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dc.contributor.authorMotta, Arthur T.pt_BR
dc.contributor.authorCatchen, Gary L.pt_BR
dc.contributor.authorCumblidge, Stephen E.pt_BR
dc.contributor.authorRasera, R.L.pt_BR
dc.contributor.authorPaesano Junior, Andreapt_BR
dc.contributor.authorAmaral, Liviopt_BR
dc.date.accessioned2014-10-07T02:11:28Zpt_BR
dc.date.issued1999pt_BR
dc.identifier.issn1098-0121pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/104230pt_BR
dc.description.abstractWe have measured the temperature dependence of the electric and magnetic hyperfine interactions at 181Ta nuclei substituted into the Zr site in the Laves-phase compound ZrFe2, using the perturbed angular correlation of g rays emitted after the b2 decays of 181Hf probe nuclei. Although the overall crystal structure is cubic, a weak strongly damped electric-quadrupole interaction is observed, which shows no significant temperature dependence over the investigated temperature range from 290–1300 K. Thus below the magnetic ordering temperature TC of 631~2! K we observe combined magnetic-dipole and electric-quadrupole hyperfine interactions. Two separate magnetic components characterize the magnetic-dipole interactions. For the interaction at the primary site, which is occupied by 70–80% of the probes, the Larmor frequency measured at temperature has a value of vL5407(1) Mrad sec21. The secondary site is populated by the remaining 20–30% of the probes, for which the corresponding Larmor frequency has a room temperature value of vL 5579(3) Mrad sec21. We attribute the primary interaction to the ‘‘perfect-crystal’’ probe environment at the Zr site, whereas we ascribe the secondary interaction to the enhancement of the transferred hyperfine field by the presence of Fe antisite defects near the Zr site. At temperatures below but very close to TC , those frequencies cannot be determined for either interaction, because the magnetic-hyperfine and the electricquadrupole frequencies converge to comparable values.en
dc.format.mimetypeapplication/pdf
dc.language.isoengpt_BR
dc.relation.ispartofPhysical review. B, Condensed matter and materials physics. Woodbury. Vol. 60, no. 2 (July 1999), p. 1188-1196pt_BR
dc.rightsOpen Accessen
dc.subjectInteracoes hiperfinaspt_BR
dc.subjectCampos magnéticospt_BR
dc.subjectCampos elétricospt_BR
dc.subjectCompostos de ferropt_BR
dc.subjectCorrelacao angular perturbadapt_BR
dc.subjectTemperaturapt_BR
dc.subjectEspectroscopiapt_BR
dc.subjectTransformadas de fourierpt_BR
dc.subjectEfeito mossbauerpt_BR
dc.subjectDefeitospt_BR
dc.subjectCompostos de zirconiopt_BR
dc.titleDefects and magnetic hyperfine fields in ZrFe/sub 2/ investigated using perturbed-angular-correlation spectroscopypt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000248182pt_BR
dc.type.originEstrangeiropt_BR


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