Ground state in a half-doped manganite distinguished by neutron spectroscopy

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.

Published in Physical Review Letters. Supplementary material is available from the corresponding authors

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• Buckling induced Zener polaron instability in half-doped manganites

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• Upgrade to the MAPS neutron time-of-flight chopper spectrometer
• Interpretable, calibrated neural networks for analysis and understanding of inelastic neutron scattering data
• Spin excitations used to probe the nature of the exchange coupling in the magnetically ordered ground state of Pr${}_{0.5}$Ca${}_{0.5}$MnO${}_3$
• Magnon dressing by orbital excitations in ferromagnetic planes of K${}_2$CuF${}_4$ and LaMnO${}_3$
• Emergent ferromagnetic ladder excitations in heavy fermion superconductor CeSb${}_2$
• Quantum magnons of the intermediate phase of half-doped manganite oxides