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Magnetization step of isolated Co2+ions in hexagonal Cd1− xCoxS and Cd1− xCoxSe

Authors
Journal
Solid State Communications
0038-1098
Publisher
Elsevier
Publication Date
Volume
87
Issue
9
Identifiers
DOI: 10.1016/0038-1098(93)90408-f

Abstract

Abstract In Cd 1− x Co x S and Cd 1− x Co x Se, each isolated Co 2+ ion behaves as an effective spin S= 3 2 . The axial anisotropy results in two Kramers doublets: the lower with S z = ±1 2 , and the higher with S z = ±3 2 . In a magnetic field H along the c-axis, a level crossing at a field H c leads to a change of the ground state from S z = -1 2 to S z = -3 2 . As a consequence, at the field H c a large magnetization step (MST) occurs if the temperature is sufficiently low. This MST, arising from isolated Co 2+ ions in an axial anisotropy, was observed near 30 mK. A new force magnetometer operating in a plastic dilution refrigerator was used.

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