Observation of a novel ferromagnetic phase of Ho<sup>3+</sup> in Ho/Lu superlattices
P P Swaddling; D F McMorrow; J A Simpson; M R Wells; R C C Ward; K N Clausen; P P Swaddling; Clarendon Lab., Oxford Univ., UK; D F McMorrow; Clarendon Lab., Oxford Univ., UK; J A Simpson; Clarendon Lab., Oxford Univ., UK; M R Wells; Clarendon Lab., Oxford Univ., UK; R C C Ward; Clarendon Lab., Oxford Univ., UK; K N Clausen; Clarendon Lab., Oxford Univ., UK
Журнал:
Journal of Physics: Condensed Matter
Дата:
1993-09-27
Аннотация:
The magnetic structures of three Ho/Lu superlattices have been investigated using neutron diffraction. The low-temperature magnetic structure adopted by the Ho<sup>3+</sup> moments is found to depend on the number n<sub>Ho</sub> of atomic planes in a single block of Ho. For a sample with n<sub>H0</sub> approximately=40 the moments form a basal-plane spiral down to the lowest temperatures investigated, whereas for two samples with n<sub>Ho</sub><or=20 a phase transition occurs from a basal-plane spiral to a structure in which the Ho<sup>3+</sup> moments within a single block align ferromagnetically.
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