Abstract：
:α-MnO2 nanotubes were fabricated using a hydrothermal technique. Li, Na and K ions were introduced into MnO2 nanotubes to tailor their magnetic properties. It was found that with a doping concentration lower than 12 at%, the nanotubes showed ferromagnetic-like ordering at low temperature (<50 K), while antiferromagnetic coupling dominated their physical behavior with doping concentrations beyond 12 at%. Such experimental phenomenon was in very good agreement with associated first principle calculations. The ferromagnetic-like ordering originates from the breaking of equivalence between two different Mn-O octahedrals in α-MnO2 due to the filling of alkaline ions in the tunnels. Both small charge transfer and lattice distortion play important roles in the ferromagnetic ordering.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Tseng LT,Lu Y,Fan HM,Wang Y,Luo X,Liu T,Munroe P,Li S,Yi Jdoi
10.1038/srep09094subject
Has Abstractpub_date
2015-03-13 00:00:00pages
9094issn
2045-2322pii
srep09094journal_volume
5pub_type
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