Dresden 2011 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 2: SC: Properties, Electronic Structure, Mechanisms 1
TT 2.8: Talk
Monday, March 14, 2011, 12:30–12:45, HSZ 301
Effects of High Pressure on YBa2Cu4O8 probed by 17O NMR — •Thomas Meissner1, Swee K. Goh2,3, Jürgen Haase1, and Grant V. M. Williams4 — 1Faculty of Physics and Earth Science, University of Leipzig, Germany — 2Department of Physics, Cavendish Laboratory, University of Cambridge, United Kingdom — 3Trinity College, Cambridge, United Kingdom — 4The MacDiarmid Institute and Industrial Research Limited, New Zealand
The application of gigapascal pressure is a useful tool to tune the physical properties of high temperature superconductors but its effects have been scarcely studied by nuclear magnetic resonance (NMR) due a limited signal to noise ratio. Recently, some of us showed that this problem could be overcome with a new anvil cell probe design. Here we report on measurements of the 17O Knight shifts in the normal state of the stoichiometric compound YBa2Cu4O8 at pressures up to 6.3 GPa. Our data implies a significant pressure induced change of the spin susceptibility at the planar oxygen sites. The results are compared with doping effects observed in other cuprates.