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Spontaneous cycloidal order mediating a spin-reorientation transition in a polar metal

DOI: 10.1103/PhysRevB.102.180410 DOI Help

Authors: C. D. Dashwood (University College London) , L. S. I. Veiga (University College London) , Q. Faure (University College London) , J. G. Vale (University College London) , D. G. Porter (Diamond Light Source) , S. P. Collins (Diamond Light Source) , P. Manuel (ISIS Neutron and Muon Source) , D. D. Khalyavin (ISIS Pulsed Neutron and Muon Source) , F. Orlandi (ISIS Neutron and Muon Source) , R. S. Perry (University College London (UCL)) , R. D. Johnson (University College London) , D. F. Mcmorrow (University College London)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 102

State: Published (Approved)
Published: November 2020
Diamond Proposal Number(s): 23580

Abstract: We show how complex modulated order can spontaneously emerge when magnetic interactions compete in a metal with polar lattice distortions. Combining neutron and resonant x-ray scattering with symmetry analysis, we reveal that the spin reorientation in Ca 3 Ru 2 O 7 is mediated by a magnetic cycloid whose eccentricity evolves smoothly but rapidly with temperature. We find the cycloid to be highly sensitive to magnetic fields, which appear to continuously generate higher harmonic modulations. Our results provide a unified picture of the rich magnetic phases of this correlated, multiband polar metal.

Journal Keywords: Antiferromagnetism; Magnetic anisotropy; Magnetic phase transitions; Magnetic texture; Antiferromagnets; Noncentrosymmetric materials; Noncollinear magnets; Ruthenates; Strongly correlated systems; Quasi elastic neutron scattering; Resonant elastic x-ray

Subject Areas: Materials, Physics

Instruments: I16-Materials and Magnetism

Other Facilities: ISIS Neutron and Muon Source