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The route of frustrated cuprates from antiferromagnetic to ferromagnetic spin-1/2 Heisenberg chains: Li2ZrCuO4 as a missing link near the quantum critical point by Drechsler, S. -L.; Volkova, O.; Vasiliev, A. N.; Tristan, N.; Richter, J.; Schmitt, M.; Rosner, H.; Malek, J.; Klingeler, R.; Zvyagin, A. A.; Buechner, B. is a scholarly article available to read on EtoBox.

What is The route of frustrated cuprates from antiferromagnetic to ferromagnetic spin-1/2 Heisenberg chains: Li2ZrCuO4 as a missing link near the quantum critical point about?

From thermodynamics, LSDA+U calculations and exact diagonalization studies of a five-band Hubbard (Cu 3d, O 2p) model on CuO2 stripes we found that Li2ZrCuO4 (Li2CuZrO4 in traditional notation) is close to a ferromagnetic critical point. Analyzing its measured susceptibility chi(T) and specific heat cp(T,H) within a Heisenberg model, we show that the ratio of the 2nd to the 1st neighbor exchange integrals alpha=-J2/J1 of the order of 0.3, i.e. it is close to the critical value alpha_c=1/4. Comparing with related chain cuprates we explain the rather strong field dependence of cp, the monotonous down shift of the peak of chi(T), and its increase for alpha approaching 1/4 + 0.

Author

Drechsler, S. -L.; Volkova, O.; Vasiliev, A. N.; Tristan, N.; Richter, J.; Schmitt, M.; Rosner, H.; Malek, J.; Klingeler, R.; Zvyagin, A. A.; Buechner, B.

Published

2007

Language

EN