Universal spin response in copper oxide materials
Universal spin response in copper oxide materials
The spin response in the copper oxide materials at finite temperatures in the underdoped and optimal doped regimes is studied within the framework of the fermion-spin theory. The integrated dynamical spin structure factor is almost temperature independent, the integrated susceptibility shows the particularly universal behavior as $I(\ensuremath{\omega},T)\ensuremath{\propto}\mathrm{arctan}[{a}_{1}\ensuremath{\omega}{/T+a}_{3}(\ensuremath{\omega}{/T)}^{3}]$, and the spin-lattice …