Nanotube-based source of charges for experiments with solid helium at low temperatures

10th International Conference on Cryocrystals and Quantum Crystals (Final part)

Автор(и)

  • D.N. Borisenko Institute of Solid State Physics RAS, Chernogolovka, Moscow Region 142432, Russia
  • P.M. Walmsley The University of Manchester, Oxford Road, Manchester M13 9PL, UK
  • A.I. Golov The University of Manchester, Oxford Road, Manchester M13 9PL, UK
  • N.N. Kolesnikov Institute of Solid State Physics RAS, Chernogolovka, Moscow Region 142432, Russia
  • Yu.V. Kotov Institute of Solid State Physics RAS, Chernogolovka, Moscow Region 142432, Russia
  • A.A. Levchenko Institute of Solid State Physics RAS, Chernogolovka, Moscow Region 142432, Russia
  • L.P. Mezhov-Deglin Institute of Solid State Physics RAS, Chernogolovka, Moscow Region 142432, Russia
  • M.J. Fear The University of Manchester, Oxford Road, Manchester M13 9PL, UK

DOI:

https://doi.org/10.1063/1.4927049%20

Ключові слова:

carbon nanotubes, solid helium, voltage-current characteristic.

Анотація

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 super-fluid 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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Опубліковано

2015-05-18

Як цитувати

(1)
Borisenko, D.; Walmsley, P.; Golov, A.; Kolesnikov, N.; Kotov, Y.; Levchenko, A.; Mezhov-Deglin, L.; Fear, M. Nanotube-Based Source of Charges for Experiments With Solid Helium at Low Temperatures: 10th International Conference on Cryocrystals and Quantum Crystals (Final Part). Fiz. Nizk. Temp. 2015, 41, 729-732.

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