Magnetic Hamiltonian and phase diagram of the quantum spin liquidCa10Cr7O28

A spin liquid is a new state of matter with topological order where the spin moments continue to fluctuate coherently down to the lowest temperatures rather than develop static long-range magnetic order as found in conventional magnets. For spin liquid behavior to arise in a material the magnetic Hamiltonian must be ``frustrated'', where the combination of lattice geometry, interactions, and anisotropies gives rise to competing spin arrangements...