Zobrazeno 1 - 10
of 806
pro vyhledávání: '"Motohashi, T"'
Autor:
Motohashi, T., Sugimoto, Y., Masubuchi, Y., Sasagawa, T., Koshibae, W., Tohyama, T., Yamauchi, H., Kikkawa, S.
Publikováno v:
Phys. Rev. B 83, 195128 (2011)
Thermoelectric properties of the layered cobalt oxide system LixCoO2 were investigated in a wide range of Li composition, 0.98 >= x >= 0.35. Single-phase bulk samples of LixCoO2 were successfully obtained through electrochemical deintercalation of Li
Externí odkaz:
http://arxiv.org/abs/1104.2419
Autor:
Motohashi, T., Ono, T., Sugimoto, Y., Masubuchi, Y., Kikkawa, S., Kanno, R., Karppinen, M., Yamauchi, H.
Publikováno v:
Phys. Rev. B 80, 165114 (2009)
Here we report the magnetic properties of the layered cobalt oxide system, LixCoO2, in the whole range of Li composition, 0 <= x <= 1. Based on dc-magnetic susceptibility data, combined with results of 59Co-NMR/NQR observations, the electronic phase
Externí odkaz:
http://arxiv.org/abs/0909.3556
Autor:
Kawasaki, S., Motohashi, T., Shimada, K., Ono, T., Kanno, R., Karppinen, M., Yamauchi, H., Zheng, Guo-qing
Publikováno v:
Phys. Rev. B 79, 220514(R) (2009)
CoO2 is the parent compound for the superconductor NaxCoO2\cdot1.3H2O and was widely believed to be a Mott insulator. We performed 59Co nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) studies on LixCoO2 (x = 0.35, 0.25, 0.12,
Externí odkaz:
http://arxiv.org/abs/0906.0400
Electrochemical synthesis and properties of CoO2, the x = 0 phase of the AxCoO2 systems (A = Li, Na)
Publikováno v:
Journal of Applied Physics 103, 07C902 (2008)
Single-phase bulk samples of the "exotic" CoO2, the x = 0 phase of the AxCoO2 systems (A = Li, Na), were successfully synthesized through electrochemical de-intercalation of Li from pristine LiCoO2 samples. The samples of pure CoO2 were found to be e
Externí odkaz:
http://arxiv.org/abs/0801.2607
Publikováno v:
Chemistry of Materials 19, 5063-5066 (2007)
We report here the synthesis of single-phase bulk samples of CoO2, the x = 0 end member of the AxCoO2 systems (A = Li, Na), from a pristine LiCoO2 sample using an electrochemical technique to completely de-intercalate lithium. Thus, synthesized CoO2
Externí odkaz:
http://arxiv.org/abs/0708.2528
Publikováno v:
Journal of Physics: Condensed Matter 18, 2157 (2006)
The magnetic and magnetotransport properties of the Sr3Fe2-xCoxO7-d system (0.2 <= x <= 1.0) were systematically investigated. This oxide system exhibits a giant magnetoresistance (GMR) effect at low temperatures, reaching up to 80% in 7 T at 5 K. Ac
Externí odkaz:
http://arxiv.org/abs/cond-mat/0601428
Publikováno v:
Physical Review B 71, 214424 (2005)
The magnetic and magnetotransport properties of the oxygen deficient perovskites, SrCo1-xMxO3-d with M = Nb and Ru, were investigated. Both Nb- and Ru-substituted cobaltites are weak ferromagnets, with transition temperatures Tm of 130-150 K and 130-
Externí odkaz:
http://arxiv.org/abs/cond-mat/0504379
Publikováno v:
Applied Physics Letters 86, 192504 (2005)
The oxygen-deficient perovskite cobaltite SrCo1-xNbxO3-d was synthesized by direct solid-state reaction and its magnetotransport properties were investigated. This cobaltite exhibits an unusual ferromagnetic behavior with a transition temperature Tm
Externí odkaz:
http://arxiv.org/abs/cond-mat/0504378
A three-step route has been developed for the synthesis of a new oxygen-ordered double perovskite, BaYMn2O5.5 or Ba2Y2Mn4O11. (i) The A-site cation ordered perovskite, BaYMn2O5+d, is first synthesized at d ~ 0 by an oxygen-getter-controlled low-O2-pr
Externí odkaz:
http://arxiv.org/abs/cond-mat/0402230
Here we show that the B-site cation (Fe/Mo) ordering in the double-perovskite magnetoresistor, Sr2FeMoO6, is controlled by either kinetics or thermal equilibrium depending on the temperature range. In order to enhance the ordering, long synthesis per
Externí odkaz:
http://arxiv.org/abs/cond-mat/0309393