TY - JOUR
T1 - Quantum features in the spin dynamics of S=1/2 and 1 Heisenberg antiferromagnets in spite of long-range ordered phases
AU - Enderle, M.
AU - Kiefer, K.
AU - Klopperpieper, A.
AU - Albers, J.
AU - McIntyre, G.J.
AU - Lefmann, K.
AU - Schmidt, W.
AU - Kamp, R. van de
PY - 2000
Y1 - 2000
N2 - Uniform S = 1 and 1/2 Heisenberg antiferromagnetic chains have a quantum singlet ground state which is an eigenstate of the total spin with S(tot) = 0. However, the 'internal' order of these ground states is quite different, and is reflected in gapless excitations in the S = 1/2 state, while the S = 1 chain has a triplet excitation gap known as the Haldane gap. The exchange interactions of the antiferromagnets CsNiCl(3) (S = 1) and Cu-tetraminsulfate (S = 1/2) are quasi-one dimensional, leading to long-range ordered Neel ground states. Nevertheless, we find evidence of quantum spin dynamics. (C) 2000 Elsevier Science B.V. All rights reserved.
AB - Uniform S = 1 and 1/2 Heisenberg antiferromagnetic chains have a quantum singlet ground state which is an eigenstate of the total spin with S(tot) = 0. However, the 'internal' order of these ground states is quite different, and is reflected in gapless excitations in the S = 1/2 state, while the S = 1 chain has a triplet excitation gap known as the Haldane gap. The exchange interactions of the antiferromagnets CsNiCl(3) (S = 1) and Cu-tetraminsulfate (S = 1/2) are quasi-one dimensional, leading to long-range ordered Neel ground states. Nevertheless, we find evidence of quantum spin dynamics. (C) 2000 Elsevier Science B.V. All rights reserved.
KW - Nye funktionelle materialer
U2 - 10.1016/S0921-4526(99)01645-2
DO - 10.1016/S0921-4526(99)01645-2
M3 - Journal article
SN - 0921-4526
VL - 276-278
SP - 782
EP - 783
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
ER -