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| VOLUME 46 (1987) | ISSUE 1 |
PAGE 42
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New type of superstructures at the (100) surface of a cubic Heisenberg antiferromagnet EuTe
Grazhulis V. A. , Ionov A. M. , Kuleshov V. F.
The formation of a superstructure (ÔäèÔä)ë — 45°, which is incompatible with the bulk spin structure, has been observed experimentally for the first time on a clean (100) surface of a cubic antiferromagnetic semiconductor EuTe at TS TN ~ 9.6 K. The formation of this superstructure upon going through TN from the high-temperature side occurs through the formation of an "intermediate" modulated superstructure which undergoes a transition to (^2 X y/2 )R — 45° upon lowering the temperature. The wave vector Ë of a modulated superstructure changes reversibly as Τ is varied from the center, Ë = 0, to the edge of the square two-dimensional Brillouin zone, always remaining oriented along its diagonal.
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![](/ps/1224/article_18499_800_head.png "The formation of a superstructure <b><i>(ÔäèÔä</i></b><i>)ë — </i>45°, which is incompatible with the bulk spin structure, has been observed experimentally for the first time on a clean (100) surface of a cubic antiferromagnetic semiconductor EuTe at <i>TS T<sub>N</sub> </i>~ 9.6 K. The formation of this superstructure upon going through <i>T<sub>N</sub> </i>from the high-temperature side occurs through the formation of an "intermediate" modulated superstructure which undergoes a transition to (^2 X <b><i>y</i></b><i>/2 )R </i><b>— </b>45° upon lowering the temperature. The wave vector Ë of a modulated superstructure changes reversibly as <i>Τ is </i>varied from the center, Ë = 0, to the edge of the square two-dimensional Brillouin zone, always remaining oriented along its diagonal.")