The acoustic de Haas-van Alphen (dHvA) effect and temperature dependence of the transverse mode (C11 - C12)/2 have been measured in a layered Perovskite superconductor Sr2RuO4 with Txc = 1.42K. From the acoustic dHvA oscillations for α and β orbits along , the area coefficients are estimated to be |ΛαB1g| = 0.8 and |ΛβB1g| = 0.2 ∼ 0.3. Both Fermi surfaces consisting of hybridized Ru-4dzx(yz) Orbitals couple weakly to εxx - εyy, because the in-plane shear strain hardly varies the spacing between the alternating RuO2 layers. Large softening occurs below 220K, which corresponds to the rotational instability. The rotational deformation of the RuO6 octahedron is induced perturbingly by εxx - εyy which reduces the lattice matching.
- Acoustic de Haas-van Alphen effect
- Spin-triplet superconductor
ASJC Scopus subject areas
- Physics and Astronomy(all)