Regensburg 2010 – wissenschaftliches Programm

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SYMR: Symposium Nuclear Magnetic Resonance: from Applications in Condensed-Matter Physics to New Frontiers

SYMR 2: Poster: Nuclear Magnetic Resonance - Frontiers and Applications

SYMR 2.3: Poster

Montag, 22. März 2010, 16:30–18:00, Poster C

Spatial inhomogeneities in optimally doped and underdoped high-temperature superconducting single crystals of HgBa₂CuO_4+d, a ⁶³Cu and ¹⁹⁹Hg NMR study — •Damian Rybicki^1,2, Juergen Haase¹, Marc Lux¹, Martin Greven^3,4, Guichuan Yu⁵, and Yuan Li⁵ — ¹Faculty of Physics and Earth Sciences, Leipzig University, Linnéstraße 5, 04103 Leipzig, Germany — ²Department of Solid State Physics, Faculty of Physics and Applied Computer Sciences, AGH-University of Science and Technology, Al. Mickiewicza 30, 30-059 Krakow, Poland — ³School of Physics and Astronomy, University of Minnesota, 116 Church Street S. E. Minneapolis, MN, 55455, USA — ⁴Stanford Synchrotron Radiation Laboratory, Stanford, CA 94309, USA — ⁵Department of Physics, Stanford University, Stanford, CA 94305, USA

Nuclear magnetic resonance is a very important tool to study high-temperature superconducting cuprates (HTSCs). We present results of ⁶³Cu and ¹⁹⁹Hg NMR of HgBa₂CuO_4+d single crystals with critical temperatures, T_c=97 K and T_c=74 K (optimally doped and underdoped, respectively). HgBa₂CuO_4+d due to its very simple structure and only one Cu lattice site is a model compound for understanding the properties of HTSCs. Measurements of the central and satellite transition lines have been carried out as a function of temperature (20-300 K) and orientation of the external magnetic field, B₀ with respect to crystal axes. From the temperature dependence of the spin shifts, line widths and quadrupole splitting we find a very large spatial variation of the hole density even in these high quality single crystals.