The influence of external pressure on the intrinsic term in Hg, Re-1223 superconductor
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2008
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ENCONTRO NACIONAL DE FISICA DA MATERIA CONDENSADA, 31.
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XANES study of Hg,Re-1223 ceramic superconductor was developed using a DAC cell pressure in the DXAS
beam line - LNLS. The investigation was focused in the LIII edge from the ReO6 octahedron. The influence of
the external pressure on XANES region is associated with the intrinsic term, which appear on the equation that
have been used to described the behavior of the Tc as a function of the external pressure. We have identified
changes in the overlap between two Gaussians that it is used to fit the XANES region. These Gaussians
are related with the t2g and eg energy split from the distorted ReO6 octahedron present in the Hg,Re-1223
superconductor. High pressure conditions associated with the X-Ray techniques can be used to study structural
properties of materials are examples of properties that can be affected under high pressure conditions, which
characterize it as a powerful tool in the material science[1-5]. The main characteristics of the LNLS’s dispersive
X-ray absorption (DXAS) beam-line are both the temporal resolution (typically one absorption spectrum can
be measured in hundreds of milliseconds) and very small focus [1], which allows materials properties studies
under high pressure conditions. The instrumentation available at the DXAS beam-line count with a diamond
anvil cell (DAC) specially designed to in situ high pressure experiments. Details of the DAC are shown. This
work presents an overview about the firsts attempts of high pressure experiments at the DXAS beam-line using
this pressure cells focused on a distortion of the crystalline structure of ReO3 present in Hg,Re-1223 under high
pressure.
Como referenciar
CARVALHO, E.J.; AZEVEDO, G.; GARCIA, F.; ROSSI, J.L.; MARTINEZ, L.G.; ORLANDO, M.T.D.; PASSAMAI, J.L.; CORREA, H.P.S.; PASSOS, C.A.C.; SOUZA, D.O. de; KUPLICH, L.; DEPIANTI, J.B. The influence of external pressure on the intrinsic term in Hg, Re-1223 superconductor. In: ENCONTRO NACIONAL DE FISICA DA MATERIA CONDENSADA, 31., 5-9 de maio, 2008, Aguas de Lindoia, SP. Resumo... Disponível em: http://repositorio.ipen.br/handle/123456789/22842. Acesso em: 31 Dec 2025.
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