Parts | Days | Selection | Search | Updates | Downloads | Help

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. Goh^2,3, 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.