The Spin-Wave Continuum of the S = 1/2 Linear Heisenberg Antiferromagnet

Authors

Gerhard Müller, University of Rhode IslandFollow
Harry Thomas
Hans Beck

Document Type

Article

Date of Original Version

1980

Abstract

In the S=½ linear Heisenberg antiferromagnet (HB AF)

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although investigated by various theoretical approaches -many important questions concerning the statics and the dynamics have remained open. Recent low-temperature neutron-scattering experiments on CuCl₂ • ₂N(C₅H₅) (CPC), which is a good realization of an S=½ HB AF chain, provided new important information on the dynamics of the system, such as lineshapes and the behaviour in a magnetic field /1/. The important quantity for direct comparison with experiments of this kind is the dynamic spin-correlation function in (q,ω) -space. It is the Fourier transform of < S^z (l. t) S^z (l', o) > and for T = o it can be written as

G_zz(q,ω) = Σ_λ M_λδ(ω + E_O - E_λ), M_λ = 2π|< o||S^z(q)||λ >|²

Citation/Publisher Attribution

Müller G., Thomas H., Beck H. (1980) The Spin-Wave Continuum of The S=1/2 Linear Heisenberg Antiferromagnet. In: Riste T. (eds) Ordering in Strongly Fluctuating Condensed Matter Systems. NATO Advanced Study Institutes Series (Series B: Physics), vol 50. Springer, Boston, MA.

Available at: http://dx.doi.org/10.1007/978-1-4684-3626-6_12