TITLE

Direct measurement of Co-ion spin state transitions in Ca3Co4O9 using variable-temperature electron energy-loss spectroscopy

AUTHOR(S)
Yang, Guang; Ramasse, Quentin; Klie, Robert F.
PUB. DATE
March 2009
SOURCE
Applied Physics Letters;3/2/2009, Vol. 94 Issue 9, pN.PAG
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Previous studies of Ca3Co4O9 suggested that the abrupt changes in the magnetic susceptibility and electrical resistivity at ∼420 K can be attributed to Co spin state transitions. In this letter, we study the possible transitions above 420 K by variable-temperature Z-contrast imaging and electron energy-loss spectroscopy. We find that there is no observable change in the structure and Co valence state upon in situ heating to 500 K, compared to room temperature. However, an intensity decrease of the prepeak in the O K-edge near edge fine structure indicates a Co3+-ion spin state transition has occurred from a low to an intermediate spin state.
ACCESSION #
36940951

 

Related Articles

  • Effect of doping on the magnetic ordering of quasi-one-dimensional antiferromagnets. Zvyagin, A. A. // Low Temperature Physics;Feb2006, Vol. 32 Issue 2, p158 

    We have studied theoretically how nonmagnetic dopants, which change the local coupling of spins to the host, affect the low-temperature thermodynamic characteristics of quasi-one-dimensional (Q1D) quantum spin antiferromagnets. Our theory qualitatively and, in some cases, quantitatively...

  • The 21/3 rule for magnetic susceptibility of gadolinium. Korolev, A. V.; Kurkin, M. I.; Sokolov, O. B.; Orlova, N. B. // Physics of the Solid State;Mar2010, Vol. 52 Issue 3, p561 

    The dependences of the magnetization M and the magnetic susceptibility χ = ∂ M/∂ H of pure gadolinium (the concentration of foreign impurities is lower than 0.1 wt %) on the temperature T and the magnetic field H have been measured using a Quantum Design MPMS-5XL SQUID...

  • Nanometer-scale strain measurements in semiconductors: An innovative approach using the plasmon peak in electron energy loss spectra. Sanchez, A. M.; Beanland, R.; Papworth, A. J.; Goodhew, P. J.; Gass, M. H. // Applied Physics Letters;1/30/2006, Vol. 88 Issue 5, p051917 

    We present an innovative technique for quantitative measurement of strain in semiconductor materials with high spatial resolution. The plasmon loss peak, seen in electron energy-loss spectra, has been considered following the Drude-Lorentz model, and we find that plasmon energy is extremely...

  • Low-field ac magnetic susceptibility under pressure in GdMn2 and TbMn2 intermetallics. Ibarra, M. R.; Arnold, Z.; Marquina, C.; García-Orza, L.; del Moral, A. // Journal of Applied Physics;5/15/1994, Vol. 75 Issue 10, p7158 

    Presents information on a study that performed low-field alternating current susceptibility experiments under pressure on the GdMn[sub2] and TbMn[sub2] compounds in the temperature range of 4-300 Kelvin. Experimental procedure; Results and discussion on the study; Conclusion.

  • Quantum size effects in the volume plasmon excitation of bismuth nanoparticles investigated by electron energy loss spectroscopy. Wang, Y. W.; Kim, J. S.; Kim, G. H.; Kim, Kwang S. // Applied Physics Letters;4/3/2006, Vol. 88 Issue 14, p143106 

    Quantum size effects in volume plasmon excitation of bismuth nanoparticles with diameters ranging from 5 to 500 nm have been studied by electron energy loss spectroscopy. The Bi nanoparticles were prepared by reducing Bi3+ with sodium borohydride in the presence of poly(vinylpyrroldone). The...

  • Graded composition and valence states in self-forming barrier layers at Cu–Mn/SiO2 interface. Otsuka, Y.; Koike, J.; Sako, H.; Ishibashi, K.; Kawasaki, N.; Chung, S. M.; Tanaka, I. // Applied Physics Letters;1/4/2010, Vol. 96 Issue 1, p012101 

    A self-forming diffusion barrier (SFB) layer was formed at Cu–Mn/SiO2 interface. Spatial variation of the chemical composition and valence state of the elements in the SFB was investigated in a subnanometer resolution using electron energy loss spectroscopy and transmission electron...

  • I. Electron-impact ionization and dissociation of C2H and C2D. Cherkani-Hassani, H.; Cherkani-Hassani, S.; Belic, D. S.; Jureta, J. J.; Lecointre, J.; Defrance, P. // European Physical Journal D -- Atoms, Molecules, Clusters & Opti;Jun2010, Vol. 58 Issue 1, p75 

    Absolute cross-sections for electron-impact ionization and dissociation of C2H and C2D have been measured for electron energies ranging from the corresponding thresholds up to 2.5 keV. The animated crossed beams experiment has been used. Light as well as heavy fragment ions that are produced...

  • Application of high-resolution EFTEM SI in an AEM. Schaffer, Bernhard; Grogger, Werner; Kothleitner, Gerald; Hofer, Ferdinand // Analytical & Bioanalytical Chemistry;Mar2008, Vol. 390 Issue 6, p1439 

    In this work we show how energy-filtered imaging can be used to obtain spectrum images of electron energy-loss spectrometric data. Focus is placed on improved energy resolution within these data sets. Using two multilayer samples (GaN/AlN and InP/InAs), we demonstrate the advantages of...

  • Ethene stabilization on Cu(111) by surface roughness. Skibbe, Olaf; Vogel, Diana; Binder, Martin; Pucci, Annemarie; Kravchuk, Tatyana; Vattuone, Luca; Venugopal, Vinay; Kokalj, Anton; Rocca, Mario // Journal of Chemical Physics;7/14/2009, Vol. 131 Issue 2, p024701 

    The molecular vibrations of ethene adsorbed on roughened Cu(111) surfaces have been investigated with high resolution electron energy loss spectroscopy and density-functional-theory calculations. The roughness was introduced by sputtering or evaporation of copper, respectively, on the cooled...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics