We report the first observation of long-range order in a semiconductor III-V ternary alloy. thin crystals grown by metal-organic chemical vapor deposition or molecular-beam epitaxy have Ga atoms preferentially occupying the 0,0,0 and ½,½,0 sites and Al atoms the ½,0,½ and 0,½,½ sites in each unit cell. Our results indicate that this ordered structure is the equilibrium state of .
- Received 29 October 1984
©1985 American Physical Society