Abstract
Measurements of magnetization and muon spin relaxation (μSR) have been carried out for the sample of Ca3 (Co1−xZnx)2O6 with a frustrated antiferromagnetic triangular lattice consisting of Ising ferromagnetic chains for the purpose of the investigation of Zn‐substitution effect on the frustrated system. The magnetic ordering temperature Tc1 determined from magnetization data is 22 K for x = 0.03, which is 3 K lower than that of the un‐doped sample. This implies the reduction of an inter‐chain interaction due to Zn‐substitution, In the μSR measurement in longitudinal fields, static magnetic order could not be observed even at 18 K below Tc1. By Zn‐substitution up to 3% in Ca3Co2O6, the magnetic frustration is not removed but rather enhanced due to the reduction of the exchange interaction in nearest and next nearest neighbors.
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