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TT: Tiefe Temperaturen

TT 13: HTSL: Ramanstreuung, elektronische Struktur

TT 13.4: Talk

Wednesday, March 19, 1997, 15:30–15:45, F2

Aspects of the electronic structure of PrBa₂Cu₃O₇ — •Roland Fehrenbacher¹ and T. M. Rice² — ¹Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, D-70569 Stuttgart, Germany — ²ETH Hönggerberg, CH-8093 Zürich, Switzerland

The PrBa₂Cu₃O₇ compound continues to be of substantial interest to the high-T_c community not only because of the unique role of Pr to suppress superconductivity, but also as a result of its unusual magnetic and transport properties. Here, we shall discuss various aspects of the electronic structure of PrBa₂Cu₃O₇: (a) The difference in the hole occupation of the planar O orbitals as compared to YBa₂Cu₃O₇, (b) the importance of electronic correlations to understand the measured ac conductivity, and (c) the influence of the ion radius of the rare earth element (Re) in Re_1−xPr_xBa₂Cu₃O₇ on the rate of T_c suppression as a function of x.