Berlin 2018 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 100: Frustrated Magnets - Pyrochlore Oxides
TT 100.7: Talk
Thursday, March 15, 2018, 17:15–17:30, H 3005
Features of quantum spin ice in pyrochlore Nd2Zr2O7 — •Jianhui Xu1,2, A. T. M. Nazmul Islam1, Owen Benton3, Georg Ehlers4, and Bella Lake1,2 — 1Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany — 2Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstraße 36, D-10623 Berlin, Germany — 3RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan — 4Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
Magnetic pyrochlore oxides are intensively studied in the field of frustrated magnetism and the pyrochlores with Ising-anisotropic light rare earth are candidates for quantum spin ice. The recent studies on Nd2Zr2O7 show that the single-ion ground state of Nd3+ is a well-isolated Kramers doublet with Ising anisotropy and the collective ground state is an antiferromagnetic order. Inelastic neutron scattering shows magnetic excitations containing a flat gapped ice-like mode and dispersive branches. The analyses based on spin wave theory indicate quantum moment fragmentation and yield a pseudospin-1/2 Hamiltonian which suggests quantum spin ice state above the ordering temperature (0.4K). Here we show that the extracted spin Hamiltonian gives a qualitative description of the macroscopic properties of Nd2Zr2O7 based on mean-field and Monte Carlo simulations. We also present single-crystal inelastic neutron scattering data above TN at 450mK and compare with the calculated spinon scattering.