Structural and magnetic short-range order in fluorite Yb2TiO5

Article

关键词: ZERO-POINT ENTROPY;    SPIN-ICE;    TITANATE PYROCHLORES;    TOTAL SCATTERING;    OXIDES;    FRUSTRATION;    MONOPOLES;    DISORDER;    HO2TI2O7;    SERIES;   

DOI  :  10.1103/PhysRevB.96.174418

来源: SCIE

【 摘 要 】

We studied structural andmagnetic ordering in Yb2TiO5 using synchrotron x-ray diffraction, neutron diffraction and total scattering, ac and dc susceptibility, and inelastic neutron scattering. Diffraction measurements reveal an average disordered fluorite structure with additional diffuse scattering features, which are caused by structural short-range orthorhombic order, as evidenced by the neutron pair distribution function measurements. The ac susceptibility measurements show a broad peak at T-f approximate to 0.35 K that displays Arrhenius behavior with an activation energy of 2.51(5) meV. Zero-field neutron scattering measurements show broad magnetic diffuse scattering in the elastic channel with an antiferromagnetic-type gapless excitation extending to 1.5 meV. A polarized state with partial spin order is induced with an applied magnetic field which opens a gapped excitation that increases monotonically with field strength.

【 授权许可】

Free