Nanotube-based source of charges for experiments with solid helium at low temperatures
Methods of preparation of the field-emission sources of charges from carbon nanotubes suitable for study of injected charges in solid helium at low temperatures T < 1 K are presented. The sources have been prepared by arc discharge deposition of nanotubes onto a flat copper substrate or by mech...
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| Date: | 2015 |
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| Main Authors: | , , , , , , , |
| Format: | Article |
| Language: | English |
| Published: |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2015
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| Series: | Физика низких температур |
| Subjects: | |
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| Journal Title: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Cite this: | Nanotube-based source of charges for experiments with solid helium at low temperatures / D.N. Borisenko1, P.M. Walmsley, A.I. Golov, N.N. Kolesnikov, Yu.V. Kotov, A.A. Levchenko, L.P. Mezhov-Deglin, M.J. Fear // Физика низких температур. — 2015. — Т. 41, № 7. — С. 729–732. — Бібліогр.: 11 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| Summary: | Methods of preparation of the field-emission sources of charges from carbon nanotubes suitable for study of injected
charges in solid helium at low temperatures T < 1 K are presented. The sources have been prepared by arc
discharge deposition of nanotubes onto a flat copper substrate or by mechanical rubbing of nanotubes into porous
metal surface. The test study of the voltage-current characteristics of a diode cell with the nanotube source in superfluid
He II have shown that at voltages above 120 V one can observe a relatively large current I ≥ 10⁻¹³ A of negative
charges in liquid helium. The field and temperature dependences of positive and negative currents in solid ⁴He
were studied in samples grown by the blocked capillary technique. Usage of the nanotube based source of injected
charges had permitted us for the first time to observe motion of the positive charges in solid helium at temperatures
below 0.1 К. The current-voltage dependence could be described by a power law I ~ Uα, with the value of the exponent α >> 2, much higher than what one would expect for the regime of space charge limited currents. |
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