Sum rules and interlayer infrared response of the high temperature YBa2Cu3Oy superconductor in an external magnetic field.
We present infrared magneto-optical measurements of the c-axis conductivity of YBa2Cu3Oy in both the underdoped (y=6.67 and 6.75) and optimally doped (y=6.95) regimes. We show that modest c-axis magnetic fields radically modify the condensate formation and restore conventional BCS-like energetics. Additionally, we demonstrate the pivotal role of interplane coherence in the anomalous high-energy contribution to the superfluid density.
LaForge
A D
AD
Department of Physics, University of California, San Diego, La Jolla, California 92093, USA. alaforge@physics.ucsd.edu
Padilla
W J
WJ
Burch
K S
KS
Li
Z Q
ZQ
Schafgans
A A
AA
Segawa
Kouji
K
Ando
Yoichi
Y
Basov
D N
DN