Phonon-induced quadrupolar ordering of the magnetic superconductor TmNi$_2$B$_2$C

Details Phonon-induced quadrupolar ordering of the magnetic superconductor TmNi$_2$B$_2$C Phonon-induced quadrupolar ordering of the magnetic superconductor TmNi$_2$B$_2$C

2005-08-26

arxiv.org/abs/cond-mat/0508630v1

Physics

Condensed Matter

Superconductivity

submitted to PRL

Scientific paper

10.1103/PhysRevB.73.020504

We present synchrotron x-ray diffraction studies revealing that the lattice of thulium borocarbide is distorted below T_Q = 13.5 K at zero field. T_Q increases and the amplitude of the displacements is drastically enhanced, by a factor of 10 at 60 kOe, when a magnetic field is applied along [100]. The distortion occurs at the same wave vector as the antiferromagnetic ordering induced by the a-axis field. A model is presented that accounts for the properties of the quadrupolar phase and explains the peculiar behavior of the antiferromagnetic ordering previously observed in this compound.

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