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[Top inset] The zero-field thermal conductivity
k
xx of a
BZO
(BaZrO_3)-grown YBCO (
y
= 6.993) crystal (solid symbols) compared with
k
xx in a
YSZ
-grown YBCO crystal (
y
= 6.95, open symbols). In both, the gradient (-grad
T
) is applied along the a-axis (normal to chains). The
BZO
crystal has a much larger
k
xx anomaly.
The main panel shows plots of the thermal Hall conductivity
k
xy versus field (
H || c
) at temperatures 40-85 K in the
BZO
crystal. Starting below
T
c, the weak-field slope
k
xy^0/
B
increases very steeply by a factor of 1000. The strong non-monotonic field dependence at low temperatures reflects shortening of the mfp by scattering from disorder in the vortex lattice. [Y. Zhang et al., cond-mat/00xxxx].
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