Magnetic and charge transport properties of the Na-based Os oxide pyrochlore (2008)
Shi, Y. G., Belik, A. A., Tachibana, M., Tanaka, M., Katsuya, Y., Kobayashi, K., ...
Na-based osmium oxide pyrochlore was synthesized for the first time by an ion-exchange method. KOs2O6 was used as a host compound. Elelectron probe micro-analysis, synchrotron x-ray diffraction...
Synthesis and superconducting properties of the iron oxyarsenide TbFeAsO0.85 (2008)
Shi, Y. G., Yu, S., Belik, A. A., Matsushita, Y., Tanaka, M., Katsuya, Y., ...
The iron oxyarsenide TbFeAsO0.85 was synthesized by a high-pressure method. A high-quality polycrystalline sample was obtained and characterized by measurements of magnetic susceptibility and...
Electronic structure and electron energy-loss spectra of Sr0.35CoO2 (2006)
Xiao, R. J., Yang, H. X., Xu, L. F., Zhang, H. R., Shi, Y. G., Li, J. Q.
The electronic structure of Sr0.35CoO2, structurally analogous to the layered NaxCoO2, has been evaluated using the local spin density approximation (LSDA). We find that evident c-dispersions appear...
Raman Spectroscopy Study of alpha-, beta-, gamma-NaxCoO2 and gamma-(Ca,Sr)xCoO2 (2006)
Yang, H. X., Xia, Y., Shi, Y. G., Tian, H. F., Xiao, R. J., Liu, X., ...
Raman spectroscopy measurements have been performed on alpha-, beta-, gamma-NaxCoO2 phases differing in their stacking of CoO6 octahedra along the c-axis direction. The results demonstrate that, in...
Shi, Y. G., Yang, H. X., Huang, H., Liu, X., Li, J. Q.
Two series of alpha and beta-NaxCoO2 materials have been prepared by means of Na deintercalation from the parent alpha-NaCoO2 and beta-Na0.6CoO2 phases, respectively. The...
Structural properties and cation ordering in layered hexagonal CaxCoO2 (2005)
Yang, H. X., Shi, Y. G., Liu, X., Xiao, R. J., Tian, H. F., Li, J. Q.
A series of CaxCoO2 (0.15
Zhang, W. Y., Zhao, Y. G., Guo, Z. P., Qiao, P. T., Cui, L., Luo, L. B., ...
Effect of Ti doping on the electrical transport and magnetic properties of layered Na0.8Co1-xTixO2 compounds has been investigated. The lattice parameters a and c increase with x. A minor amount of...
Yang, H. X., Shi, Y. G., Guo, Y. Q., Liu, X., Xiao, R. J., Luo, J. L., ...
Layered Sr0.35CoO2 has been synthesized by means of an ion exchange reaction from Na0.7CoO2. Resistivity measurements show that this material can be either metallic or semiconducting depending on the...
Effects of Mn and Ti doping on superconductivity and charge ordering in NaxCoO2 system (2005)
Shi, Y. G., Yang, H. X., Liu, X., Ma, W. J., Nie, C. J., Huang, W. W., ...
The superconductivity in Na0.3Co1-xMxO2.1.3H2O and the charge ordering in Na0.5Co1-xMxO2 have been investigated for M = Mn and Ti substituting for Co. We have first successfully synthesized the...
Electron energy loss spectra of Na0.33CoO2.yH2O (y = 0, 0.6 and 1.3) (2004)
Li, J. Q., Yang, H. X., Xiao, R. J., Shi, Y. G., Zhang, H. R
Electron energy loss (EEL) spectra have been obtained on materials with the nominal compositions of Na0.33CoO2_yH2O (y = 0, 0.6 and 1.3). Spectral analyses revealed systematic changes in the low-loss...
Yang, H. X., Nie, C. J., Shi, Y. G., Yu, H. C., Ding, S., Liu, Y. L., ...
The nonstoichiometric NaxCoO2 system exhibits extraordinary physical properties that correlate with temperature and Na concentration in its layered lattice without evident long-range structure...
Yang, H. X., Shi, Y. G., Nie, C. J., Wu, D., Yang, L. X., Dong, C., ...
Transmission electron microscopy observations reveal the presence of complex superstructures and remarkable phase separation in association with Na-ordering phenomenon in y-Na0.5CoO2. Resistivity and...
Raman spectroscopy study of NaxCoO2 and superconducting NaxCoO2.yH2O (2004)
Shi, Y. G., Liu, Y. L., Yang, H. X., Nie, C. J., Jin, R., Li, J. Q.
The Raman spectra of the parent compound NaxCoO2 (x=0.75) and the superconducting oxyhydrates NaxCoO2.yH2O with different superconducting temperatures (Tc) have been measured. Five Raman active...
Superstructure, sodium ordering and antiferromagnetism in NaxCoO2 (0.75 (2004)
Shi, Y. G., Yu, H. C., Nie, C. J., Li, J. Q.
Transmission-electron-microscopy investigation reveals the presence of a superstructure with a doubled period of 2d110 in the NaxCoO2 materials for x ranging from 0.75 to 1.0. Systematic analyses...
Effects of Mn-substitution for Co on the structure and physical properties of NayCoO2 (2003)
Zhang, W. Y., Yu, H. C., Zhao, Y. G., Zhang, X. P., Shi, Y. G., Cheng, Z. H., ...
Structure, transport and magnetic properties have been investigated for layered NaCo1-xMnxO2 materials. With the increase of Mn-doping amount, measurements of x-ray diffraction indicate that the...
Tunneling spectroscopy of Na$_{x}$CoO$_2$ and Na$_{x}$CoO$_2$$\cdot$ yH$_2$O (2003)
Shan, L., Gao, H., Shi, Y. G., Yang, H. P., Lu, X. F., Cao, G. H., ...
The single electron tunneling spectroscopy on superconductor Na$_{x}$CoO$_2$$\cdot$ yH$_2$O and its starting compound Na$_{x}$CoO$_2$ has been studied with point-contact method. The spectra of...
Structure and physical properties of NaxCoO2.yH2O superconducting system (2003)
Shi, Y. G., Li, J. Q., Yu, H. C., Zhou, Y. Q., Zhang, H. R., Dong, C.
The structural properties of NaxCoO2 and NaxCoO2yH2O have been investigated. The NaxCoO2yH2O samples in general show up the superconducting transitions at around 3.5K. EDAX analyses suggest our...
The relative levels of rRNAs and ribosomal proteins are coordinately regulated by growth rate and carbon nutrition in Neurospora crassa. However, little is known about the mechanisms involved. To...
The relative levels of rRNAs and ribosomal proteins are coordinately regulated by growth rate and carbon nutrition in Neurospora crassa. However, little is known about the mechanisms involved. To...