J. D. Axe
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View article: Single crystal diffraction
Single crystal diffraction Open
Crystallographic techniques are used in many scientific fields, and, at first instance, all applications appear to use the same theory and instrumentation. However a closer look at the requirements posed by the different fields reveals tha…
View article: From double exchange to superexchange in charge ordering perovskite manganites
From double exchange to superexchange in charge ordering perovskite manganites Open
The authors found dynamic ferromagnetic correlations at the room temperature in perovskite manganites which have an antiferromagnetic insulating ground state. They are replaced by antiferromagnetic correlations when the electrons order. Th…
View article: Lattice instability in single-crystal La/sub 2-x/Sr/sub x/CuO/sub 4/
Lattice instability in single-crystal La/sub 2-x/Sr/sub x/CuO/sub 4/ Open
The structural phase transition from the tetragonal to the orthorhombic phase of doped and undoped samples of La/sub 2-x/Sr/sub x/CuO/sub 4/ has been investigated by using inelastic neutron scattering techniques. The rotational nature of t…
View article: Structural phase transformations and high-T/sub c/ superconductivity
Structural phase transformations and high-T/sub c/ superconductivity Open
This report presents a brief discussion of the connection between high T/sub c/ superconductivity and crystal structure instability. High resolution synchrotron x-ray powder diffraction measurements have been performed on the superconducto…
View article: Fluctuations and freezing in a one-dimensional liquid: Hg/sub 3-delta/AsF/sub 6/
Fluctuations and freezing in a one-dimensional liquid: Hg/sub 3-delta/AsF/sub 6/ Open
Many papers deal quite properly with systems at their critical dimensionality, d*. In such systems the competing forces between organization and disorder are nearly equally balanced and the analysis of the resulting situation requires some…
View article: Charge density wave instabilities and incommensurate structural phase transformations
Charge density wave instabilities and incommensurate structural phase transformations Open
Incommensurate structural phase transformations involve the appearance of modulated atomic displacements with spatial periodicity unrelated to the fundamental periodicity of the basic lattice. In the case of some quasi one- or two-dimensio…
View article: Studies of the lattice dynamics and phase transitions in 1T--TiSe/sub 2/ and 2H--TaSe/sub 2/
Studies of the lattice dynamics and phase transitions in 1T--TiSe/sub 2/ and 2H--TaSe/sub 2/ Open
Neutron inelastic scattering measurements have been carried out to study the lattice dynamics associated with the 200K phase transition in the layered semimetal IT--TiSe/sub 2/. Dispersion relations for many modes with energies below 20 Me…