2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/29118In underdoped YBa_2Cu_3O_x (YBCO) with x = 6.63, the opening of the pseudogap at T^* ~ 160 K has a strong effect on the Hall angle tan(theta). While the Hall response is significantly reduced, the diagonal current is relatively unaffected. The Hall conductivity suppression continues deep into the flux-flow state (from T_c to 40 K), as an anomalous suppression of the vortex Hall current.4 pages in RevTex, 4 eps figures, changed contentSuperconductivitytext