Finite-size effects in the quasi-one-dimensional quantum magnets Sr${}_2$CuO${}_3$, Sr${}_2$Cu${}_{0.99}$M${}_{0.01}$O${}_3$ (M = Ni, Zn), and SrCuO${}_2$

Abstract

We studied the finite-size effects on the magnetic behavior of the quasi-one-dimensional spin S = $\frac{1}{2}$ Heisenberg antiferromagnets Sr${}_2$CuO${}_3$, Sr${}_2$Cu${}_{0.99}$M${}_{0.01}$O${}_3$ (M = Zn and Ni), and SrCuO${}_2$. Magnetic susceptibility data were analyzed to estimate the concentration of chain-breaks due to extrinsically doped defects and/or due to slight oxygen off-stoichiometry. We show that the susceptibility of Sr${}_2$Cu${}_{0.99}$Ni${}_{0.01}$O${}_3$ can be described by considering Ni${}^{2+}$ as a scalar defect ($S_{eff}=0$) indicating that the Ni spin is screened. In Sr${}_2$Cu${}_{0.99}$Zn${}_{0.01}$O${}_3$ susceptibility analysis yields a defect concentration smaller than the nominal value which is in good qualitative agreement with crystal growth experiments. Influence of doping on the low-temperature long-range spin ordered state is studied. In the compound SrCuO${}_2$, consisting of zigzag S = $\frac{1}{2}$ chains, the influence of spin frustration on the magnetic ordering and the defect concentration determined from the susceptibility data is discussed.

arXiv comment11 pages, 10 figures and 3 tables

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Cited by in corpus (10)

• Open XXZ chain and boundary modes at zero temperature
• Impurities in weakly coupled quantum spin chains Sr${}_2$CuO${}_3$ and SrCuO${}_2$
• Spin pseudogap in the $S=\frac{1}{2}$ chain material Sr${}_2$CuO${}_3$ with impurities
• The effect of different in-chain impurities on the magnetic properties of the spin chain compound SrCuO${}_2$ probed by NMR
• The dynamic structure factor in impurity-doped spin chains
• Effects of quantum impurity spins on the magnetic properties of zigzag and linear spin chains
• Quantum critical dynamics and scaling in one-dimensional antiferromagnets
• Magnetic ordering in the ultra-pure site-diluted spin chain materials SrCu${}_{1-x}$Ni${}_x$O${}_2$
• Suppression of the impurity-induced local magnetism by the opening of a spin pseudogap in Ni-doped Sr${}_2$CuO${}_3$
• Giant orbital polarization of Ni${}^{2+}$ in square planar environment