Disappearance of antiferromagnetic spin excitations in over-doped La${}_{2-x}$Sr${}_x$CuO${}_4$

S. Wakimoto, K. Yamada, J. M. Tranquada +3

Magnetic excitations in the energy range up to 100 meV are studied for over-doped La${}_{2-x}$Sr${}_x$CuO${}_4$ with $x=0.25$ and 0.30, using time-of-flight neutron spectroscopy. Com…