October 2016

Journal

Long-range magnetic order and interchain interactions in the S=2chain systemMnCl3(bpy)

By:
Fishman, Randy S; Shinozaki, Shin-ichi; Okutani, Akira; Yoshizawa, Daichi; Kida, Takanori; Hagiwara, M.; Meisel, Mark
Journal Name:
Physical Review B
Page Number:
104435-104439
Volume:
94
Issue Number:
10
Publication Date:
October 2016
View DOI Listing:
https://doi.org/10.1103/PhysRevB.94.104435

Abstract

Acompoundwithveryweaklyinteractingchains,MnCl3(bpy),hasattractedagreatdealofat-tentionasapossibleS=2Haldanechain.However,long-rangemagneticorderofthechainsbelow11.5KpreventstheHaldanegapfromdeveloping.Usingafour-sublatticemodel,theantiferromag-neticresonance(AFMR)spectrumuptofrequenciesof1.5THzandmagneticfieldsupto50TiswelldescribedwhentheinterchaincouplingisindeedquitesmallbuttheDzaloshinskii-Moriyainteractionproducedbybrokeninversionsymmetryissubstantial(0.12meV).Inaddition,thean-tiferromagnetic,nearest-neighborspininterchaininteractionassumesavalue(3.3meV)whichissignificantlystrongerthanpreviouslyreported.TheexcitationspectrumofthisS=2compoundiswell-describedbya1/Sexpansionabouttheclassicallimit.