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in creator/contributor: "Kakurai, K."

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MAGNETIC EXCITATIONS AND DOUBLE GAP IN THE S=1/2 LINEAR CHAIN QUANTUM ANTIFERROMAGNET BaCu{sub 2}Si{sub 2}O{sub 7}

The magnetic excitation spectrum of the ideal S=1/2 1-dimensional quantum antiferromagnet (AF), contains no single-mode contributions, and, in fact, can be described as a 2-particle continuum of spinons. Chain-MF theory predicts that a weakly coupled chains system becomes ordered at low temperatures. In the ordered state a sharp magnon excitation is present. The continuum persists, but is separated from the magnon branch by an appreciable energy gap. On the other hand, if weakly coupled chains … more

Date: March 16, 2000

Creator: Raymond, S.; Zheludev, A.; Masuda, T.; Kakurai, K.; Ressouche, E. & Wildes, A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Magnetic Excitation of CuGeO{sub 3} under Applied Pressure

Magnetic excitations of the spin-Peierls compound CuGeO{sub 3} under applied pressure of 2 GPa have been studied. The dispersion along the chain direction up to zone boundary has been obtained. The spin-Peierls gap energy increases to 4.2 meV and the zone boundary energy decreases to 14.1 meV. The pressure dependence of dispersion relation can be interpreted by the increase of the next-nearest-neighbor intra-chain interaction under applied pressure causing the increase of both the spin-Peierls … more

Date: July 31, 1997

Creator: Nishi, M.; Kakurai, K.; Fujii, Y.; Yethiraj, M.; Tennant, D. A.; Nagler, S. E. et al.

Item Type: Article