Effect of Pressure on the Curie Point of the Pseudo‐NiAs‐Type Cr3Te4

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Abstract
Magnetic induction and electrical resistivity of Cr3□Te4 including vacancies of magnetic atoms have been investigated in the vicinity of the Curie temperatures at hydrostatic pressures up to 6 kbar. The magnetic induction smoothly vanishes at the Curie temperature, Tc = 325 °K. The electrical resistivity shows a I'‐type anomaly with a kink at 319 °K and atmospheric pressure, and this temperature is in agreement with the Curie temperature. The pressure effect on the Curie point has been obtained as: (dTc/dP) = ‐(6.2 ± 0.4) deg/ kbar from the magnetic induction, and (dTc/dP) = ‐(5.9 ± 0.3) deg/kbar from the electrical resistivity measurements. Although a large number of exchange chains are cut by the vacancies in Cr3□Te4, only little difference has been observed in the Curie temperatures between CrTe and Cr3□Te4. This is not explained by a volume effect of exchange integral on the Curie temperature with dTc/dP < 0 in Cr3□Te4, and a brief discussion of exchange interactions in this compound has been done in comparison with those in CrTe on the basis of the ionic model.

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