Abstract
We have investigated the nuclear and magnetic diffraction of neutrons from powder and single-crystal samples of KCu at temperatures between 298 and 4.4°K, in order to establish the magnetic structure, and, in particular, to try to determine whether there exist any long-range one-dimensional correlations in this material. Previous work has shown that KCu has two stable polytype tetragonal structures which may coexist over a large range of temperatures. The samples used in this work indicated the simultaneous presence of both these structures, and gave diffraction peaks indicative of and space groups. Both structures are found to have type- magnetic ordering with the spins lying in the plane. Our results suggest that the structure orders at 38±1°K, while the may order at 22±4°K. The moment of the ion is determined to be . No direct evidence for one-dimensional order above 38°K nor for long-range one-dimensional correlations has been found, but their presence has not been unambiguously ruled out.
- Received 25 June 1969
DOI:https://doi.org/10.1103/PhysRev.188.919
©1969 American Physical Society