Münster 1997 – scientific programme

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TT: Tiefe Temperaturen

TT 6: Postersitzung I: Mesoskopie(1-21), amorphe Metalle und Defektsysteme(22-29), Kryotechnik, Kernmagnetismus(30-37), festes N₂(38), Quantenflüssigkeiten und -kristalle(39-48), dünne supraleitende Filme(49-68), schwere Fermionen und Kondosysteme(69-92), Fullerene(93-94)

TT 6.37: Poster

Tuesday, March 18, 1997, 09:30–13:00, Z1

Nuclear Acoustic Resonance (NAR) Experiments on AuIn₂ — •J. Leib¹, M. Huebner¹, G. Ihas², and G. Eska¹ — ¹Physikalisches Institut, Universit"at Bayreuth, D–95440 Bayreuth — ²University of Florida, Department of Physics, Gainesville, Fl32611-8440 USA

In NMR experiments on metallic bulk samples the NMR active volume is reduced because of the skin effect. This not only reduces the signal intensity but also leads to an inhomogeneous spin tipping over the volume of the sample. The penetration depth in superconducting materials is even smaller. Nuclear acoustic resonance (NAR) offers the possibility to overcome penetration dependent difficulties with high frequency electromagnetic fields. We applied NAR to the intermetallic compound AuIn₂, which shows several fascinating and unexpected effects at low temperature. In our experiments 10 MHz sound pulses of 10 µs duration were applied to the sample via a transducer. These pulses interact with the nuclear spin system over the modulated dynamic field gradients and/or over the internal rf–fields which are generated in the presence of a static external magnetic field. We measured the influence of in– and off– resonant sound fields on the pickup signal induced in an NMR coil wound directly on the single crystalline sample. We report on the results of these experiments as well as on CW–NAR–Experiments and on acoustic saturation of NMR.