作者: Hiroyuki Yamase , Walter Metzner
DOI: 10.1016/J.PHYSC.2007.03.429
关键词:
摘要: Abstract A pronounced xy -anisotropy was observed in recent neutron scattering experiments for magnetic excitations untwinned YBa 2 Cu 3 O 6+ y (YBCO). The small anisotropy of the bare band structure due to orthorhombic crystal symmetry seems be enhanced by correlation effects. natural possibility is that system close a Pomeranchuk instability associated with d-wave Fermi surface deformation (dFSD). We investigate this bilayer t – J model within self-consistent slave-boson mean-field theory. show dFSD correlations drive at low doping and relatively high temperatures, providing scenario optimally doped as well underdoped YBCO, including pseudogap phase.