Interdependence of magnetism and superconductivity in the borocarbide TmNi2B2C

Details Interdependence of magnetism and superconductivity in the borocarbide TmNi2B2C Interdependence of magnetism and superconductivity in the borocarbide TmNi2B2C

1999-12-16

arxiv.org/abs/cond-mat/9912299v1

Physics

Condensed Matter

Scientific paper

We have discovered a new antiferromagnetic phase in TmNi2B2C by neutron diffraction. The ordering vector is Q_A = (0.48,0,0) and the phase appears above a critical in-plane magnetic field of 0.9 T. The field was applied in order to test the assumption that the zero-field magnetic structure at Q_F = (0.094,0.094,0) would change into a c-axis ferromagnet if superconductivity were destroyed. We present theoretical calculations which show that two effects are important: A suppression of the ferromagnetic component of the RKKY exchange interaction in the superconducting phase, and a reduction of the superconducting condensation energy due to the periodic modulation of the moments at the wave vector Q_A.

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