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Varying Eu2+ magnetic order by chemical pressure in EuFe2(As1xPx)2

S. Zapf, D. Wu, L. Bogani, H. S. Jeevan, P. Gegenwart, and M. Dressel
Phys. Rev. B 84, 140503(R) – Published 13 October 2011

Abstract

Based on low-field magnetization measurements on a series of single crystals, we present a scheme of the Eu2+ spin alignment in EuFe2(As1xPx)2. We explain observations of the Eu2+ ordering previously reported, reconciling different existing phase diagrams. The magnetic moments of the Eu2+ ions are slightly canted, yielding a ferromagnetic contribution along the c 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 Eu2+ interlayer coupling and to the suppression of superconductivity.

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  • Received 11 March 2011

DOI:https://doi.org/10.1103/PhysRevB.84.140503

©2011 American Physical Society

Authors & Affiliations

S. Zapf1, D. Wu1, L. Bogani1, H. S. Jeevan2, P. Gegenwart2, and M. Dressel1

  • 11. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany
  • 2I. Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany

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Issue

Vol. 84, Iss. 14 — 1 October 2011

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