Phillips, A. and McClintock, Peter V. E. (1974) Breaking the roton barrier: An experimental study of motion faster than the Landau critical velocity for roton creation in He II. Physical Review Letters, 33 (25). pp. 1468-1471. ISSN 1079-7114Full text not available from this repository.
We report the first observation of objects moving through He II with equilibrium drift velocities v beyond the Landau critical velocity vc,for roton creation. With T about 0.4 K, P = 25 bar, F =2 kV/cm, (v - vc) for negative ions is larger than a theoretical prediction by a factor of about 10^5. The vortex-ring nucleation rate is found to decrease with F above 300 V/cm, thus resolving apparent inconsistencies between earlier experiments.
|Journal or Publication Title:||Physical Review Letters|
|Subjects:||Q Science > QC Physics|
|Departments:||Faculty of Science and Technology > Physics|
|Deposited By:||Professor P. V. E. McClintock|
|Deposited On:||12 Apr 2010 14:56|
|Last Modified:||26 Jul 2012 17:12|
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