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. 2013 Jun 7;110(23):237002.
doi: 10.1103/PhysRevLett.110.237002. Epub 2013 Jun 5.

EuFe2(As(1-x)P(x))2: reentrant spin glass and superconductivity

S Zapf  1 , H S Jeevan  2 , T Ivek  1 , F Pfister  1 , F Klingert  1 , S Jiang  1 , D Wu  1 , P Gegenwart  2 , R K Kremer  3 , M Dressel  1
Affiliations

EuFe2(As(1-x)P(x))2: reentrant spin glass and superconductivity

S Zapf et al. Phys Rev Lett. .

Abstract

By systematic investigations of the magnetic, transport, and thermodynamic properties of single crystals of EuFe(2)(As(1-x)P(x))(2) (0≤x≤1), we explore the complex interplay of superconductivity and Eu(2+) magnetism. Below 30 K, two magnetic transitions are observed for all P substituted crystals, suggesting a revision of the phase diagram. In addition to the canted A-type antiferromagnetic order of Eu(2+) at ∼20 K, a spin glass transition is discovered at lower temperatures. Most remarkably, the reentrant spin glass state of EuFe(2)(As(1-x)P(x))(2) coexists with superconductivity around x≈0.2.

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