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We report preparation, x-ray diffraction, magnetic susceptibility chi(T) andheat capacity Cp(T) measurements on the undoped samples as also samples withZn-doped (S = 0) at Cu site, Ni doped (S = 1) at Cu site, and Ca-doped (holes)at Bi site in the coupled two-leg spin ladder system BiCu2PO6. While, Zn showscomplete solid solubility, Ni could be doped to about 20% and Ca to about 15%.Magnetization and heat capacity data in the undoped compound point towards theexistence of frustration effects. In all the samples, the chi(T) at lowtemperature increases with doping content. The Zn-induced susceptibility issmaller than that due to effective S=1/2 moments possibly due to frustratingnext-nearest-neighbor interactions along the leg. For Zn content x > 0.01,chi(T) deviates from the Curie-law at low temperatures. The magnetic specificheat data Cm(T) for the Zn-doped samples show weak anomalies at low temperaturein agreement with chi(T) behavior. The anomalies are suggestive of spinfreezing at low-T. In contrast, prominent effects are observed in chi(T) andCm(T) on Ni-doped samples. The zero-field-cooled (ZFC) and field-cooled (FC)chi(T) data are different from each other at low temperature unlike that for Zndoped samples, clearly indicating a transition to a spin-glass like phase. Noanomalies were found in Ca- or Pb-doped samples.

Doping effects in the coupled, two-leg spin ladder BiCu2PO6