Abstract
In nanographite films, for the first time, when measuring the current–voltage characteristics, the Josephson current at room temperature has been detected, which confirms the earlier observations in nanographite films of the effects of weak superconductivity: zeroing of the temperature dependence at 650 K of the constant voltage on the sample when exposed to an alternating microwave voltage due to the inverse Josephson effect, as well as observation in a magnetic force microscope of local regions with the structure of magnetic vortices at room temperature. The obtained value of the critical current of 0.8 μA is significantly lower than the expected value for the superconducting gap, as well as for pinning at the Bean–Levingston barrier. Measures for increasing the critical current are proposed.
Similar content being viewed by others
REFERENCES
A. P. Drozdov, M. I. Eremets, I. A. Troyan, V. Ksenofontov, and S. I. Shilin, Nature 525, 73 (2015).
M. Somayazulu, M. Ahart, A. K. Mishra, Z. M. Geballe, M. Baldini, Y. Meng, et al., Phys. Rev. Lett. 122 (2), 027001 (2019).
E. Snider, N. Dasenbrock-Gammon, R. McBride, M. Debessai, H. Vindana, et al., Nature 586 (7829), 373 (2020).
V. Z. Kresin and Yu. N. Ovchinnikov, Phys.-Usp. 51 (5), 427 (2008). https://doi.org/10.1070/PU2008v051n05ABEH006531
V. Z. Kresin and Yu. N. Ovchinnikov, Phys. Rev. B 74 (2), 024514 (2006).
K. N. Yugai, Vestn. Omsk. Univ., No. 2 (68), 104 (2013); No. 4, 88 (2010).
S. G. Lebedev and S. V. Topalov, Bull. Lebedev Phys. Inst., No. 12, 14 (1994).
S. G. Lebedev, J. Phys. Chem. Solids 75 (9), 1029 (2014).
S. G. Lebedev, Nucl. Instrum. Methods Phys. Res., Sect. A 521, 22 (2004).
S. G. Lebedev, Int. Rev. Phys. 2, 312 (2008).
Unconventional Electromagnetics in Carbonaceous Materials, Ed. by S. G. Lebedev (Nova Sci., 2010). ISBN 9781616681746.
S. G. Lebedev, J. Mater. Sci.: Mater. Electron. 31 (23), 20883 (2020).
J. T. Chen, L. E. Wenger, C. J. McEwan, and E. M. Logothetis, Phys. Rev. Lett. 58 (19), 1972 (1987).
R. Munger and H. J. T. Smith, Phys. Rev. B 44 (1), 242 (1991).
B. T. Kelly, Physics of Graphite (Appl. Sci., London, 1981).
C. P. Bean, Phys. Rev. Lett. 8 (6), 250 (1962).
C. P. Bean, Rev. Mod. Phys. 36 (1), 31 (1964).
L. Burlachkov, V. B. Geshkenbein, A. E. Koshelev, A. I. Larkin, and V. M. Vinokur, Phys. Rev. B 50 (22), 16770 (1994).
C.-R. Hu, Phys. Rev. B 6, 1756 (1972).
S. M. Maurer, N. C. Yeh, and T. A. Tombrello, Phys. Rev. B 54, 15372 (1996).
Author information
Authors and Affiliations
Corresponding author
Ethics declarations
The author declares that he has no conflicts of interest.
Additional information
Translated by N. Wadhwa
Rights and permissions
About this article
Cite this article
Lebedev, S.G. Josephson Effect in Nanographite Films. Tech. Phys. 67, 696–699 (2022). https://doi.org/10.1134/S1063784222100036
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S1063784222100036