Observation of weak-limit quasiparticle scattering via broadband microwave spectroscopy of a d-wave superconductor.
There has long been a discrepancy between microwave conductivity measurements in high temperature superconductors and the conductivity spectrum expected in the simplest models for impurity scattering in a d-wave superconductor. Here we present a new type of broadband measurement of microwave surface resistance that finally shows some of the spectral features expected for a d(x2-y2) pairing state. Cusp-shaped conductivity spectra, consistent with weak impurity scattering of nodal quasiparticles, were obtained in the 0.6-21 GHz frequency range in highly ordered crystals of YBa2Cu3O6.50 and YBa2Cu3O6.99.
Turner
P J
PJ
Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1.
Harris
R
R
Kamal
Saeid
S
Hayden
M E
ME
Broun
D M
DM
Morgan
D C
DC
Hosseini
A
A
Dosanjh
P
P
Mullins
G K
GK
Preston
J S
JS
Liang
Ruixing
R
Bonn
D A
DA
Hardy
W N
WN