Phys. Rev. B 64, 092403 (2001) [4 pages]

Theory of spin-wave excitations of metallic A-type antiferromagnetic manganites

Abstract

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G. Jackeli^1,2,*, N. B. Perkins¹, and N. M. Plakida¹
¹Joint Institute for Nuclear Research, Dubna, Moscow region, 141980, Russia
²Max-Planck-Institut för Physik komplexer Systeme, Nöthnitzer Strasse 38, 01187 Dresden, Germany

Received 10 December 2000; published 7 August 2001

The spin dynamics of the metallic A-type antiferromagnetic manganites is studied. An effective nearest-neighbor Heisenberg spin-wave dispersion is derived from the double-exchange model taking into account the superexchange interaction between the core spins. The result of inelastic neutron-scattering experiment on Nd_0.45Sr_0.55MnO₃ is qualitatively reproduced. Comparing theory with experimental data, two main parameters of the model—nearest-neighbor electron-transfer amplitude and superexchange coupling between the core spins—are estimated.

URL:

http://link.aps.org/doi/10.1103/PhysRevB.64.092403

DOI:

10.1103/PhysRevB.64.092403

PACS:

75.30.Ds, 75.10.Lp, 75.30.Vn

^*Permanent address: Institute of Physics, Georgian Academy of Sciences, Tbilisi, Georgia.

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Phys. Rev. B 64, 092403 (2001) [4 pages]

Theory of spin-wave excitations of metallic A-type antiferromagnetic manganites