Field-induced metamagnetic transitions and two-dimensional excitations in ludwigite Co4.76Al1.24(O2BO3)2

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dc.creatorCynthia Paola Contreras Medrano
dc.creatorDaniele Cristina Silva de Freitas
dc.creatorEdson Passamani Caetano
dc.creatorCarlos Basílio Pinheiro
dc.creatorElisa Maria Baggio Saitovitch
dc.creatorMucio Amado Continentino
dc.creatorDalber Ruben Sanchez Candela
dc.date.accessioned2023-07-24T14:58:10Z
dc.date.accessioned2025-09-08T23:44:11Z
dc.date.available2023-07-24T14:58:10Z
dc.date.issued2017
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
dc.description.sponsorshipFAPERJ - Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.95.214419
dc.identifier.issn2469-9969
dc.identifier.urihttps://hdl.handle.net/1843/56880
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofPhysical Review B
dc.rightsAcesso Restrito
dc.subjectAntiferromagnetismo
dc.subjectTransições de fases
dc.subject.otherHeterometallic ludwigite
dc.subject.otherPhase transitions
dc.subject.otherAntiferromagnetism
dc.titleField-induced metamagnetic transitions and two-dimensional excitations in ludwigite Co4.76Al1.24(O2BO3)2
dc.typeArtigo de periódico
local.citation.epage214419-6
local.citation.issue21
local.citation.spage214419-1
local.citation.volume95
local.description.resumoThis paper presents an extensive study of the structural, magnetic, and thermodynamic properties of the heterometallic ludwigite Co4.76 Al 1.24 (O2 BO3 ) 2 . This material orders ferrimagnetically at 57 K. Despite the fact that, in Co4.76 Al 1.24 (O2 BO3 ) 2 , one quarter of the Co ions of the parent compound Co3 O2 BO3 is replaced by nonmagnetic Al 3+ ions, the TC of the former (57 K) is larger than that of the latter (42 K). We obtain the phase diagram of Co4.76 Al 1.24 (O2 BO3 ) 2 in an external magnetic field. We find a line of second-order phase transitions where the system presents a metamagnetic transition (from 57 to 25 K). This line ends at a tricritical point at 25 K and 4.3 T, below which the transition to the paramagnetic phase is first order (from 25 to 3 K). In the magnetic phase at low temperatures specific heat measurements in zero and finite magnetic fields show that the low-energy excitations are magnetic (magnons) and elastic (phonons) excitations with two-dimensional character. These measurements also reveal the magnetocaloric properties of this material.
local.identifier.orcidhttps://orcid.org/0000-0002-2565-0304
local.identifier.orcidhttps://orcid.org/0000-0002-1310-2749
local.identifier.orcidhttps://orcid.org/0000-0002-8674-1779
local.identifier.orcidhttps://orcid.org/0000-0003-4082-8585
local.identifier.orcidhttp://orcid.org/0000-0003-0167-8529
local.identifier.orcidhttps://orcid.org/0000-0003-4253-9031
local.publisher.countryBrasil
local.publisher.departmentICX - DEPARTAMENTO DE FÍSICA
local.publisher.initialsUFMG
local.url.externahttps://journals.aps.org/prb/abstract/10.1103/PhysRevB.95.214419

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