Weak ferromagnetism and magnetic phase transitions in Gd$_2$CuO$_4$

Details Weak ferromagnetism and magnetic phase transitions in Gd$_2$CuO$_4$ Weak ferromagnetism and magnetic phase transitions in Gd$_2$CuO$_4$

2011-05-31

arxiv.org/abs/1105.6196v1

Phys. Rev. B 84, 054426 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.84.054426

We report a polarised neutron study of the magnetic structures and phase trasitions in \gdc\ in low magnetic fields. These experiments have been complemented by integrated intensity measurements with unpolarised neutrons in zero field. Polarised neutron flipping ratio measurements have been made with magnetic fields $H = 0.05$, 0.10 and 0.5 T in the temperature range 4-20 K. These have enabled us to deduce that the anomalous temperature behaviour of the coherent magnetic scattering from the Cu sublattice, which shows sharp intensity minima at \Tcn1 $\approx 18$K and \Tcn2 $\approx 8$ K, is due to cross-overs in the sign of the interaction between strongly coupled, weakly ferromagnetic, CuO$_2$ layers. At \Tcn1\ the coupling changes from ferromagnetic to anti-ferromagnetic and long-range order between layers is temporarily lost. \Tcn2\ is the temperature at which the Gd moments order and a further reorganisation of the interlayer order takes place. The weak ferromagnetism of the CuO layers is found to be due to a small rotation of the Cu moments in the same direction as that in which their coordinating oxygen squares rotate in the tetragonal to orthorhombic distortion of the crystal structure. Further analysis of the flipping ratio measurements has enabled us to model the magnetic structures of the zero-field and the field-induced phases of Gd$_2$CuO$_4$.

Affiliated with

Also associated with

No associations

Rating

Weak ferromagnetism and magnetic phase transitions in Gd$_2$CuO$_4$ does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Weak ferromagnetism and magnetic phase transitions in Gd$_2$CuO$_4$, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Weak ferromagnetism and magnetic phase transitions in Gd$_2$CuO$_4$ will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-337800