Paramagnetic and antiferromagnetic resonances in the diamagnetically diluted Haldane magnet PbNi2V2O8

Abstract

The impurity-induced antiferromagnetic ordering of the doped Haldane magnet Pb(Ni{1-x}Mg{x})2V2O8 (0 < x <0.06) was studied by electron spin resonance (ESR) on ceramic samples in the frequency range 9-110 GHz. Below the Néel temperature a transformation of the ESR spectrum was found, indicating an antiferromagnetic resonance mode of spin precession. The excitation gap of the spin-wave spectrum increases with increasing Mg-concentration $x$ in the same manner as the Néel temperature, reaching its maximum value of 80 GHz at x > 0.04. At small concentrations x < 0.02 the signals of antiferromagnetic resonance were found to coexist with the signal of the paramagnetic resonance indicating a microscopic separation of the magnetic phases.

10 pages, 9 figures

References in corpus (3)

• Site-Dilution-Induced Antiferromagnetic Long-Range Order in Two-Dimensional Spin-Gapped Heisenberg Antiferromagnet
• Separation of the magnetic phases at the Néel point in the diluted spin-Peierls magnet CuGeO3
• Magnetic Resonance of Spin Clusters and Triplet Excitations in a Spin-Peierls Magnet with Impurities

Cited by in corpus (9)

• Spin-resonance modes of the spin-gap magnet TlCuCl_3
• Field-induced magnetic ordering in the Haldane system PbNi2V2O8
• Triplet spin resonance of the Haldane compound with interchain coupling
• Low-energy magnetic excitations in the quasi-one-dimensional spin-1 chain compound SrNi2V2O8
• Magnetic properties of the spin-1 chain compound NiCl${}_3$C${}_6$H${}_5$CH${}_2$CH${}_2$NH${}_3$
• ESR investigation of the spin dynamics in (Gd_{1-x}Y_{x})_2PdSi_{3}
• Field-controlled phase separation at the impurity-induced magnetic ordering in the spin-Peierls magnet CuGeO3
• Formation of the S=1 paramagnetic centers in the bond-diluted spin-gap magnet
• Chain Formation by Spin Pentamers in eta-Na9V14O35