| Autor: |
Murayama, Kantaro, Takatsu, Hiroshi, Ochi, Masayuki, Namba, Morito, Kuroki, Kazuhiko, Kageyama, Hiroshi |
| Zdroj: |
Journal of the Physical Society of Japan; 6/15/2022, Vol. 91 Issue 6, p1-5, 5p |
| Abstrakt: |
We have recently demonstrated the formation of 15R-type SrVO2.2N0.6 with an anion-vacancy order in the [111] direction from the cubic SrVO3 perovskite by topochemical reactions, but in epitaxial thin films the anion-vacancy order pattern changes. In the present study, the effect of partial Sr-site substitution by Ca on the structure and physical properties was investigated. We found that the 15R structure is preserved up to a Ca-substitution of 20%, with nearly isotropic lattice compression (Δa = −0.52% and Δc = −0.67%). This result indicates that the switching behavior of the anion-vacancy layers observed in the thin films is due to anisotropic biaxial strain and that the 15R-phase is robust against isotropic chemical pressure. First-principle theoretical calculations support this interpretation, revealing that anion-vacancy plane switching under isotropic pressure in SrVO2.2N0.6 requires >4 GPa corresponding to ∼1% strain. Magnetization and specific heat measurements of the Ca-substituted samples suggest a possible increase in magnetic fluctuations in the low-temperature regime relative to the pristine SrVO2.2N0.6 with a two-dimensional electronic structure. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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