Strong coupling of a Gd${}^{3+}$ multilevel spin system to an on-chip superconducting resonator

Giovanni Franco-Rivera, Josiah Cochran, Seiji Miyashita +2

We report the realization of a strong coupling between a Gd${}^{3+}$ spin ensemble hosted in a scheelite (CaWO${}_4$) single crystal and the resonant mode of a coplanar stripline super…