Regensburg 2000 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 22: Postersitzung III: Supraleitende Anwendungen (1-4) Massive HTSL, Bandleiter, Filme (5-26), Transport in HTSL (27-30), Elektronenstruktur in Supraleitern (31-43), Borkarbide (44-50), Quantenphasen- und Metall-Isolator-Überg
änge (51-69)

TT 22.62: Poster

Donnerstag, 30. März 2000, 14:00–17:30, A

Electronic spectral properties of quasi-1D SrNbO_3.41 — •C. A. Kuntscher¹, S. Gerhold¹, N. N"ucker¹, S. Schuppler¹, M. Grioni², F. Lichtenberg³, and J. Mannhart³ — ¹Forschungszentrum Karlsruhe, IFP, D–76021 Karlsruhe — ²IPA, Ecole Polytechique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland — ³Universität Augsburg, D–86159 Augsburg

The compound SrNbO_3.41 belongs to the perovskite-related series
Sr_n+1Nb_n+1O_3n+5 with corner-sharing NbO₆ octahedra as the main building blocks of the crystal structure. The octahedral network is broken up periodically along the c axis, forming slabs which are five NbO₆ octahedra wide. Along the a axis, the octahedra are connected continuously via the apical oxygen atoms in a chain-like fashion. Previous angle-resolved photoemission (ARPES) measurements on La_0.1Sr_0.9NbO_3.39 [1] revealed one-dimensional (1D) dispersive behavior along the chain direction and strongly suggests a 1D Fermi surface. Examination with very high-resolution ARPES, however, provides indications within the electronic spectral properties that Fermi-level crossing is not fully developed, thus questioning if a Fermi liquid framework is applicable for this compound.

[1] C. A. Kuntscher et al., to appear in PRB.