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Physical Properties of Thorium under Pressure
Author(s) -
Mahalingam A.,
Vidya K.,
Kalpana G.,
Palanivel B.,
Rajagopalan M.
Publication year - 1993
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.2221780118
Subject(s) - electrical resistivity and conductivity , superconductivity , thorium , fermi surface , fermi level , electronic band structure , condensed matter physics , tin , physics , topology (electrical circuits) , chemistry , materials science , mathematics , quantum mechanics , nuclear physics , metallurgy , electron , uranium , combinatorics
A theoretical calculation of the band structure, electrical resistivity, and superconductivity of f.c.c. thorium under pressure is reported. The effect of pressure on the band structure is obtained by means of the linear muffin‐tin orbital (LMTO) method. The superconducting transition temperature ( T c ) is calculated using McMillan's as well as Allen‐Dyne's modified formulae. The parameters necessary to calculate T c are taken from the band structure outputs. The calculated values of T c initially decrease with the increase in pressure up to 154 × 10 8 Pa and then begin to increase. The sudden increase in the value of T c around 181 × 10 8 Pa is attributed to the change in the Fermi surface topology. The theoretically calculated values of resistivity initially decrease with increase in pressure up to 154 × 10 8 Pa and then begin to increase in accordance with the experimental results. The change in slope around 181 × 10 8 Pa may be due to a change in Fermi surface topology. The calculated values of ϱ are in correct trend with the experimental values.