62 citations · 101 across the 8 of their papers we have counts for
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cond-mat.str-el2001★ 11 cited
Low Energy Singlets in the Excitation Spectrum of the Spin Tetrahedra System Cu_2Te_2O_5Br_2
P. Lemmens, K. Y. Choi, A. Ionescu +8
Low energy Raman scattering of the s=1/2 spin tetrahedra system Cu_2Te_2O_5Br_2 is dominated by an excitation at 18 cm^{-1} corresponding to an energy E_S=0.6Δ, with Δthe spin gap…
cond-mat.str-el2001★ 7 cited
Charge kinks as Raman scatterers in quarter-filled ladders
E. Ya. Sherman, C. Ambrosch-Draxl, P. Lemmens +2
Charge kinks are considered as fundamental excitations in quarter-filled charge-ordered ladders. The strength of the coupling of the kinks to the three-dimensional lattice depends…