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Discovery of low‐temperature metastable state in amorphous bismuth—hydrogen systems
Author(s) -
Belevtsev B. I.,
Komnik Yu. F.,
Odnokozov V. I.,
Fomin A. V.
Publication year - 1982
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221140220
Subject(s) - amorphous solid , metastability , hydrogen , materials science , electrical resistivity and conductivity , bismuth , superconductivity , analytical chemistry (journal) , phase (matter) , substrate (aquarium) , condensed matter physics , crystallography , chemistry , metallurgy , physics , organic chemistry , geology , oceanography , quantum mechanics
Electric and superconducting properties of Bi films condensed in the H 2 atmosphere ( p H 2 = = 5 × 10 −6 to 2 × 10 −5 Torr) onto a liquid‐helium‐cooled substrate are studied. The dissolved hydrogen is found to increase essentially the resistivity Q , to suppress T c and raise the amorphous—crystalline transition temperature T ac . If p H 2 exceeds some critical values, the films prepared are in the metastable phase, a‐Bi(H), highly saturated with hydrogen. At about 5 K this phase transforms into ordinary, also metastable, amorphous Bi, which results in a sharp decrease of the normal resistance (down to two orders of magnitude) and a T c rise (up to 2 K). In a number of cases this transition proceeds as a heating‐induced jump from the resistive to the superconducting state. The properties of pure and hydrogen‐saturated Bi films are thoroughly compared. The results obtained are discussed on the base of the up‐to‐date knowledge.