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PubMed2003

Magnetic phase separation in La1-xSrxCoO3 by 59Co nuclear magnetic resonance.

59Co NMR measurements on La1-xSrxCoO3 reported here establish unequivocally, for the first time, the coexistence of ferromagnetic regions, spin-glass regions, and hole-poor low spin regions at all x values from 0.1 to 0.5. A zero external field NMR spectrum, which is assigned to the ferromagnetic regions, has a spectral shape that is nearly x independent at 1.9 K, as are the relaxation times, T1 and T2. The integrated spectral area increases rapidly with x up to x = 0.2 and then decreases slightly for larger x. In a field of 9.97 T, a narrow NMR line is observed at 102 MHz, identical to that found in x = 0 samples in previous work. The integrated intensity of this spectrum decreases rapidly with increasing x, and is ascribed to hole-poor low spin regions. Beneath this spectrum, a third broad line, with a peak at 100 MHz, is assigned to a spin- or cluster-glass-like phase.

Journal Article↗
PubMed2001

Characterization of relaxed photo-excited magnetized states in prussian-blue analogous magnets.

Local structure of a photo- or x-ray-induced ferrimagnet Cs0.8Co1.3 [W(CN)8](3-cyanopyridine)1.9 x 2.1H2O was investigated by means of Co K- and W L-edge XAFS spectroscopy. The Co K-edge XANES spectra provide quantitative information on the ratio of Co(II) and Co(III) by virtue of the factor analysis. It was found that the Co(II) ratios are 81.9% at 300 K and 32.7% at 150 K. When the sample was irradiated by x rays at 30 K, a phase transformation occurred in a similar manner to the visible-light irradiation and a relaxed excited state that exhibits ferrimagnetism was formed. The relaxed excited state gives the Co(II) ratio of 67.0%. The W L(III)-edge EXAFS spectra determine the W-C, W-N and W-Co distances. The results of the distances were obtained as R(W-C)=2.16 A, R(W-N)=3.31 A, R(W-CoII)=5.37 A and R(W-CoIII)=5.19 A, irrespective of the three phases. The local structure of the relaxed excited state was found to be identical with that of the high-temperature (300 K) phase. The phase transformation is concluded to be caused by the charge transfer and the spin flipping from the -W(IV)(S=0)-CN-CoIII (S=0)- configuration to -W(V)(S=1/2)-CN-CoII (S=3/2)-.

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