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Evolution of magnetic states in frustrated diamond lattice antiferromagnetic Co(Al1-xCox)2O4 spinels | | O. Zaharko
; A. Cervellino
; V. Tsurkan
; N. B. Christensen
; A. Loidl
; | | Date: |
17 Aug 2009 | | Abstract: | Using neutron powder diffraction and Monte-Carlo simulations we show that a
spin-liquid regime emerges at all compositions in the diamond-lattice
antiferromagnets Co(Al1-xCox)2O4. This spin-liquid state induced by frustration
due to the second-neighbour exchange coupling J2, is superseded by
antiferromagnetic collinear long-range order (k=0) at low temperatures. Upon
substitution of Al3+ by Co3+ in the octahedral B-site the temperature range of
the spin-liquid phase narrows and T_N increases, but in contrast to previous
findings, our analysis shows that the ratio J2/J1 remains near 0.12 for all
compositions. We conclude that Co(Al1-xCox)2O4 is just below the theoretical
critical point J2/J1=1/8, and that both J1 and J2 increase with increasing x
due to a higher efficiency of O-Co-O as an interaction path compared to O-Al-O. | | Source: | arXiv, 0908.2318 | | Services: | Forum | Review | PDF | Favorites | |
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