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In the temperature (T)-nuQ3 phase diagram of NaxCoO2 \dot yH2O, there exist two superconducting regions of nuQ3 separated by the nonsuperconducting region, where nuQ3 is usually estimated from the peak position of the 59Co-NQR spectra of the 5/2-7/2
Externí odkaz:
http://arxiv.org/abs/0803.3253
The effect of the 16O-->18O substitution on the superconducting transition temperatures Tc of NaxCoO2.yH2O has been studied for several sets of samples. Each set has two kinds of samples, one with the oxygen sites in the CoO2 layers filled with 16O a
Externí odkaz:
http://arxiv.org/abs/0803.3254
59Co- and 23Na-NMR measurements have been carried out on polycrystalline and c-axis aligned samples of Na0.5CoO2, which exhibits successive transitions at temperatures T = 87 K (= Tc1) and T = 53 K (= Tc2). 59Co-NMR has also been carried out on c-axi
Externí odkaz:
http://arxiv.org/abs/0803.3255
Publikováno v:
J. Phys. Soc. Jpn. 75 (2006) 074717.
Studies of the NMR Knight shift K of Na0.3CoO2.yH2O have been carried out in detail. The suppression of K by the occurrence of the superconductivity reported previously by the present authors in both magnetic field directions perpendicular and parall
Externí odkaz:
http://arxiv.org/abs/cond-mat/0602323
Autor:
Yokoi, Mai, Moyoshi, Taketo, Kobayashi, Yoshiaki, Soda, Minoru, Yasui, Yukio, Sato, Masatoshi, Kakurai, Kazuhisa
Publikováno v:
J. Phys. Soc. Jpn. 74 (2005) No.11 3046-3056.
Data taken by various kinds of methods including NMR/NQR and neutron scattering are presented for NaxCoO2, in particular, for Na0.5CoO2. Attentions have also been paid to the x dependence of the electronic nature. The pseudo-gap-like behavior observe
Externí odkaz:
http://arxiv.org/abs/cond-mat/0506220
Autor:
Kobayashi, Yoshiaki, Watanabe, Hidekazu, Yokoi, Mai, Moyoshi, Taketo, Mori, Yoshihiko, Sato, Masatoshi
Publikováno v:
J. Phys. Soc. Jpn. 74 (2005) No.6 1800.
Temperature (T) dependence of 59Co-NMR Knight shifts K of Na0.3CoO2.1.3H2O has been studied, where samples of randomly oriented powder and aligned crystals have been used for the applied magnetic fields H // ab plane and H //c-axis, respectively. For
Externí odkaz:
http://arxiv.org/abs/cond-mat/0412466
Publikováno v:
J. Phys. Soc Jpn. 72 (2003) 2453.
Layered Co oxide NaxCoO2.yH2O with the superconducting transition temperature Tc =4.5 K has been studied by 59Co-NMR. The Knight shift K estimated from the observed spectra for powder sample exhibits almost temperature(T)-independent behavior above T
Externí odkaz:
http://arxiv.org/abs/cond-mat/0306264
Publikováno v:
J, Phys. Soc. Jpn. 73 (2003) 2161.
Layered Co oxide NaxCoO2.yH2O with a superconducting transition temperature Tc =4.5 K has been studied by 59Co NQR. The nuclear spin relaxation rate 1/59T1 is nearly proportional to temperature T in the normal state. In the superconducting state, it
Externí odkaz:
http://arxiv.org/abs/cond-mat/0305649
Publikováno v:
In Journal of Magnetism and Magnetic Materials 2007 310(2) Part 1:672-674
