Effect of cobalt doping on the magnetic properties of the spin-Peierls cuprate CuGeO3
P. E. Anderson, J. Z. Liu, R. N. Shelton
DOI 10.1103/PhysRevB.56.11014 · Physical Review B
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Abstract
The magnetization of single crystals in the system (Cu1−xCox)GeO3 has been measured for compositions in the range 0.000<~x<~0.0547. These crystals exhibit paramagnetic behavior, which has been fit with a Curie-Weiss expression to determine the effective moment (μeff) along the three principle crystal directions. For x<~0.0225, the spin-Peierls transition is apparent in the magnetization data, with the transition temperature (Tsp) decreasing with increased cobalt doping. For x>~0.0204, an anisotropic magnetic transition occurs below 6 K, and is attributed to three-dimensional long-range antiferromagnetic ordering. When the field is directed along the c axis, spin-flop behavior is observed at a critical field [Hc(x,T)] for temperatures less than the Néel temperature (TN). Due to the strong paramagnetism in this system, TN and Tsp as a function of cobalt concentration were measured with single-crystal microcalorimetry. The effects of cobalt doping are discussed with respect to recent reports of Zn, Si, and Ni doping.
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