Russek, S.
, Sulewski, P.
, Sievers, A.
, Hallen, H.
, Lathrop, D.
and Buhrman, R.
(1987),
Measurement of the superconducting energy gap in La-Ba-Cu oxide and La-Sr-Cu oxide, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=905792
(Accessed October 13, 2025)
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Measurement of the superconducting energy gap in La-Ba-Cu oxide and La-Sr-Cu oxide
Published
Author(s)
, P. E. Sulewski, A.J. Sievers, H. D. Hallen, D. K. Lathrop, R A. Buhrman
Abstract
We report on far-infared (FIR) reflectivity measurements on sintered pressed poweder samples of La-Ba-Cu oxide and La-Sr-Cu oxide. THe best samples show fairly sharp transitions to zero measurable resistance with a transition midpoint of 28 K for the Ba alloy and 36 K for the Sr alloy. The FIR measurements reveal an energy gap below Tc with, depending on the measurement criterion used, values of 2delta/kbTc of 1.3-1.95 for La-Ba-Cu oxide and 1.6-2.7 for La-Sr-Cu oxide, which are lower than expected for a BCS superconductor.Citation
Physical Review B
Volume
35
Pub Type
Journals
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Citation
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Created April 1, 1987, Updated February 19, 2017