Local Oδ probing in the high-Tc superconductor HgBa2CuO4+δ

ISOLDE Collaboration; J. G. Correia; J. P. Araújo; S. M. Loureiro; P. Toulemonde; S. Le Floch; P. Bordet; J. J. Capponi; R. Gatt; W. Tröger; B. Ctortecka; T. Butz; H. Haas; J. G. Marques; J. C. Soares

doi:10.1103/PhysRevB.61.11769

Local Oδ probing in the high-Tc superconductor HgBa2CuO4+δ

ISOLDE Collaboration, J. G. Correia, J. P. Araújo, S. M. Loureiro, P. Toulemonde, S. Le Floch, P. Bordet, J. J. Capponi, R. Gatt, W. Tröger, B. Ctortecka, T. Butz, H. Haas, J. G. Marques, J. C. Soares

DOI 10.1103/PhysRevB.61.11769 · Physical Review B

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Abstract

Electric-field gradients on mercury sites of the HgBa2CuO4+δ high-Tc superconductor were measured with the perturbed angular correlation technique and interpreted with ab initio calculations. Under oxygen annealing, an asymmetric electric-field gradient has been assigned to the presence of single oxygen atoms, Oδ, which are located in the Hg planes. These experiments provide an atomic scale tool for studying charge-density variations occuring in the neighborhood of the Hg atoms, which can be induced, particularly, by pointlike defects.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	88	Pressure not reported	unknown
HgBa2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	164	30 GPa	unknown