Magnetic Susceptibility Scaling inLa2−xSrxCuO4−y

Abstract

The powder magnetic susceptibility $\chi \mathrm{}\left(T\right)\mathrm{}$ of ${\mathrm{La}}_{2-x}{\mathrm{Sr}}_x\mathrm{Cu}{\mathrm{O}}_{4-y}$ is found to scale with doped hole concentration $p=x-2y$ according to a law of corresponding states for $0\le p\le 0.20$, thereby allowing ${\chi }^{\mathrm{Pauli}}\mathrm{}\left(p\right)\mathrm{}$ of the holes and ${\chi }^{2\mathrm{D}}(p, T)$ of the ${\mathrm{Cu}}^{+2\mathrm{}}$ spin sublattice to be separated and precisely evaluated. ${\chi }^{\mathrm{Pauli}}$ increases with $p$. The shape of ${\chi }^{2\mathrm{D}}\mathrm{}\left(T\right)\mathrm{}$ is that of the spin-½ square-lattice Heisenberg antiferromagnet; however, by $p=0.20\mathrm{}$, the in-plane Cu-Cu superexchange coupling constant and effective magnetic moment per Cu ion are both largely suppressed.