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We use polarised neutron diffraction to study the induced magnetizationdensity of near optimally doped Ba(Fe0.935Co0.065)2As2 (T_C=24 K) as a functionof magnetic field (1<H<9 T) and temperature (2<T<300 K). The T-dependence ofthe induced moment in the superconducting state is consistent with the Yosidafunction, characteristic of spin-singlet pairing. The induced moment isproportional to applied field for H < 9 T ~ Hc2/6. In addition to the Yosidaspin-susceptibility, our results reveal a large zero-field contribution M(H=>0,T=>0)/H ~ 2/3 \chi_{normal} which does not scale with the field or numberof vortices and is most likely due to the van Vleck susceptibility. Magneticstructure factors derived from the polarization dependence of 15 Braggreflections were used to make a maximum entropy reconstruction of the inducedmagnetization distribution in real space. The magnetization is confined to theFe atoms and the measured density distribution is in good agreement with LAPWband structure calculations which suggest that the relevant bands near theFermi energy are of the d_{xz/yz} and d_{xy} type.

A polarized neutron diffraction study of the field-induced magnetization in the normal and superconducting states of Ba(Fe1-xCox)2As2 (x=0.65)