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- W1945172829 abstract "Understanding the pseudo-gap phase from which a superconducting state emerges is a central problem in the physics of cuprates. The phase exists below a temperature T* for less than optimal doping of holes, and no clear jump in the specific heat or change in lattice symmetry is observed on crossing T*. Here we show that, two sets of intriguing experimental results in the literature concerning magnetic properties of underdoped YBCO are united in a single theory based on Cu quadrupole moments. The quadrupole is a product of spin and the electric dipole, so there is no magnetic dipole moment, and standard crystallography describes the magnetic motif. One experiment employed the Kerr effect and the second Bragg diffraction of polarized neutrons, and both are shown to imply an order-parameter for the pseudo-gap phase composed of magneto-electric quadrupoles at in-plane Cu sites in a ferro-type order. The successful interpretation of neutron diffraction data for YBCO yields the first experimental evidence that neutrons are deflected by magneto-electric multipoles. Predicted in 2014, our verification of the effect validates a new application for the experimental technique of choice in studies of magnetic motifs and excitations." @default.
- W1945172829 created "2016-06-24" @default.
- W1945172829 creator A5037940879 @default.
- W1945172829 creator A5049528265 @default.
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- W1945172829 date "2014-08-24" @default.
- W1945172829 modified "2023-10-16" @default.
- W1945172829 title "Ferro-type order of magneto-electric quadrupoles as an order-parameter for the pseudo-gap phase of a cuprate superconductor" @default.
- W1945172829 cites W1585382007 @default.
- W1945172829 doi "https://doi.org/10.48550/arxiv.1408.5562" @default.
- W1945172829 hasPublicationYear "2014" @default.
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