title: Cryogenic resonant acoustic spectroscopy of bulk materials (CRA spectroscopy).
abstract: The capability to measure Q factors at cryogenic temperatures enhances the ability to study relaxation processes in solids. Here we present a high-precision cryogenic setup with the ability to measure Q factors of at least 10(9). This level of sensitivity offers new potential for analyzing relaxation processes in solids and for correlating mode shape and relaxation strength. Our improved method of mechanical spectroscopy, cryogenic resonant acoustic spectroscopy of bulk materials, is verified by identifying relaxation processes in low-loss quartz crystals. For the first time, we observe additional damping peaks. The mechanical Q factors of different modes of cylindrical crystalline quartz substrates were measured from 300 down to 6 K. Resonant modes with frequencies between 10 and 325 kHz were excited without contact to the substrates and the ring down of the amplitudes was recorded using an interferometric vibration readout.
authors.affiliation: Institute of Solid State Physics, Friedrich-Schiller-University Jena, Helmholtzweg 5, D-07743 Jena, Germany.
authors.forename: Anja
authors.initials: A
authors.lastname: Zimmer
authors.forename: Ronny
authors.initials: R
authors.lastname: Nawrodt
authors.forename: Torsten
authors.initials: T
authors.lastname: Koettig
authors.forename: Ralf
authors.initials: R
authors.lastname: Neubert
authors.forename: Matthias
authors.initials: M
authors.lastname: Thürk
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Vodel
authors.forename: Paul
authors.initials: P
authors.lastname: Seidel
authors.forename: Andreas
authors.initials: A
authors.lastname: Tünnermann
mesh_terms: D000162:Acoustics / Q000295:instrumentation*; D003080:Cold Temperature; D017097:Electric Impedance; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008422:Materials Testing / Q000295:instrumentation* / Q000379:methods; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013057:Spectrum Analysis / Q000295:instrumentation* / Q000379:methods