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|Title:||Superexchange Coupling and Slow Magnetic Relaxation in a Transuranium Polymetallic Complex|
|Authors:||MAGNANI Nicola; COLINEAU Eric; ELOIRDI Rachel; GRIVEAU Jean-Christophe; CACIUFFO Roberto; CORNET S. M.; MAY I; SHARRAD C. A.; COLLISON D.; WINPENNY R.e.p.|
|Citation:||PHYSICAL REVIEW LETTERS vol. 104 no. 19 p. 197202-1, 4|
|Publisher:||AMER PHYSICAL SOC|
|Type:||Articles in periodicals and books|
|Abstract:||[NpVIO2Cl2][NpVO2Cl(thf)3]2 is the first studied example of a polymetallic transuranic complex displaying both slow relaxation of the magnetization and effective superexchange interactions between 5f centers. The coupling constant for NpV-NpVI pairs is 10.8 K, more than 1 order of magnitude larger than the common values found for rare-earth ions in similar environments. The dynamic magnetic behavior displays slow relaxation of magnetization of molecular origin with an energy barrier of 140 K, which is nearly twice the size of the highest barrier found in polymetallic clusters of the d block. Our observations also suggest that future actinide-based molecular magnets will have very different behavior to lanthanide-based clusters.|
|JRC Directorate:||Nuclear Safety and Security|
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