Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-01-09
Phys. Rev. B67, 094402 (2003)
Physics
Condensed Matter
Strongly Correlated Electrons
13 pages, Revtex, four figures are included
Scientific paper
10.1103/PhysRevB.67.094402
The dynamical spin response of doped two-leg ladder antiferromagnets is investigated based on the fermion-spin approach. Our calculations clearly demonstrate a crossover from the incommensurate antiferromagnetism in the weak interchain coupling regime to commensurate spin fluctuation in the strong interchain coupling regime. In particular, the nuclear spin-lattice relaxation rate extracted from the commensurate spin fluctuation decreases exponentially with decreasing temperatures. The behaviors of the spin dynamics in the strong coupling regime are quantitatively close to the experimental results of Sr_{14-x}Ca_{x}Cu_{24}O_{41}.
Chen* Wei Yeu
Feng Shiping
He Jianhui
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