Recent measurements of dipolar-octupolar rare earth pyrochlores

          @misc{ scivideos_PIRSA:17060041,
            doi = {10.48660/17060041},
            url = {https://pirsa.org/17060041},
            author = {Lake, Bella},
            keywords = {Quantum Matter},
            language = {en},
            title = {Recent measurements of dipolar-octupolar rare earth pyrochlores},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2017},
            month = {jun},
            note = {PIRSA:17060041 see, \url{https://scivideos.org/pirsa/17060041}}
          }
          

Abstract

This talk will outline recent measurements on the dipolar-octupolar rare earth pyrochlores Nd2Zr2O7 and Nd2Hf2O7. Measurements of their crystal field excitations allows the wavefunction of their ground state Kramer’s doublet to be determined. Both compounds develop long-range magnetic order and their Hamiltonians are extracted by comparing inelastic neutron scattering data to spin-wave theory at low temperatures. The Hamiltonians are used to qualitatively explain AC magnetization measurements as well as neutron data collected in an applied magnetic field. Both system as predicted to lie close to a U(1) spin liquid and the excitation spectrum above the Néel temperature is compared to calculations for bosonic many body quantum spin ice.