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A comprehensive study of impurity-induced magnetism in nonmagnetically(Mg${}^{2+}$) and magnetically (Co${}^{2+}$) dopedPbNi${}_{2}$V${}_{2}$O${}_{8}$ compounds is given, using both macroscopic dcsusceptibility and local-probe electron spin resonance (ESR) techniques.Magnetic coupling between impurity-liberated spins is estimated from alinewidth of low-temperature ESR signal in Mg-doped samples. In addition, inthe case of magnetic cobalt dopants the impurity-host magnetic exchange isevaluated from the Co-induced contribution to the linewidth in the paramagneticphase. The experimentally observed severe broadening of the ESR lines in themagnetically doped compounds with respect to nonmagnetic doping is attributedto a rapid spin-lattice relaxation of the Co${}^{2+}$ ions, which results in abottleneck-type of temperature dependence of the induced linewidth. Theexchange parameters obtained from the ESR analysis offer a satisfactoryexplanation of the observed low-temperature magnetization in doped samples.Comment: 8 pages, 6 figure

physical review. b, condensed matter and materials physics

Magnetic interaction between impurity and impurity-liberated spins in the doped Haldane chain compounds<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Pb</mml:mi><mml:msub><mml:mi mathvariant="normal">Ni</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>A</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi mathvariant="normal">V</mml:mi><mml:mn>2</mml:mn></mml:msub><…

Magnetic interaction between impurity and impurity-liberated spins in the doped Haldane chain compoundsPbNi2−xAxV2<…