A.F. Borghesani
- Published in print:
- 2007
- Published Online:
- January 2008
- ISBN:
- 9780199213603
- eISBN:
- 9780191707421
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199213603.003.0021
- Subject:
- Physics, Condensed Matter Physics / Materials
This chapter discusses the studies of the electron bubble mobility in normal liquid 3He. The high temperature measurements are extended into the milliKelvin range down to the superfluid transition at ...
More
This chapter discusses the studies of the electron bubble mobility in normal liquid 3He. The high temperature measurements are extended into the milliKelvin range down to the superfluid transition at approximately 2.7 mK. At such low temperatures, the mean free path of the quasiparticles of the liquid becomes larger than the size of the electron bubble, and the drag on them must be calculated in the Knudsen limit. A quantum modification of the Boltzmann transport equation has been used to describe theoretically the experimental results by taking into account the requirements of the Pauli exlusion principle for fermion scattering. It is shown that the ion recoil must be taken into account by means of the van Hove scattering functions.Less
This chapter discusses the studies of the electron bubble mobility in normal liquid 3He. The high temperature measurements are extended into the milliKelvin range down to the superfluid transition at approximately 2.7 mK. At such low temperatures, the mean free path of the quasiparticles of the liquid becomes larger than the size of the electron bubble, and the drag on them must be calculated in the Knudsen limit. A quantum modification of the Boltzmann transport equation has been used to describe theoretically the experimental results by taking into account the requirements of the Pauli exlusion principle for fermion scattering. It is shown that the ion recoil must be taken into account by means of the van Hove scattering functions.
A.F. Borghesani
- Published in print:
- 2007
- Published Online:
- January 2008
- ISBN:
- 9780199213603
- eISBN:
- 9780191707421
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199213603.003.0023
- Subject:
- Physics, Condensed Matter Physics / Materials
The realization that ions of different size are produced in liquid 3He with different concentrations of 4He isotopic impurities has allowed researchers to select the ion to be studied just by ...
More
The realization that ions of different size are produced in liquid 3He with different concentrations of 4He isotopic impurities has allowed researchers to select the ion to be studied just by changing the purity of the liquid. At about 70 mK, the positive ion mobility has a discontinuity related to the impossibility of further increase of an 4He-rich halo around the ion. Below the discontinuity, the temperature dependence of the mobility in the zero-field limit is well described by theory. At the discontinuity, it has been possible to determine the growth dynamics of the halo. The field dependence of the mobility also follows fairly accurately the theoretical description that takes into account ion recoil. The drift velocity non-linearities have put into evidence the equivalence of temperature and drift velocity in determining the ion mean energy.Less
The realization that ions of different size are produced in liquid 3He with different concentrations of 4He isotopic impurities has allowed researchers to select the ion to be studied just by changing the purity of the liquid. At about 70 mK, the positive ion mobility has a discontinuity related to the impossibility of further increase of an 4He-rich halo around the ion. Below the discontinuity, the temperature dependence of the mobility in the zero-field limit is well described by theory. At the discontinuity, it has been possible to determine the growth dynamics of the halo. The field dependence of the mobility also follows fairly accurately the theoretical description that takes into account ion recoil. The drift velocity non-linearities have put into evidence the equivalence of temperature and drift velocity in determining the ion mean energy.
