95 citations · 211 across the 7 of their papers we have counts for
7 papers
Charge density waves in Sr_14-xCa_xCu_24O_41: electron correlations vs. structural effects
K. -Y. Choi, M. Grove, P. Lemmens +7
We report inelastic light scattering experiments in the spin-chain and ladder system Sr_14-xCa_xCu_24O_41. A depletion of an electronic background is observed for 0 < x < 5 at low…
Structural Phase Transition in the 2D Spin Dimer Compound SrCu2(BO3)2
K. Sparta, G. J. Redhammer, P. Roussel +11
A displacive, 2nd order structural phase transition at Ts=395 K from space group I`4 2 m below Ts to I 4/m c m above Ts has been discovered in the two-dimensional spin dimer compou…
Collective Singlet Excitations and Evolution of Raman Spectral Weights in the 2D Spin Dimer Compound SrCu2(BO3)2
Peter Lemmens, M. Grove, M. Fischer +5
We present a Raman light scattering study of the two-dimensional quantum spin system SrCu2(BO3)2 and show that the magnetic excitation spectrum has a rich structure, including seve…
Magnetoelastic coupling and spin excitations in the spin-gap system (VO)PO: A Raman scattering study
M. Grove, P. Lemmens, G. Güntherodt +3
Single crystals of the spin-gap system have been investigated by means of Raman scattering. At temperatures below T=75 K~, with $Δ_{0…
Quantum Spin Systems: From Spin Gaps to Pseudo Gaps
P. Lemmens, M. Fischer, M. Grove +5
Many low dimensional spin systems with a dimerized or ladder-like antiferromagnetic exchange coupling have a gapped excitation spectrum with magnetic bound states within the spin g…
Stripe Conductivity in La(1.775)Sr(0.225)NiO(4)
Yu. G. Pashkevich, V. A. Blinkin, V. P. Gnezdilov +10
We report Raman light-scattering and optical conductivity measurements on a single crystal of La(1.775)Sr(0.225)NiO(4) which exhibits incommensurate charge-stripe order. The extra…