Abstract
We report X-ray scattering studies of the c-axis lattice parameter in Ca 3Ru 2O 7 as a function of temperature and magnetic field, for B || the ground state easy ( b) axis. The step-like, ∼0.1% change coincides in zero field with a spin reorientation and a metal–insulator transition, at T m − i ≈48 K, and shifts to a lower temperature upon application of magnetic field. At temperatures well below T m − i , negligible change in the c-axis lattice parameter is observed at the metamagnetic transition to the spin-polarized phase, at B c ≈6 T, which indicates that this transition does not couple to the lattice degree of freedom.
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