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TT: Fachverband Tiefe Temperaturen

TT 10: Poster Session: Superconductivity

TT 10.34: Poster

Montag, 14. März 2011, 14:00–18:00, P4

Two-component behaviour of high-temperature superconductor HgBa₂CuO_4+δ - a ¹⁹⁹Hg and ⁶³Cu NMR study — •Damian Rybicki¹, Jürgen Haase¹, Charles Slichter², Marc Lux¹, Martin Greven³, Guichuan Yu⁴, and Yuan Li⁴ — ¹Faculty of Physics and Earth Science, Leipzig University, Linnéstraße 5, 04103 Leipzig, Germany — ²Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801-3080,USA — ³School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA — ⁴Department of Physics, Stanford University Stanford, CA 94305, USA

One of the early, central questions of cuprate high-temperature superconductivity was whether a single-fluid description of the electronic spin susceptibility was appropriate in explaining nuclear magnetic resonance (NMR) experimental data. Recently, it has been shown that in the case of La_1.85Sr_0.1CuO₄ a single fluid picture is inappropriate and two components are necessary. Here, we present the results of ¹⁹⁹Hg and ⁶³Cu NMR study of two single crystals of hole doped high-temperature superconductor (HTS), HgBa₂CuO_4+δ an optimally doped and underdoped with T_c=97 K and T_c=74 K, respectively. Careful analysis of the temperature dependence of ¹⁹⁹Hg and ⁶³Cu shifts measured for two orientations of the crystal with respect to the external field shows that also in this system, which can be viewed as a model HTS, a single component scenario does not agree with experimental data.