Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1997-05-05
Physics
Condensed Matter
Strongly Correlated Electrons
9 pages, REVTEX, 5 figures
Scientific paper
10.1103/PhysRevB.57.1102
Experimental data for the magnetic susceptibility and magnetostriction of CuGeO_3 are analyzed within a one-dimensional antiferromagnetic model with nearest ({J_1}) and next-nearest neighbour interactions ({J_2}). We show that the ratio of the exchange constants in the antiferromagnetic chains of CuGeO_3 amounts to ${J_2}/{J_1}$ = 0.354(0.01), i.e. it is significantly larger than the critical value for the formation of a spontaneous gap in the magnetic excitation spectrum without lattice dimerization. The susceptibility data are reproduced by our numerical results over the temperature range from 20K to 950K to a high degree of accuracy for ${J_1} = 80.2 (3.0)$ and ${J_2} = 28.4 (1.8)$. The pressure dependence of the exchange constants is estimated from magnetostriction data. Furthermore, the specific heat data are checked on consistency against the calculated entropy of the above model.
Büchner Bernd
Fabricius Klaus
Klümper Andreas
Lorenz Thomas
Löw Ute
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