Theoretical analysis of the reduction of Néel temperature in La2(Cu1-xZn(orMg)x)O4

  title={Theoretical analysis of the reduction of N{\'e}el temperature in La2(Cu1-xZn(orMg)x)O4},
  author={Takuya Edagawa and Yoshiyuki Fukumoto and Akihide Oguchi},
  journal={Journal of Magnetism and Magnetic Materials},
Abstract Using Tyablikov's decoupling approximation, we calculate the initial suppression rate of the Neel temperature, R IS = - lim x → 0 T N - 1 d T N / d x , in a quasi two-dimensional diluted Heisenberg antiferromagnet with nonmagnetic impurities of concentration x . In order to explain an experimental fact that R IS ( Zn ) = 3.4 of the Zn-substitution is different from R IS ( Mg ) = 3.0 of the Mg-substitution, we propose a model in which impurity substitution reduces the intra-plane… Expand
1 Citations

Figures from this paper

Impurity induced interactions in diluted La2CuO4
A non-magnetic impurity, such as Zn, doped into a non-frustrated antiferromagnet can induce substantial frustrating interactions among the spins surrounding it and result in an enhanced suppressionExpand


Magnetic dilution study in La2CuO4: Comparison with other two-dimensional magnets.
PHYSICAL REVIEW B VOLUME 44, NUMBER 17 Magnetic dilution study in La2Cu04. Comparison with other two-dimensional NOVEMBER 1991-I magnets S-W. Cheong, A. S. Cooper, L. W. Rupp, Jr. , and B. BatloggExpand
Diluted quantum antiferromagnets: Spin excitations and long-range order
We have studied the static and dynamic magnetic properties of two-dimensional (2D) and quasi-two-dimensional, spin-S, quantum Heisenberg antiferromagnets diluted with spinless vacancies. UsingExpand
Site dilution of quantum spins in the honeycomb lattice
We consider the effect of random site dilution on a honeycomb lattice of quantum spins described by the antiferromagnetic Heisenberg spin-$S$ model. Using linear spin-wave theory, we compute theExpand
Critical temperature of randomly diluted Heisenberg spin systems with anisotropic exchange couplings
The value of (1/Tc)(dTc/dx) mod x=1, where x is the magnetic site (bond) concentration, is calculated for randomly site-(bond-) diluted Heisenberg spin systems within a random phase approximationExpand
Spin waves and electronic interactions in La2CuO4.
The observed dispersion relation shows evidence for substantial interactions beyond the nearest-neighbor Heisenberg term which can be understood in terms of a cyclic or ring exchange due to the strong hybridization path around the Cu4O4 square plaquettes. Expand
Excitations and quantum fluctuations in site-diluted two-dimensional antiferromagnets
We study the effect of site dilution and quantum fluctuations in an antiferromagnetic spin system on a square lattice within the linear spin-wave approximation. By performing numericalExpand
Quantum phase transition of the randomly diluted heisenberg antiferromagnet on a square lattice
Ground-state magnetic properties of the diluted Heisenberg antiferromagnet on a square lattice are investigated by means of the quantum Monte Carlo method with the continuous-time loop algorithm. ItExpand
Two-step restoration of SU(2) symmetry in a frustrated ring-exchange magnet.
We demonstrate the existence of a spin-nematic, moment-free phase in a quantum four-spin ring-exchange model on the square lattice. This unusual quantum state is created by the interplay ofExpand
Phys. Rev
  • Phys. Rev
  • 2006
Phys. Rev. Lett
  • Phys. Rev. Lett
  • 2005