Electron localization into spin-polaron state in MnSi

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2011-04-13
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Storchak, Vyacheslav
Brewer, Jess
Lichti, Roger
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Schlagel, Deborah
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Lograsso, Thomas
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Ames National Laboratory

Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.

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Strong electron localization into a bound state has been found in both paramagnetic and ferromagnetic states of the transition metal compound MnSi by muon spin-rotation spectroscopy in magnetic fields up to 7 T and from 2 K to room temperature. This bound state, with a characteristic radius R≈0.4 nm and net spin S=24±2, is consistent with confinement of the electron’s wave function within roughly one lattice cell of MnSi and is suggested to be a spin polaron. Such spin polarons may form due to a strong exchange interaction between itinerant electrons and the magnetic electrons of Mn ions of the same 3d type; as such, they might affect the peculiar electronic and magnetic properties of MnSi.

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This article is from Physical Review B 83 (2011): 410404(R), doi:10.1103/PhysRevB.83.140404.

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Sat Jan 01 00:00:00 UTC 2011
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