Magnetic structure of the Eu2+ moments in superconducting   EuFe2(As1-xPx)2 with x = 0.19
  The magnetic structure of the Eu2+ moments in the superconducting EuFe2(As1-xPx)2 sample with x = 0.19 has been determined using neutron scattering. We conclude that the Eu2+ moments are aligned along the c direction below T_C = 19.0(1) K with an ordered moment of 6.6(2) mu_B in the superconducting state. An impurity phase similar to the underdoped phase exists within the bulk sample which orders antiferromagnetically below T_N = 17.0(2) K. We found no indication of iron magnetic order, nor any incommensurate magnetic order of the Eu2+ moments in the sample. 
S. Nandi, W. T. Jin, Y. Xiao, Y. Su, S. Price, W. Schmidt, K.   Schmalzl, T. Chatterji, H. S. Jeevan, P. Gegenwart, and Th. ...
cond-mat.supr-con cond-mat.str-el