Spin diffusion of the {ital t}-{ital J} model

Journal Article · Thu Jun 01 04:00:00 EDT 1995 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.51.16083· OSTI ID:54973

Bonca, J ^[1]; Jaklic, J ^[2]

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1. Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
2. Jozef Stefan Institute, University of Ljubljana, 61111 Ljubljana (Slovenia)

The spin-diffusion constant of the two-dimensional {ital t}-{ital J} model is calculated using an analytical approach at high temperatures and a recently developed numerical method based on the Lanczos technique combined with random sampling in the intermediate temperature regime. A simple relation, {sigma}={ital D}{sub {ital s}}{chi}, between spin conductivity and spin diffusion is established and used to calculate the latter. In the high-temperature and low-doping limit, the calculated diffusion constant agrees with known results for the Heisenberg model. At small hole doping, {ital D}{sub {ital s}} increases approximately linearly with doping, which leads us to an important conclusion that hopping processes enhance spin diffusion at high temperatures. At modest hole doping, {delta}{similar_to}0.25, diffusion exhibits a nonmonotonic temperature dependence, which indicates anomalous spin dynamics at small frequencies.

• Sponsoring Organization: USDOE
• OSTI ID: 54973
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 22 Vol. 51; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
DIFFUSION
HEISENBERG MODEL
HIGH-TC SUPERCONDUCTORS
NUMERICAL SOLUTION
SPIN
STATISTICAL MODELS
TEMPERATURE DEPENDENCE
TWO-DIMENSIONAL CALCULATIONS