Figure 3
Effect of a 14.8 T magnetic field on the short-range incommensurate AF order in the
sample. For this experiment on Rita-2, a single crystal of mass about 0.5 gram and mosaic of 0.45° was aligned in a 15-T magnet in the
and
scattering plane as shown in the insets of (b) and (c). Neutrons of
were selected, with the nine blades of the analyzer set to probe different points in reciprocal space. Two filters were employed to remove higher order neutrons: a pyrolytic graphite placed just before the sample, along with a
collimator, and cooled Be placed just after the sample. (a) Transverse scans at zero field and at
(below
), 20 K (around
), 25 K (
), and 40 K (above
). The incommensurability
remains at 0.018 for all measured temperatures. (b) Comparison between zero and 14.8 T fields at
. The 14.8 T magnetic field clearly enhances the IC-AF order. (c) Identical scans at
where a 14.8 T field suppresses the incommensurate AF order. (d) The effect of a 14.8 T field on the incommensurate AF order. While the field enhances the IC-AF order at 2 K, it may suppress the IC-AF order in the normal state. (e) Temperature dependence of the magnetic order parameters at the incommensurate position
for 0 and 14.8 T fields. The superconducting transition temperature
is seen to shift from
to
. (f) Magnetic field dependence of the AF Bragg peak intensity at
. The data show a linear field dependence, consistent with a field-induced suppression of the superconducting transition temperature
as determined from resistivity measurements on the same sample (solid blue circles and lines).
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