Fractional Spin Excitations in the Infinite-Layer Cuprate CaCuO2 All high-temperature superconducting cuprates share a fundamental building block: CuO2 layers arranged in a square lattice, each site having a single unpaired spin that interacts with its neighbors through strong antiferromagnetic couplings. The simplicity of the structure, however, veils a deeper complexity: Theoretical studies suggest that this spin-1/2 square-lattice … Continue reading Fractional Spin Excitations in the Infinite-Layer Cuprate CaCuO2