Magnetic hyperfine field at 119Sn and 111Cd probes in Gd5Ge4 studied by Mössbauer and PAC spectroscopy

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dc.contributor.authorKRYLOV, V.I.pt_BR
dc.contributor.authorBOSCH-SANTOS, B.pt_BR
dc.contributor.authorCABRERA-PASCA, G.A.pt_BR
dc.contributor.authorCARBONARI, A.W.pt_BR
dc.contributor.authorSAXENA, R.N.pt_BR
dc.contributor.authorLEITE NETO, O.F.S.pt_BR
dc.coverageInternacionalpt_BR
dc.creator.eventoINTERNATIONAL CONFERENCE ON HYPERFINE INTERACTIONS AND THEIR APPLICATIONSpt_BR
dc.date.accessioned2020-06-17T18:20:20Z
dc.date.available2020-06-17T18:20:20Z
dc.date.eventoFebruary 10-15, 2019pt_BR
dc.description.abstractThe magnetic structure of Gd5Ge4 belonging to the family of giant magnetocaloric Gd5(Si1-xGex)4 alloys [1] has been examined by magnetization measurements in single crystal [2, 3], X-ray resonant magnetic scattering (XRMS) [4], and neutron powder diffraction (NPD [5]. Gd5Ge4 crystallizes in the orthorhombic structure (space group Pnma) having three non-equivalent Ge-sites. At low temperatures, the Gd magnetic moments are ferromagnetically (FM) aligned within the slabs along the c-direction, while their stacking in the b-direction is antiferromagnetic (AFM) below 127 K [2, 4]. In this work, the temperature dependence of the magnetic hyperfine field (HF) and electric quadrupole interaction on 119Sn and 111Cd probe nuclei in Gd5Ge4 compound have been investigated by Mössbauer and perturbed angular correlation (PAC) spectroscopy. At the saturation, the HF magnitudes reach of Bhf =28.0(5) T and Bhf= 12.6(5) T for 119Sn and 111Cd, respectively, which correspond to the FM local magnetic environment for these probes. It was found that 119Sn probes are placed in two Ge positions, whereas 111Cd probes are located in only one of the three Ge positions in Gd5Ge4. Temperature dependence of Bhf for both 119Sn and 111Cd probes in Gd5Ge4 present anomalous behavior. In the range from 20 K to 120K, the HF decreases almost linearly when temperature increases. These anomalous behavior of Bhf(T) for 119Sn and 111Cd probes are in agreement with the temperature variation of the magnetic (070) and (010) peak intensities that have been found in XRMS [3] and NPD [4] studies. The AFM ordering temperature of Gd5Ge4, TN=129(1) K, found from the Bhf (T) is in agreement with previous results of [2 - 5]. Changes of the values and sign of the quadrupole shift of Mössbauer spectra for 119Sn atoms with the increase of temperature from 30 to 50 K confirm the spin-flop transition in Gd5Ge4 [2, 4].pt_BR
dc.event.siglaHYPERFINEpt_BR
dc.format.extent39-39pt_BR
dc.identifier.citationKRYLOV, V.I.; BOSCH-SANTOS, B.; CABRERA-PASCA, G.A.; CARBONARI, A.W.; SAXENA, R.N.; LEITE NETO, O.F.S. Magnetic hyperfine field at 119Sn and 111Cd probes in Gd5Ge4 studied by Mössbauer and PAC spectroscopy. In: INTERNATIONAL CONFERENCE ON HYPERFINE INTERACTIONS AND THEIR APPLICATIONS, February 10-15, 2019, Goa, India. <b>Abstract...</b> Mumbai, India: Tata Institute of Fundamental Research, 2019. p. 39-39. Disponível em: http://repositorio.ipen.br/handle/123456789/31309.
dc.identifier.orcid0000-0003-3023-1718pt_BR
dc.identifier.orcid0000-0002-4499-5949pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-4499-5949
dc.identifier.urihttp://repositorio.ipen.br/handle/123456789/31309
dc.localMumbai, Indiapt_BR
dc.local.eventoGoa, Indiapt_BR
dc.publisherTata Institute of Fundamental Researchpt_BR
dc.rightsopenAccesspt_BR
dc.titleMagnetic hyperfine field at 119Sn and 111Cd probes in Gd5Ge4 studied by Mössbauer and PAC spectroscopypt_BR
dc.typeResumo de eventos científicospt_BR
dspace.entity.typePublication
ipen.autorV.I. KRYLOV
ipen.autorRAJENDRA NARAIN SAXENA
ipen.autorOSMAR FLAVIO DA SILVEIRA LEITE NETO
ipen.autorARTUR WILSON CARBONARI
ipen.autorGABRIEL ADOLFO CABRERA PASCA
ipen.autorBRIANNA BOSCH DOS SANTOS
ipen.codigoautor15370
ipen.codigoautor1329
ipen.codigoautor12755
ipen.codigoautor1437
ipen.codigoautor3558
ipen.codigoautor7480
ipen.contributor.ipenauthorV.I. KRYLOV
ipen.contributor.ipenauthorRAJENDRA NARAIN SAXENA
ipen.contributor.ipenauthorOSMAR FLAVIO DA SILVEIRA LEITE NETO
ipen.contributor.ipenauthorARTUR WILSON CARBONARI
ipen.contributor.ipenauthorGABRIEL ADOLFO CABRERA PASCA
ipen.contributor.ipenauthorBRIANNA BOSCH DOS SANTOS
ipen.date.recebimento20-06
ipen.event.datapadronizada2019pt_BR
ipen.identifier.ipendoc27087pt_BR
ipen.notas.internasAbstractpt_BR
ipen.type.genreResumo
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relation.isAuthorOfPublication.latestForDiscoverydb77deb2-decd-46fa-9504-38fd0156fc26
sigepi.autor.atividadeLEITE NETO, O.F.S.:12755:310:Npt_BR
sigepi.autor.atividadeSAXENA, R.N.:1329:310:Npt_BR
sigepi.autor.atividadeCARBONARI, A.W.:1437:310:Npt_BR
sigepi.autor.atividadeCABRERA-PASCA, G.A.:3558:310:Npt_BR
sigepi.autor.atividadeBOSCH-SANTOS, B.:7480:310:Npt_BR
sigepi.autor.atividadeKRYLOV, V.I.:15370:-1:S
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