Abstract
Formation of high-temperature superconducting phases of some hydrides requires high pressure (several hundred gigapascals), which causes lattice compression and, correspondingly, exponential increase in the probability of hydrogen-atom tunneling between equivalent interstitial sites. At low temperatures, vacancies in the hydrogen sublattice (occupied under stoichiometric conditions) and hydrogen atoms in the interstitial sublattice (absolutely vacant under stoichiometric conditions) are quantum defects (defectons). The defecton contribution to the superconductivity of hydrides has been estimated. It is shown that this contribution can be large both for free defectons and defectons clusterized with formation of two-level systems.
Similar content being viewed by others
REFERENCES
A. P. Drozdov, M. I. Eremets, I. A. Troyan, V. Ksenofontov, and S. I. Shylin, Nature (London, U.K.) 525, 73 (2015).
D. Duan, Y. Liu, Y. Ma, Z. Shao, B. Liu, and T. Cui, Nat. Sci. Rev. 4, 121 (2017).
W. Sano, T. Koretsune, T. Tadano, R. Akashi, and R. Arita, Phys. Rev. B 93, 094525 (2016).
Q. Zhuang, X. Jin, T. Cui, D. Zhang, Y. Li, X. Li, K. Bao, and B. Liu, Phys. Rev. B 98, 024514 (2018).
L. P. Gor’kov and V. Z. Kresin, Rev. Mod. Phys. 90, 011001 (2018).
K. S. Grishakov, N. N. Degtyarenko, and E. A. Mazur, J. Exp. Theor. Phys. 128, 105 (2019).
A. F. Andreev and I. M. Lifshits, Sov. Phys. JETP 29, 1107 (1969).
A. I. Morozov, Sov. Phys. JETP 50, 738 (1979).
Y. Li, J. Hao, H. Liu, J. S. Tse, Y. Wang, and Y. Ma, Sci. Rep. 5, 09948 (2015).
X. Feng, J. Zhang, G. Gao, H. Liu, and H. Wang, RSC Adv. 5, 59292 (2015).
K. Tanaka, J. S. Tse, and H. Liu, Phys. Rev. B 96, 100502(R) (2017).
A. I. Morosov and A. S. Sigov, Solid State Commun. 53, 31 (1985).
J. Kondo, Phys. B 123, 175 (1984).
B. Roulet, J. Gavoret, and P. Nozieres, Phys. Rev. 178, 1072 (1969).
P. Nozieres, J. Gavoret, and B. Roulet, Phys. Rev. 178, 1084 (1969).
P. Nozieres and C. T. de Dominicis, Phys. Rev. 178, 1097 (1969).
A. I. Morozov and A. S. Sigov, Phys. Usp. 37, 229 (1994).
A. I. Morozov and A. S. Sigov, Sov. Phys. JETP 68, 97 (1989).
J. Völkl and G. Alefeld, Hydrogen in Metals (Springer, Berlin, 1978; Mir, Moscow, 1981).
V. A. Somenkov and S. Sh. Shil’shtein, Phase Transformations of Hydrogen in Metals (IAE, Moscow, 1979) [in Russian].
W. A. Harrison, Solid State Theory (McGraw-Hill, New York, 1970; Mir, Moscow, 1970).
A. I. Morosov and A. S. Sigov, Solid State Commun. 67, 841 (1988).
D. Neumaier, H. Steinbinder, H. Wipf, G. Blank, and Z. Kearley, Phys. B 76, 359 (1989).
A. I. Morozov and A. S. Sigov, Sov. Phys. JETP 71, 813 (1990).
A. P. Zhernov, Fiz. Met. Metalloved. 67, 655 (1989).
V. P. Mineev, JETP Lett. 51, 453 (1990).
A. I. Morozov and A. S. Sigov, Sov. Phys. JETP 74, 491 (1992).
G. M. Eliashberg, Sov. Phys. JETP 11, 696 (1960);
Sov. Phys. JETP 12, 1000 (1960).
Author information
Authors and Affiliations
Corresponding author
Additional information
Translated by A. Sin’kov
Rights and permissions
About this article
Cite this article
Morosov, A.I. Defecton Contribution to the High-Temperature Superconductivity of Hydrides. Phys. Solid State 61, 1176–1179 (2019). https://doi.org/10.1134/S1063783419070199
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S1063783419070199