Ordered state of magnetic charge in the pseudo-gap phase of a cuprate
superconductor (HgBa2CuO4)
release_ti7f6vzowvhmbmlphjxsx3xvo4
by
S. W. Lovesey, D. D. Khalyavin
2015
Abstract
A symmetry-based interpretation of published experimental results
demonstrates that the pseudo-gap phase of underdoped HgBa2CuO4(Hg1201)
possesses an ordered state of magnetic charge epitomized by Cu magnetic
monopoles. Magnetic properties of one-layer Hg1201 and two-layer YBa2Cu3O6 + x
(YBCO) cuprates have much in common, because their pseudo-gap phases possess
the same magnetic space-group, e.g., both underdoped cuprates allow the
magneto-electric (Kerr) effect. Differences in their properties stem from
different Cu site symmetries, leaving Cu magnetic monopoles forbidden in YBCO.
Resonant x-ray Bragg diffraction experiments can complement the wealth of
information available from neutron diffraction experiments on five Hg1201
samples on which our findings are based. In the case of Hg1201 emergence of the
pseudo-gap phase, with time-reversal violation, is accompanied by a reduction
of Cu site symmetry that includes loss of a centre of inversion symmetry. In
consequence, parity-odd x-ray absorption events herald the onset of the
enigmatic phase, and we predict dependence of corresponding Bragg spots on
magneto-electric multipoles, including the monopole, and the azimuthal angle
(crystal rotation about the Bragg wavevector).
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