Weak Ferromagnetism Accompanying Loop current order in Underdoped Cuprates

Abstract

We discuss the necessary symmetry conditions and the different ways in which they can be physically realized for the occurrence of ferromagnetism accompanying the loop current orbital magnetic order observed by polarized neutron-diffraction experiments or indeed any other conceivable principal order in the under-doped phase of cuprates. We contrast the Kerr effect experiments in single crystals observing ferromagnetism with the direct magnetization measurements in large powder samples, which do not observe it. We also suggest experiments to resolve the differences among the experiments, all of which we believe to be correct.

4 pages

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Cited by in corpus (3)

• Detection of the Unusual Magnetic Orders in the Pseudogap Region of a High-Temperature Superconducting YBa2Cu3O6.6 Crystal by Muon-Spin Relaxation
• Evidence for Intra-Unit-Cell magnetic order in Bi2Sr2CaCu2O8+d
• Screening of point charge impurities in highly anisotropic metals: application to ${\mu }^{+}$ spin relaxation in underdoped cuprates