Local probing of Hg neighboorhood in HgBa$_{2}$CuO$_{4+\delta}$

Electric field gradients (EFG) on mercury sites of the Hg1201 high-TC superconductors were measured with the perturbed angular correlation (PAC) technique. In Hg1201 samples where PAC detects higher oxygen content the EFGs have decreased to lower values indicating an elongation of the Hg-apical oxyg...

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Detalles Bibliográficos
Autores principales: Correia, J G, Araújo, J P, Loureiro, S M, Toulemonde, P, Le Floc'h, S, Bordet, P, Capponi, J J, Gatt, R, Tröger, W, Ctortecka, B, Butz, T, Haas, H, Marques, J G, Soares, J C
Lenguaje:eng
Publicado: 2000
Materias:
Condensed Matter
Acceso en línea:http://cds.cern.ch/record/487199
Descripción
Sumario:Electric field gradients (EFG) on mercury sites of the Hg1201 high-TC superconductors were measured with the perturbed angular correlation (PAC) technique. In Hg1201 samples where PAC detects higher oxygen content the EFGs have decreased to lower values indicating an elongation of the Hg-apical oxygen dumb-bell. On the same samples the asymmetry parameter of the EFG becomes non-zero below 100 K, showing that the charge distribution near the Hg-apical oxygen chain becomes non-axially symmetric at low temperature.

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