Abstract
Based on low-field magnetization measurements on a series of single crystals, we present a scheme of the Eu spin alignment in EuFe(AsP). We explain observations of the Eu ordering previously reported, reconciling different existing phase diagrams. The magnetic moments of the Eu ions are slightly canted, yielding a ferromagnetic contribution along the direction that becomes stronger with pressure, until superconductivity sets in. The spin-density wave as well as the superconducting phase coexist with an antiferromagnetic interlayer coupling of the canted spins. Reducing the interlayer distance finally leads to a ferromagnetic Eu interlayer coupling and to the suppression of superconductivity.
- Received 11 March 2011
DOI:https://doi.org/10.1103/PhysRevB.84.140503
©2011 American Physical Society