Dresden 2011 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 36: SC: Fe-based Superconductors - 122 - Properties, Electronic Structure, Mechanisms
TT 36.8: Talk
Wednesday, March 16, 2011, 16:00–16:15, HSZ 304
Interplay of antiferromagnetism, ferromagnetism and superconductivity in EuFe2(As1−xPx)2 single crystals — •Hirale S. Jeevan, Jannis Maiwald, and Philip Gegenwart — I. Physikalisches Institut, Georg-August-Universitaet Goettingen, Friedrich Hund Platz 1, 37077 Goettingen, Germany
We present a systematic study on the influence of antiferromagnetic and ferromagnetic phases of Eu2+ moments on the superconducting phase upon doping the As site by isovalent P, which acts as chemical pressure on EuFe2As2. In this contribution, we shall report the magnetic susceptibility, magnetization, resistivity, specific heat and thermal conductivity measurements performed on P doped EuFe2As2 single crystals. Bulk superconductivity with transition temperatures of 22 K and 28 K is observed for x = 0.16 and 0.20 samples respectively. The Eu ions order antiferromagnetically for x = 0.13, while a crossover is observed for x = 0.22 whereupon the Eu ions order ferromagnetically. We discuss in detail the coexistence of superconductivity and magnetism in a tiny region of the phase diagram and comment on the competition of ferromagnetism and superconductivity in the title compound. In collaboration with Deepa Kasinathan and H.Rosner