national high magnetic field laboratory
PULSED FIELD FACILITY
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CRYSTAL RINGS AND RESONANCE FREQUENCIES
PIVOT MOUNT AND UNDERDOPED CRYSTALS
Resonant ultrasound spectroscopy measures the mechanical resonances of a crystal weakly coupled to drive and receive transducers. These mechanical resonant modes are determined by the sample shape, density, crystal symmetry, and elastic moduli.
Resonant ultrasound spectroscopy (RUS) measures the
frequencies, f, and widths, Γ, of the vibrational normal
modes of a crystal acting as a free mechanical resonator.
The frequencies of the normal modes are determined by the
density and geometry of the crystal as well as by its elastic
properties. The elastic component of the temperature
evolution of these frequencies, Δf(T), depends on a linear
combination of all elastic moduli and reflects changes in the
thermodynamic state of the system such as those
associated with a phase transition.
specialization and methods
crystal rings and resonance frequencies
Crystal rings at a set of frequencies. Resonance frequencies follow the changes in Elastic moduli.
pivot mount and underdoped crystal
Resonant ultrasound spectroscopy measurements on ultrahigh quality novel condensed matter systems require exceptional vibrational isolation in a broad temperature range. This is achieved using a) balsa wood or b) ceramic materials.