Specific heat investigation of the magnetic ordering in two frustrated spin-chain oxides: Ca3Co2O6 and Ca3CoRhO6
V. Hardy, M. R. Lees, A. Maignan, S. Hebert, D. Flahaut, C. Martin and, D. McK. Paul
TL;DR
This study investigates the specific heat and magnetic ordering in two frustrated spin-chain oxides, Ca3Co2O6 and Ca3CoRhO6, revealing similarities in low-temperature spin freezing and differences in high-temperature interchain antiferromagnetic order.
Contribution
It provides new specific heat data on Ca3Co2O6 and Ca3CoRhO6, elucidating their magnetic frustration and ordering behaviors in relation to previous magnetization and neutron studies.
Findings
Similar spin-freezing processes at low temperatures
Differences in antiferromagnetic interchain ordering at higher temperatures
Connection with previous magnetization and neutron diffraction results
Abstract
Specific heat measurements were carried out on the closely related spin-chain oxides Ca3Co2O6 and Ca3CoRhO6. Both compounds consist of Ising magnetic chains that are arranged on a triangular lattice. The spin coupling along and between the chains are ferromagnetic and antiferromagnetic, respectively. Geometrical frustration is expected from the combination of these magnetic features. The present study reports that the specific heat data of these compounds exhibit similarities in the spin-freezing process at low T, whereas striking differences exist in the antiferromagnetic interchain ordering at higher T. These results are discussed in connection with previous magnetization and neutron diffraction data.
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