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Persistent URL	http://purl.org/net/epubs/work/64351
Record Status	Checked
Record Id	64351
Title	Ground State in a Half-Doped Manganite Distinguished by Neutron Spectroscopy
Contributors	G Johnstone (Oxford U.), T Perring (STFC Rutherford Appleton Lab.), O Sikora (Bristol U.), D Prabhakaran (Oxford U.), A Boothroyd (Oxford U.)
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.
Organisation	ISIS , ISIS-MAPS , STFC
Keywords	Physics , ISIS 2013
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Language	English (EN)

Type	Details	URI(s)	Local file(s)	Year
Journal Article	Phys Rev Lett 109, no. 23 (2012): 237202.	doi:10.1103/PhysRevLett.109.237202		2012