Berlin 2008 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 7: Matter at Low Temperature: Poster Session

TT 7.4: Poster

Monday, February 25, 2008, 14:00–18:00, Poster B

Mechanical loss mechanisms in crystalline quartz — •Daniel Heinert¹, Anja Schroeter¹, Christian Schwarz¹, Ronny Nawrodt¹, Ralf Neubert¹, Matthias Thürk¹, Wolfgang Vodel¹, Andreas Tünnermann², and Paul Seidel¹ — ¹Institut für Festkörperphysik, Helmholtzweg 5, D-07743 Jena, Germany — ²Institut für Angewandte Physik, Albert-Einstein-Straße 15, D-07745 Jena, Germany

Crystalline quartz is an excellent material to study internal dissipation mechanisms. Low loss materials are in great demand for future gravitational wave detectors reducing their thermal noise level within the detection band. Therefore, a deeper understanding of the loss mechanisms is necessary which depend on different parameters like the crystal orientation or the concentration of impurities. We present a detailed investigation of crystalline quartz samples ( 45 mm × 50 mm) at temperatures between 5 and 300 K. Two different crystal orientations (x-cut and z-cut) are compared. The influence of the impurities on the mechanical losses is discussed.

This work is supported by the German science foundation under contract SFB Transregio 7.