Evidence for impurity-induced frustration in La2CuO4

Abstract

Zero-field muon spin rotation and magnetization measurements were performed in La2Cu{1-x}MxO4, for 0<x< 0.12, where Cu2+ is replaced either by M=Zn2+ or by M=Mg2+ spinless impurity. It is shown that while the doping dependence of the sublattice magnetization (M(x)) is nearly the same for both compounds, the Néel temperature (T_N(x)) decreases unambiguously more rapidly in the Zn-doped compound. This difference, not taken into account within a simple dilution model, is associated with the frustration induced by the Zn2+ impurity onto the Cu2+ antiferromagnetic lattice. In fact, from T_N(x) and M(x) the spin stiffness is derived and found to be reduced by Zn doping more significantly than expected within a dilution model. The effect of the structural modifications induced by doping on the exchange coupling is also discussed.

4 pages, 4 figures

References in corpus (4)

• The spin-1/2 J1-J2 Heisenberg antiferromagnet on the square lattice: Exact diagonalization for N=40 spins
• Impurity-induced frustration in correlated oxides
• Site Dilution in the Half-Filled One-Band Hubbard Model: Ring Exchange, Charge Fluctuations and Application to La2Cu_{1-x}(Mg/Zn)_xO4
• Theoretical Analysis of the Reduction of Neel Temperature in La${}_2$(Cu${}_{1-x}$Zn(or Mg)${}_x)$O${}_4$

Cited by in corpus (10)

• Antiferromagnetism of Zn${}_2$VO(PO${}_4{)}_2$ and the dilution with Ti${}^{4+}$
• Magnetic phase diagram of low-doped La{2-x}SrxCuO4 thin films studied by low-energy muon-spin rotation
• Square-lattice magnetism of diaboleite Pb2Cu(OH)4Cl2
• Low-dimensional magnetism of BaCuTe${}_2$O${}_6$
• Criticality and Mott-glass phase in a disordered 2D quantum spin systems
• Antiferromagnetism beyond classical percolation threshold in the site-diluted half-filled one-band Hubbard model in three dimensions
• Impurity-induced frustration: low-energy model of diluted oxides
• Validity of Harris criterion for two-dimensional quantum spin systems with quenched disorder
• Singling out the effect of quenched disorder in the phase diagram of cuprates
• Magnetic properties of LiCu${}_3$O${}_3$ -- quasi-two-dimensional antiferromagnet on depleted square lattice