A Martensitic Transformation Triggered by Magnetic Ordering: TbCu
Equiatomic rare earth-copper compounds RCu with heavy rare earths have at room temperature a cubic CsCl-type structure (except with Yb), whereas light rare earth compounds have a FeB structure. Anomalous behaviours of the magnetic susceptibility (1) and Knight shift (2) have been observed for GdCu, which were attributed to a structural instability at low temperatures. Morin (3) observed by x-ray investigations a crystallographic transition when a CsCl-type sample of GdCu was cooled below room temperature; annealing at about 700 K was necessary to restore the CsCl-structure. A martensitic transformation has also been detected in YCu below 150 K by resistivity measurements (4).
KeywordsMartensitic Transformation Heavy Rare Earth Knight Shift Phonon Branch Crystal Field Transition
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