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Specific heat of the ceramic superconductor Bi2Sr2CuO6 from 0.4 to 20 K

✍ Scribed by S.J. Collocott; R. Driver; C. Andrikidis

Publisher: Elsevier Science
Year: 1991
Tongue: English
Weight: 567 KB
Volume: 173
Category: Article
ISSN: 0921-4534
DOI: 10.1016/0921-4534(91)90802-6

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✦ Synopsis

Specific heat, Cp, data in the range 0.4 to 20 K for three polycrystalline specimens of Bi2Sr2CuO6 (2 : 2: 0: 1 phase, T¢ ~ 8 K) are reported and compared with similar measurements made on Bi2SrLa3Cao.67CuO6 (Tc ~ 20 K) which is also of the 2:2:0:1 phase, but with partial substitution of Ca for Sr. No anomaly in Cp at Tc is observed in any of the specimens. Below ~ 2 K, an upturn in Cp/T is observed in all specimens. The coefficient of the linear term in Cp, Yo, is non-zero in all specimens, and is in the range 3 to 10 mJ / (mol K 2 ). A limiting value for the Debye temperature, 0 °, of 220 _+ 8 K is obtained.

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