We report a synchrotron x-ray-scattering study of the diluted spin-Peierls (SP) material (Formula presented) In a recent paper we have shown that the SP dimerization attains long-range order only for (Formula presented) Here we report that the SP transition is reentrant in the vicinity of the critical concentration (Formula presented) This is manifested by broadening of the SP dimerization superlattice peaks below the reentrance temperature (Formula presented) which may mean either the complete loss of the long-range SP order or the development of a short-range ordered component within the long-range ordered SP state. Very long relaxation times and related marked hysteresis are found in samples with Mg concentrations in the vicinity of (Formula presented) The reentrant SP transition is likely related to the competing Néel transition which occurs at a temperature similar to (Formula presented) We argue that impurity-induced competing interchain interactions play an essential role in these phenomena.
|Original language||English (US)|
|Number of pages||5|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - 2000|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics