Evidence of two-dimensional clusters as precursors of an instability in BaZnF4
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Evidence of two-dimensional clusters as precursors of an instability in BaZnF4. / Almairac, R.; Bordallo, H. N.; Bulou, A.; Nouet, J.
In: Physical Review B, Vol. 52, No. 13, 01.01.1995, p. 9370-9376.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Evidence of two-dimensional clusters as precursors of an instability in BaZnF4
AU - Almairac, R.
AU - Bordallo, H. N.
AU - Bulou, A.
AU - Nouet, J.
PY - 1995/1/1
Y1 - 1995/1/1
N2 - Diffuse scattering in BaZnF4 is investigated by an x-ray method in the temperature range 410 10 K. Rodlike diffuse intensities are observed at room temperature. They indicate the occurrence of some (2a,2c) ordering in the (a,c) planes which are the planes of linked ZnF6 octahedra. Complete disorder takes place from plane to plane along the b direction. Based on x-ray and Raman data an interpretation of the diffuse streaks by two-dimensional dynamical clusters is given. It corresponds to a slow dynamics (<10 cm-1). It is shown that these clusters can be viewed as precursors of an instability of the same type as the instability giving rise to the incommensurate phase in BaMnF4.
AB - Diffuse scattering in BaZnF4 is investigated by an x-ray method in the temperature range 410 10 K. Rodlike diffuse intensities are observed at room temperature. They indicate the occurrence of some (2a,2c) ordering in the (a,c) planes which are the planes of linked ZnF6 octahedra. Complete disorder takes place from plane to plane along the b direction. Based on x-ray and Raman data an interpretation of the diffuse streaks by two-dimensional dynamical clusters is given. It corresponds to a slow dynamics (<10 cm-1). It is shown that these clusters can be viewed as precursors of an instability of the same type as the instability giving rise to the incommensurate phase in BaMnF4.
UR - http://www.scopus.com/inward/record.url?scp=0642296658&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.52.9370
DO - 10.1103/PhysRevB.52.9370
M3 - Journal article
AN - SCOPUS:0642296658
VL - 52
SP - 9370
EP - 9376
JO - Physical Review B
JF - Physical Review B
SN - 2469-9950
IS - 13
ER -
ID: 218270169