Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Infrared evidence for gap anisotropy in YBa sub 2 Cu sub 3 O sub 7

Journal Article · · Physical Review Letters; (USA)
; ; ;  [1]
  1. IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598 (US)
Infrared reflectivity measurements of crystalline YBa{sub 2}Cu{sub 3}O{sub 7} ({ital T}{sub {ital c}}{congruent}92 K) are performed with the electric field both parallel and perpendicular to the Cu-O planes. We find evidence for an unusually large in-plane energy gap ({similar to}8{ital kT}{sub {ital c}}), while a much smaller energy scale ({similar to}3{ital kT}{sub {ital c}}) is obtained with the field perpendicular to the planes suggesting substantial gap anisotropy. Temperature-dependent measurements near {ital T}{sub {ital c}} demonstrate a clear relationship between the development of the {similar to}8{ital kT}{sub {ital c}} feature and the superconducting transition.
OSTI ID:
5485337
Journal Information:
Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 63:4; ISSN PRLTA; ISSN 0031-9007
Country of Publication:
United States
Language:
English