  Heat-capacity behavior in the presence of externally applied magnetic field
(H) up to 140 kOe is investigated (2-35 K) for the quasi-1-dimensional
compound, Ca3Co2O6, believed to order magnetically with the so-called partially
disordered anti-ferromagnetic structure. The results reveal that there is a
shift of the magnetic transition occurring around 24 K to a marginally higher
temperature (by 0.5 K) as H is increased from 10 to 30 kOe, uncharacteristic of
anti-ferromagnets. No peak attributable to magnetic ordering could be observed
in the entire field range of investigation in the vicinity of the second
magnetic transition, occurring around 10 K. However, hysteresis studies of
H-dependence of C indicate a subtle change in the magnetic structure as the T
is lowered across 10 K.
