Magnetic excitations from the singlet ground state in the S=1/2 quasi-one-dimensional sys

M. Matsuda, K. Katsumata, H. Eisaki, N. Motoyama, S. Uchida

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Abstract

Inelastic neutron scattering measurements have been performed on the S=1/2 quasi-one-dimensional system (Formula presented)(Formula presented)(Formula presented)(Formula presented), which has both simple chains and two-leg ladders of copper ions. Strong magnetic inelastic peaks, which originate from the simple chains, have been observed at 9-14 meV in (Formula presented)(Formula presented)(Formula presented). These spin gaps have been confirmed to originate from a dimerized state of the chain. The dimers are formed between spins which are separated by 2 and 4 times the distance between the nearest-neighbor copper ions in the simple chain. In addition, a weaker magnetic inelastic peak around 11 meV, which originates from a dimerized state in the ladder, has also been observed. These dimers are formed between the nearest-neighbor copper ions which are connected by the interladder coupling. We have also studied the effect of (Formula presented) substitution for (Formula presented) site on the dimerized states. It was found that the yttrium substitution suppresses the gap energies drastically. Possible origins of the dimerized ground state and the excitations are discussed.

Original languageEnglish
Pages (from-to)12199-12206
Number of pages8
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume54
Issue number17
DOIs
StatePublished - 1996
Externally publishedYes

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