  Since the nature of pairing interactions is manifested in the superconducting
gap symmetry, the exact gap structure, particularly any deviation from the
simple d_{x^2-y^2} symmetry, would help elucidating the pairing mechanism in
high-T_c cuprates. Anisotropic heat transport measurement in
Bi_{2}Sr_{2}CaCu_{2}O_{8+\delta} (Bi-2212) reveals that the quasiparticle
populations are different for the two nodal directions and thus the gap
structure must be uniquely anisotropic, suggesting that pairing is governed by
interactions with a rather complicated anisotropy. Intriguingly, it is found
that the "plateau" in the magnetic-field dependence of the thermal conductivity
is observed only in the b-axis transport.
