperature T of the effective interdimeric interaction J´eff in the antiferromagnetic (AFM) copper dimeric organic compound Cu2[TzTs]4 (N-thiazol-2-yl-toluenesulfonamidate CuII). This T dependence was obtained from measurements of the effects in the electron paramagnetic resonance (EPR) spectra of the proposed quantum phase transition associated with the exchange-narrowing processes. Cu2[TzTs]4 contains exchange-coupled pairs of CuII spins SA and SB (S = 1/2), with intradimeric AFM exchange coupling J0 = (−115±1) cm−1 (Hex =−J0SA · SB). The variation of the EPR linewidth of single crystals with field orientation around a ?magic angle? where the transitions intersect and the integrated signal intensity of the so-called Upeak of the powder spectrum weremeasured as a function of T. Modeling these data using arguments of exchange narrowing in the adiabatic regime considering the angular variation of the single-crystal spectra and a geometric description, we find that the effective interdimeric coupling |J´eff| associated with the exchange frequency ωex is negligible for T<<|J0/kB| when the units are uncoupled and |J´eff|= (0.080±0.005) cm−1 (|J´eff/J0|= 7.0×10−4) at 298 K.Within this T interval, two ranges of |J´eff| with linear temperature variation but different slopes, with a kink at ∼80 K, are observed and discussed. This T dependence arises from the growing population of the triplet state, and its relevance to the properties of various arrays of dimeric units is discussed. Our experimental procedures and results are compared with those of previous works in ion radical salts and dimeric metal compounds. The relation between the effective coupling |J´eff | and the real interdimeric exchange coupling |J´| related to the chemical paths connecting neighbor units is discussed.
Fil: Calvo, Rafael. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Física del Litoral. Universidad Nacional del Litoral. Instituto de Física del Litoral; Argentina
Fil: Santana, Vinicius T.. Universidade de Sao Paulo; Brasil
Fil: Nascimento, Otaciro R.. Universidade de Sao Paulo; Brasil
description We report a variation with temperature T of the effective interdimeric interaction J´eff in the antiferromagnetic (AFM) copper dimeric organic compound Cu2[TzTs]4 (N-thiazol-2-yl-toluenesulfonamidate CuII). This T dependence was obtained from measurements of the effects in the electron paramagnetic resonance (EPR) spectra of the proposed quantum phase transition associated with the exchange-narrowing processes. Cu2[TzTs]4 contains exchange-coupled pairs of CuII spins SA and SB (S = 1/2), with intradimeric AFM exchange coupling J0 = (−115±1) cm−1 (Hex =−J0SA · SB). The variation of the EPR linewidth of single crystals with field orientation around a ?magic angle? where the transitions intersect and the integrated signal intensity of the so-called Upeak of the powder spectrum weremeasured as a function of T. Modeling these data using arguments of exchange narrowing in the adiabatic regime considering the angular variation of the single-crystal spectra and a geometric description, we find that the effective interdimeric coupling |J´eff| associated with the exchange frequency ωex is negligible for T<<|J0/kB| when the units are uncoupled and |J´eff|= (0.080±0.005) cm−1 (|J´eff/J0|= 7.0×10−4) at 298 K.Within this T interval, two ranges of |J´eff| with linear temperature variation but different slopes, with a kink at ∼80 K, are observed and discussed. This T dependence arises from the growing population of the triplet state, and its relevance to the properties of various arrays of dimeric units is discussed. Our experimental procedures and results are compared with those of previous works in ion radical salts and dimeric metal compounds. The relation between the effective coupling |J´eff | and the real interdimeric exchange coupling |J´| related to the chemical paths connecting neighbor units is discussed.
publishDate 2017
dc.date.none.fl_str_mv 2017-08
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/29490
Calvo, Rafael; Santana, Vinicius T.; Nascimento, Otaciro R.; Temperature dependence of the effective interdimer exchange interaction in a weakly coupled antiferromagnetic dimer copper compound; American Physical Society; Physical Review B; 96; 064424; 8-2017; 1-7
2469-9950
2469-9969
CONICET Digital
CONICET
url http://hdl.handle.net/11336/29490
identifier_str_mv Calvo, Rafael; Santana, Vinicius T.; Nascimento, Otaciro R.; Temperature dependence of the effective interdimer exchange interaction in a weakly coupled antiferromagnetic dimer copper compound; American Physical Society; Physical Review B; 96; 064424; 8-2017; 1-7
2469-9950
2469-9969
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://link.aps.org/doi/10.1103/PhysRevB.96.064424
info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevB.96.064424
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv American Physical Society
publisher.none.fl_str_mv American Physical Society
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.13397

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