Frustrated cuprate route from antiferromagnetic to ferromagnetic spin-1/2 Heisenberg chains:: Li2ZrCuO4 as a missing link near the quantum critical point

被引：166
|
作者：
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.
机构：
[1] Leibniz Inst Festkorper & Werkstoffforsch IFW, D-01171 Dresden, Germany
[2] Moscow MV Lomonosov State Univ, Moscow 119992, Russia
[3] RAS, Inst Radiotech & Elect, Moscow 125009, Russia
[4] Univ Magdeburg, Inst Theoret Phys, D-39106 Magdeburg, Germany
[5] Max Planck Inst Chem Phys Fester Stoffe, Dresden, Germany
[6] ASCR, Inst Phys, CZ-18221 Prague 8, Czech Republic
[7] NASU, BI Verkin Inst Low Temp Phys & Engn, UA-61103 Kharkov, Ukraine
来源：
PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 07期
关键词：
D O I：
10.1103/PhysRevLett.98.077202
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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 c(p)(T,H) within a Heisenberg model, we show that the ratio of the 2nd to the 1st neighbor exchange integrals alpha=-J(2)/J(1)similar to 0.3 is close to the critical value alpha(c)=1/4. Comparing with related chain cuprates we explain the rather strong field dependence of c(p), the monotonic downshift of the peak of chi(T), and its increase for alpha ->alpha(c)+0.
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页数：4
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