TY - JOUR
T1 - Diffuse X-Ray scattering study of lead magnesium niobate single crystals
AU - You, H.
AU - Zhang, Q. M.
PY - 1997
Y1 - 1997
N2 - Single crystals of lead magnesium niobate, PbMg1/3Nb2/3O3, were studied with x-ray scattering measurements at temperatures between 10 and 350 K. The diffuse scattering around odd-integer Bragg reflections (H + K + L = odd) has a significant anisotropic component with ledges along (110) directions. We show that the transverse optic (ferro distortion) modes whose polarizations are along (110) directions are soft and responsible for the observed diffuse scattering. Upon cooling, these modes undergo a freezing process with q-dependent freezing temperatures. Below the lowest freezing temperature (T ≲ 190K) the diffuse scattering follows 1/q2 law, indicating an elastically distorted, static structure.
AB - Single crystals of lead magnesium niobate, PbMg1/3Nb2/3O3, were studied with x-ray scattering measurements at temperatures between 10 and 350 K. The diffuse scattering around odd-integer Bragg reflections (H + K + L = odd) has a significant anisotropic component with ledges along (110) directions. We show that the transverse optic (ferro distortion) modes whose polarizations are along (110) directions are soft and responsible for the observed diffuse scattering. Upon cooling, these modes undergo a freezing process with q-dependent freezing temperatures. Below the lowest freezing temperature (T ≲ 190K) the diffuse scattering follows 1/q2 law, indicating an elastically distorted, static structure.
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U2 - 10.1103/PhysRevLett.79.3950
DO - 10.1103/PhysRevLett.79.3950
M3 - Article
AN - SCOPUS:0000261409
SN - 0031-9007
VL - 79
SP - 3950
EP - 3953
JO - Physical review letters
JF - Physical review letters
IS - 20
ER -