TY - JOUR
T1 - Magnetic excitations from the singlet ground state in the S=1/2 quasi-one-dimensional sys
AU - Matsuda, M.
AU - Katsumata, K.
AU - Eisaki, H.
AU - Motoyama, N.
AU - Uchida, S.
PY - 1996
Y1 - 1996
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0000886585&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.54.12199
DO - 10.1103/PhysRevB.54.12199
M3 - Article
AN - SCOPUS:0000886585
SN - 1098-0121
VL - 54
SP - 12199
EP - 12206
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 17
ER -