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Lattice-site-specific spin-dynamics in double perovskite Sr2CoOsO6
- Source :
- Phys. Rev. Lett. 112, 147202 (2014)
- Publication Year :
- 2013
-
Abstract
- We have studied the magnetic properties and spin-dynamics of the structurally-ordered double perovskite Sr$_2$CoOsO$_6$. Our neutron diffraction, muon spin relaxation and ac-susceptibility measurements reveal two antiferromagnetic (AFM) phases on cooling from room temperature down to 2 K. In the first AFM phase, with transition temperature $T_{\mathrm{N}}=108$ K, cobalt (3$d^7$, $S=3/2$) and osmium (5$d^2$, $S=1$) moments fluctuate dynamically, while their \textit{average} effective moments undergo long-range order. In the second AFM phase with $T_{\mathrm{N}}=67$ K, cobalt moments first become frozen and induce a noncollinear spin-canted AFM state, while dynamically fluctuating osmium moments are later frozen into a randomly canted state at $T\approx 5$ K. Our \textit{ab initio} calculations indicate that the effective exchange coupling between cobalt and osmium sites is rather weak, so that cobalt and osmium sublattices exhibit different ground states and spin-dynamics, making Sr$_2$CoOsO$_6$ distinct from previously reported double-perovskite compounds.<br />Comment: Accepted by Phys. Rev. Lett. 12 pages, 3 figures and 1 table
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. Lett. 112, 147202 (2014)
- Publication Type :
- Report
- Accession number :
- edsarx.1312.0767
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevLett.112.147202