Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
1999-03-09
Physics
Condensed Matter
Disordered Systems and Neural Networks
Final version accepted for publication as a Rapid Communication on Physical Review B. A new discussion on the effect of disord
Scientific paper
10.1103/PhysRevB.61.R3772
We propose an effective two-dimensional quantum non-linear sigma model combined with classical percolation theory to study the magnetic properties of site diluted layered quantum antiferromagnets like La$_{2}$Cu$_{1-x}$M$_x$O$_{4}$ (M$=$Zn, Mg). We calculate the staggered magnetization at zero temperature, $M_s(x)$, the magnetic correlation length, $\xi(x,T)$, the NMR relaxation rate, $1/T_1(x,T)$, and the N\'eel temperature, $T_N(x)$, in the renormalized classical regime. Due to quantum fluctuations we find a quantum critical point (QCP) at $x_c \approx 0.305$ at lower doping than the two-dimensional percolation threshold $x_p \approx 0.41$. We compare our results with the available experimental data.
Castro Neto Antonio H.
Chen Ya-Chen
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