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Ferro-type order of magneto-electric quadrupoles as an order-parameter for the pseudo-gap phase of a cuprate superconductor

DOI: 10.1088/0953-8984/27/29/292201 DOI Help
PMID: 26153665 PMID Help

Authors: Stephen Lovesey (Diamond Light Source) , Dmitry Khalyavin (ISIS Pulsed Neutron and Muon Source) , Urs Staub (Paul Scherrer Inst)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Physics: Condensed Matter , VOL 27

State: Published (Approved)
Published: July 2015

Abstract: There is general agreement within the community of researchers that investigate high-Tc materials that it is most important to understand the pseudo-gap phase. To this end, many experiments on various cuprates have been reported. Two prominent investigations—Kerr effect and neutron Bragg diffraction—imply that underdoped YBCO samples possess longrange magnetic order of an unusual kind. However, other measurements do not support the existence of magnetic order. Here we show that the Kerr effect and magnetic Bragg diffraction data are individual manifestations of ordered magneto-electric quadrupoles at Cu sites. While the use of magneto-electric multipoles is new in studies of the electronic properties of cuprates, they are not unknown in other materials, including an investigation with x-rays of the parent compound CuO. We exploit the recent prediction that neutrons are deflected by magneto-electric multipoles. The outcome of our study is a theory for the order-parameter of the pseudo-gap phase without the aforementioned conflict with other measurements, and the first experimental evidence that neutrons interact with multipoles belonging to a state of magnetic charge.

Journal Keywords: pseudo-gap phase, magneto-electric multipoles, neutron diffraction, Kerr Effect

Subject Areas: Physics

Technical Areas: Theoretical Physics

Added On: 08/01/2016 13:09

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