Terahertz Frequency Electromagnon and Magnon Modes in Multiferroic Cupric Oxide
Institute of Electrical and Electronics Engineers (IEEE) (2013) 1-1
Dynamical matrix diagonalization for the calculation of dispersive excitations (vol 24, 213201, 2012)
JOURNAL OF PHYSICS-CONDENSED MATTER 25:32 (2013) ARTN 329501
Ground state in a half-doped manganite distinguished by neutron spectroscopy
Physical Review Letters 109:23 (2012)
Abstract:
We have measured the spin-wave spectrum of the half-doped bilayer manganite Pr(Ca,Sr)2Mn2O7 in its spin, charge, and orbital ordered phase. The measurements, which extend throughout the Brillouin zone and cover the entire one-magnon spectrum, are compared critically with spin-wave calculations for different models of the electronic ground state. The data are described very well by the Goodenough model, which has weakly interacting ferromagnetic zig-zag chains in the CE-type arrangement. A model that allows ferromagnetic dimers to form within the zigzags is inconsistent with the data. The analysis conclusively rules out the strongly bound dimer (Zener polaron) model. © 2012 American Physical Society.Ground state in a half-doped manganite distinguished by neutron spectroscopy
(2012)
Strongly momentum-dependent screening dynamics in La$_{0.5}$Sr$_{1.5}$MnO$_4$ observed with resonant inelastic x-ray scattering
(2012)