Regensburg 2010 – scientific programme
Parts | Days | Selection | Search | Downloads | Help
TT: Fachverband Tiefe Temperaturen
TT 11: CE: Low-dimensional Systems - Materials 2
TT 11.6: Talk
Tuesday, March 23, 2010, 10:45–11:00, H18
Magnetic properties of the spin chain compound Li2CuO2 — •W.E.A. Lorenz1, S.-L. Drechsler1, R.O. Kuzian2, W.-D. Stein3, N. Wizent1, G. Behr1, A. Hiess4, W. Schmidt5, S. Petit6, K. Nenkov1, M. Loewenhaupt3, R. Klingeler1, and B. Büchner1 — 1Leibniz-Inst. f. Festkörper- & Werkstoffforschung, Dresden, Germany — 2Inst. f. Problems of Materials Science, Kiev, Ukraine — 3Inst. f. Festkörperphysik, TU Dresden — 4Inst. Laue Langevin, Grenoble, France — 5Jülich Centre f. Neutron Science — 6Laboratoire Léon Brillouin, Saclay, France
We report recent experiments on Li2CuO2 single crystals. The magnetic phase diagram we have derived from magnetization, specific heat, thermal expansion and magnetostriction data is discussed in view of a new detailed inelastic neutron scattering study [1]. Li2CuO2 represents a simple, strongly frustrated spin chain material close to the 3D ferromagnetic (FM)-helical critical point. At low temperatures weak antiferromagnetic inter-chain exchange interactions are found to cause FM in-chain ordering. Above the ground state low-lying helical excitations are observed. Implications - esp. of the relatively large nearest neighbor exchange interaction - for the frustrated akin ferromagnetic spin chain compound Ca2Y2Cu5O10 and the helical system Li2ZrCuO4 are pointed out.
[1] W.E.A. Lorenz et al., Europhys. Lett. 88, 37002 (2009).