Strain control of a bandwidth-driven spin reorientation in Ca3Ru2O7

C. D. Dashwood (), A. H. Walker (), M. P. Kwasigroch, L. S. I. Veiga, Q. Faure, J. G. Vale, D. G. Porter, P. Manuel, D. D. Khalyavin, F. Orlandi, C. V. Colin, O. Fabelo, F. Krüger, R. S. Perry, R. D. Johnson, A. G. Green and D. F. McMorrow
Additional contact information
C. D. Dashwood: University College London
A. H. Walker: University College London
M. P. Kwasigroch: University College London
L. S. I. Veiga: University College London
Q. Faure: University College London
J. G. Vale: University College London
D. G. Porter: Harwell Science and Innovation Campus
P. Manuel: STFC Rutherford Appleton Laboratory
D. D. Khalyavin: STFC Rutherford Appleton Laboratory
F. Orlandi: STFC Rutherford Appleton Laboratory
C. V. Colin: Université Grenoble Alpes, CNRS, Institut Néel
O. Fabelo: Institut Laue-Langevin
F. Krüger: University College London
R. S. Perry: University College London
R. D. Johnson: University College London
A. G. Green: University College London
D. F. McMorrow: University College London

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract The layered-ruthenate family of materials possess an intricate interplay of structural, electronic and magnetic degrees of freedom that yields a plethora of delicately balanced ground states. This is exemplified by Ca3Ru2O7, which hosts a coupled transition in which the lattice parameters jump, the Fermi surface partially gaps and the spins undergo a 90∘ in-plane reorientation. Here, we show how the transition is driven by a lattice strain that tunes the electronic bandwidth. We apply uniaxial stress to single crystals of Ca3Ru2O7, using neutron and resonant x-ray scattering to simultaneously probe the structural and magnetic responses. These measurements demonstrate that the transition can be driven by externally induced strain, stimulating the development of a theoretical model in which an internal strain is generated self-consistently to lower the electronic energy. We understand the strain to act by modifying tilts and rotations of the RuO6 octahedra, which directly influences the nearest-neighbour hopping. Our results offer a blueprint for uncovering the driving force behind coupled phase transitions, as well as a route to controlling them.

Date: 2023
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DOI: 10.1038/s41467-023-41714-8

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