科研之友
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摘要
In Dy(As0.15V0.85)O-4, a structural example of a random-field Ising system, As/V substitutions depress the tetragonal-orthorhombic transition temperature and roughen the interfaces between twinned domains. The transverse broadening of diffraction peaks due to interfacial roughening in the orthorhombic phase has been studied by high-resolution neutron scattering. The observed broadening is interpreted with the use of a simple random-walk model that gives a value of 0.11 mu m for the roughness parameter of the domain walls. Just above the transition temperature, a broad peak is visible whose width indicates short-range orthorhombic ordering with a similar length scale. Application of an ordering field shows that the interfaces become smoother as they are driven together, and are less rough than originally, when they reform after removal of the field.
- 出版日期1995-9-1
