TbB6 antiferromagnetic state: a macroscopic and microscopic investigation (CROSBI ID 167282)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Amara, Mehdi ; Galera, Rose-Marie ; Aviani, Ivica ; Givord, Françoise.
engleski
TbB6 antiferromagnetic state: a macroscopic and microscopic investigation
The antiferromagnetic state of TbB6 has been investigated by means of magnetic susceptibility, magnetostriction and X-ray diffraction measurements on a single crystal. The anisotropy of the magnetic susceptibility and the magnetostriction data point to a tetragonal symmetry in the antiferromagnetic state. Below TN, the X-ray diffraction investigation shows charge satellites, related to the <1/2 0 0> and h <1/2 1/2 0> wave vectors stars, similar to those observed in GdB6. The <1/2 0 0> satellites clearly result from the formation of static atomic displacements waves. The displacive phenomenon is described as a compromise between the exchange coupling and a single-ion elastic energy. This mechanism is shown to be responsible for the recurrence of the h <1/4 1/4 1/2> i magnetic wave vectors in rare-earth hexaborides. A combined analysis of experimental and theoretical data points to only two stable tetragonal models for TbB6 antiferromagnetic structure. This study confirms the influence of exchange displacements in rare-earth hexaborides and highlights the need for a systematic investigation of the magnetic anisotropy of antiferromagnets
antiferromagnetism; domains; displacement waves; rare-earth hexaborides; magnetostriction; Xray
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Podaci o izdanju
82
2010.
224411-1-224411-13
objavljeno
1098-0121
10.1103/PhysRevB.82.224411
Povezanost rada
Fizika