Infrared-active phonons and the superconducting gap of T~c-reduced double-chain YBa~2Cu~4O~8 superconductors
Litvinchuk, A. P. et al.
Physical review. B, Condensed matter and materials physics. VOL 50; NUMBER 2, ; 1994, 1171 -- AMERICAN PHYSICAL SOCIETY Part: Part 2; -- 1994
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