Regensburg 2000 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 17: Postersitzung II: Pinning und Vortexdynamik (1-8), Supraleitung: Theorie (9-13), Korrelierte Elektronen (14-48), Niederdimensionale Systeme (49-68), Quantenflüssigkeiten (69-75)
TT 17.74: Poster
Mittwoch, 29. März 2000, 14:30–18:00, A
Spin Echo experiments in solid 3He — •E. Nazaretski, K. Taubenreuther, L. Hristakos, H. Götz und G. Eska — Physikalisches Institut, Universität Bayreuth, D-95440 Bayreuth
Spin Echo experiments were performed on paramagnetic solid 3He at melting pressure. A variation of the magnetic field from 30mT to 200mT and temperatures from 8 to 60 mK gave spin polarization values up to 1.5%. Therefore the demagnetizing fields whic
h are mainly responsible for the formation of Multiple Spin Echo structures (MSE) were changing between 7 and 50mG. The MSE amplitudes were monitored after the application of π/2−τ−π/2 NMR pulse sequence. Spindynamics (T1, T2
, D0) was analysed in the frameworks of Hazegawa1 approach of MSE formation. Preliminary results indicate a deviation from theoretically expected behaviour at least at higher spin polarizations.
1 Y.Hazegawa, Prog.Theor.Phys. 67,1232 (1982)