References
59
Fig. 7.2 Imaginary part of susceptibility for a Dy 2 Ti 2 O 7 sample vs frequency from Kassner et al.
is plotted here for temperature range of 0.8K to 3K. Figure reproduced with permission from from
Ref. [1]
through the pickup coil due to the dipole fields from spins in the sample, and the
noise is coming fundamentally from spin flips (aka monopole hops). The flux at the
pickup coil due to a single spin in the sample depends on where that spin is and
which way it is pointing. Some spins are invisible (e.g. spins pointing to a direction
in the xy plane) and some have a greater effect, e.g. spins close to, but not at the
edge, in or near the plane of the coil, pointing along z. If there is a fluctuation of
the magnetic moment of the whole sample, resulting in a net moment, then that
would produce a net demagnetization field which all the spins would experience,
potentially affecting their dynamics, and that demagnetization field would be shapedependent.
References
1. E.R. Kassner et al., Supercooled spin liquid state in the frustrated pyrochlore dy2ti2o7. Proc.
Natl. Acad. Sci. 112, 8549 (2015)
2. Yaraskavitch et al., Spin dynamics in the frozen state of the dipolar spin ice material dy2ti2o7.
Phys. Rev. B 85, 020410 (2012)
59
Fig. 7.2 Imaginary part of susceptibility for a Dy 2 Ti 2 O 7 sample vs frequency from Kassner et al.
is plotted here for temperature range of 0.8K to 3K. Figure reproduced with permission from from
Ref. [1]
through the pickup coil due to the dipole fields from spins in the sample, and the
noise is coming fundamentally from spin flips (aka monopole hops). The flux at the
pickup coil due to a single spin in the sample depends on where that spin is and
which way it is pointing. Some spins are invisible (e.g. spins pointing to a direction
in the xy plane) and some have a greater effect, e.g. spins close to, but not at the
edge, in or near the plane of the coil, pointing along z. If there is a fluctuation of
the magnetic moment of the whole sample, resulting in a net moment, then that
would produce a net demagnetization field which all the spins would experience,
potentially affecting their dynamics, and that demagnetization field would be shapedependent.
References
1. E.R. Kassner et al., Supercooled spin liquid state in the frustrated pyrochlore dy2ti2o7. Proc.
Natl. Acad. Sci. 112, 8549 (2015)
2. Yaraskavitch et al., Spin dynamics in the frozen state of the dipolar spin ice material dy2ti2o7.
Phys. Rev. B 85, 020410 (2012)