Spin dynamics in the square-lattice cupola system Ba(TiO)Cu${}_4$(PO${}_4$)${}_4$

Luc Testa, Peter Babkevich, Yasuyuki Kato +9

We report high-resolution single-crystal inelastic neutron scattering measurements on the spin-1/2 antiferromagnet Ba(TiO)Cu${}_4$(PO${}_4$)${}_4$. This material is formed from layers of…