Abstract
The interplay between fluctuations of the local structure and magnetic interactions is of great importance for phenomena like superconductivity, colossal magnetoresistance, and frustrated magnetism...
Highlights
Nanoscale heterogeneities, structural variations, and broken symmetry states play a ubiquitous role in emergent properties such as colossal magnetoresistance,[1] frustrated magnetism,[2,3] pseudogaps,[4] and high-temperature superconductivity.[5,6] The properties of these types of complex materials depend critically on local deviations from the long-range average structure
The powder X-ray diffraction (PXRD) clearly shows that the atomic structural phase transition (ASPT) occurs over a temperature range of some 200 K, where a gradual transition from the orthorhombic structure to the hexagonal structure occurs
When exploring a solid solution, as currently exemplified by the pseudobinary MnAs1−xPx phase, one will synthetically normally strive for maximum homogeneity at all length scales and thereby be able to fully study in detail how the physicochemical properties vary with parameters like the average electronegativity, electron concentration, chemical pressure, charge states, and more
Summary
Structural variations, and broken symmetry states play a ubiquitous role in emergent properties such as colossal magnetoresistance,[1] frustrated magnetism,[2,3] pseudogaps,[4] and high-temperature superconductivity.[5,6] The properties of these types of complex materials depend critically on local deviations from the long-range average structure. During a magnetic ordering transition (MT), the local change in magnetic interactions might influence the local atomic structure without entering into the situation of a simultaneous atomic structural phase transition (ASPT). The average Mn spin state appears to be very dependent on bond distances (unit cell volume; distortions) This makes it possible to explore how distortions in the local symmetry owing to quite different Mn−As and Mn−P bond distances affect the magnetism and structure. We address this challenging issue by means of a total scattering analysis of MnAs1−xPx and correlate the findings with magnetic susceptibility data. ■Mn−P (blue) and Mn−As (red) bond distances as a function of P substitution for MnAs1−xPx
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