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Scaling plot of thermal Hall conductivity
k
xy in BZO-grown YBCO crystal. The k- linear dispersion of the qp energy implies that
k
xy/
T
^2 depends on the universal function
Fxy(u)
where the dimensionless argument
u = sqrt (H)/T
[Simon and Lee, PRL 1997]. The plots of
k
xy/
T
^2 versus
u
show that, below 30 K, the curves approach the non-monotonic function which appears as an envelope. The measurements show that the universal function
Fxy
is nearly linear in its argument, viz.
Fxy~u
for small
u
. [Y. Zhang et al.]
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