Abstract
The compound is not superconducting and exhibits antiferromagnetic ordering of the Pr moments with Néel temperature of ∼17 K. We have carried out magnetic, heat-capacity, and neutron-diffraction structural studies on Zn- and Ga-substituted . The Zn and Ga dopants presumably substitute at the plane and the chain Cu sites, respectively. Our measurements reveal that is reduced in both cases; the reduction being faster for Ga substitution than for Zn substitution. For 10 at. % Zn substitution is ∼15–16 K, while for the same substitution level of Ga it is ∼12–14 K. It is rather unusual that the plane-site substitution has relatively less effect on than the chain-site substitution. From neutron-diffraction studies the cause of such contrasting behavior may be understood in terms of changed planar Cu- and Pr- bond lengths. The electronic specific-heat coefficient γ of the substituted samples is found to be large as in the parent compound.
- Received 8 June 1995
DOI:https://doi.org/10.1103/PhysRevB.52.13006
©1995 American Physical Society