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20 April 2024

» pubmed » pmid17359054

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Frustrated cuprate route from antiferromagnetic to ferromagnetic spin-1/2 Heisenberg chains: Li2ZrCuO4 as a missing link near the quantum critical point
S-L Drechsler ; O Volkova ; A N Vasiliev ; N Tristan ; J Richter ; M Schmitt ; H Rosner ; J Málek ; R Klingeler ; A A Zvyagin ; B Büchner ;
Date:	16 Feb 2007
Journal:	Phys Rev Lett, 98 (7), 077202
Abstract:	From thermodynamics, local spin density approximation+Hubbard U studies and exact diagonalizations of a five-band Hubbard model on CuO2 stripes we find that Li2ZrCuO4 (Li2CuZrO4 in traditional notation) is close to a ferromagnetic critical point. Analyzing its 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 approximately 0.3 is close to the critical value alphac=1/4. Comparing with related chain cuprates we explain the rather strong field dependence of cp, the monotonic downshift of the peak of chi(T), and its increase for alpha-->alphac+0.
Source:	PubMed, pmid17359054
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