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Saturation Field of Frustrated Chain Cuprates: Broad Regions of Predominant Interchain Coupling

Nishimoto, S.; Drechsler, S.-L.; Kuzian, R. O.; van den Brink, J.; Richter, J.; Lorenz, W. E. A.; Skourski, Y.; Klingeler, R.; B├╝chner, B.

A thermodynamic method to extract the interchain coupling (IC) of spatially anisotropic 2D or 3D spin-1/2 systems from their empirical saturation field Hs(T = 0) is proposed. Using modern theoretical methods we study how Hs is affected by an antiferromagnetic (AFM) IC between frustrated chains described in the J1-J2-spin model with ferromagnetic 1st and AFM 2nd neighbor in-chain exchange. A complex 3D-phase diagram has been found. For Li2CuO2 and Ca2Y2Cu5O10, we show that Hs is solely determined by the IC and predict Hs \apprx 61 T for the latter. With Hs \approx 55 T from magnetization data one reads out a weak IC for Li2CuO2 close to that obtained from inelastic neutron scattering.

  • Physical Review Letters 107(2011), 097201

Permalink: https://www.hzdr.de/publications/Publ-16177
Publ.-Id: 16177