Electron spin resonance (ESR) measurements have been performed on a series of quasi-one-dimensional iodo-bridged diplatinum complexes K 2[C 3H 5R(NH 3) 2][Pt 2(pop) 4I]•4H 2O (pop = P 2H 2O 52 -; R = H, CH 3, or Cl), where dehydration/rehydration of the crystalline water switches the electronic state reversibly with retention of single crystallinity. We have observed a nonmagnetic nature in as-grown samples, whereas in the dehydrated samples, a clear enhancement of the spin susceptibility has been observed above ∼80 K with the activation energy ranging 50-60 meV. The activated spins originate from isolated Pt3 + state on the chain, as confirmed from the principal g values. Concomitantly, the ESR linewidth exhibits a prominent motional narrowing, suggesting that the activated Pt3 + spins are mobile solitons generated in the doubly degenerate charge-density-wave states of the dehydrated salts.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2012 Feb 21|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics