Thermal Conductivity as a Probe of Quasi-Particles in the Cuprates

N. P. Ong, K. Krishana, Y. Zhang +1

In underdoped YBa_2Cu_3O_x (x=6.63), the low-T thermal conductivity Kappa_xx varies steeply with field B at small B, and saturates to a nearly field-independent value at high field…