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Saturation field of frustrated chain cuprates: broad regions of predominant interchain coupling

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arxiv 1004.3300 v3 pith:TS3SMYWU submitted 2010-04-19 cond-mat.str-el

S. Nishimoto , S.-L. Drechsler , R.O. Kuzian , J. van den Brink , J. Richter , W.E.A. Lorenz , Y. Skourski , R. Klingeler
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B. Buechner
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classification cond-mat.str-el
keywords approxcouplingfieldfrustratedinterchainli2cuo2saturationaffected
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An efficient and precise thermodynamic method to extract the interchain coupling (IC) of spatially anisotropic 2D or 3D spin-1/2 systems from their empirical saturation field H_s (T=0) is proposed. Using density-matrix renormalization group, hard-core boson, and spin-wave theory we study how H_s is affected by an antiferromagnetic (AFM) IC between frustrated chains described in the J_1-J_2-spin model with ferromagnetic 1st and AFM 2nd neighbor in-chain exchange. A complex 3D-phase diagram has been found. For Li2CuO2 and Y2Ca2Cu5O10, we show that H_s is solely determined by the IC and predict H_s approx 61 T for the latter.Using H_s approx 55 T from our high-field pulsed measurements one reads out a weak IC for Li2CuO2 close to that from neutron scattering.

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