Zobrazeno 1 - 10
of 99
pro vyhledávání: '"Cmaidalka, J."'
Publikováno v:
Phys. Rev. B76, 100506(R) (2007)
We report T_c and ^{59}Co nuclear quadrupole resonance (NQR) measurements on the cobalt oxide superconductor Na_{x}CoO_{2}\cdot 1.3H_{2}O (T_c=4.8 K) under hydrostatic pressure (P) up to 2.36 GPa. T_c decreases with increasing pressure at an average
Externí odkaz:
http://arxiv.org/abs/0712.0419
Na content dependence of superconductivity and the spin correlations in Na_{x}CoO_{2}\cdot 1.3H_{2}O
Publikováno v:
J. Phys. Condens. Matter 18 (2006) L63-L70
We report systematic measurements using the ^{59}Co nuclear quadrupole resonance(NQR) technique on the cobalt oxide superconductors Na_{x}CoO_{2}\cdot 1.3H_{2}O over a wide Na content range x=0.25\sim 0.34. We find that T_c increases with decreasing
Externí odkaz:
http://arxiv.org/abs/cond-mat/0601089
Autor:
Tsui, S., Baikalov, A., Cmaidalka, J., Sun, Y. Y., Wang, Y. Q., Xue, Y. Y., Chu, C. W., Chen, L., Jacobson, A. J.
We investigate the polarity-dependent field-induced resistive switching phenomenon driven by electric pulses in perovskite oxides. Our data show that the switching is a common occurrence restricted to an interfacial layer between a deposited metal el
Externí odkaz:
http://arxiv.org/abs/cond-mat/0402687
Autor:
Iliev, M. N., Litvinchuk, A. P., Abrashev, M. V., Popov, V. N., Cmaidalka, J., Lorenz, B., Meng, R. L.
The polarized Raman spectra of stoichiometric LaTiO$_3$ (T$_N = 150$ K) were measured between 6 and 300 K. In contrast to earlier report on half-metallic LaTiO$_{3.02}$, neither strong background scattering, nor Fano shape of the Raman lines was obse
Externí odkaz:
http://arxiv.org/abs/physics/0310097
We report here the correlation between the water content and superconductivity in Na0.3CoO2*yH2O under the influences of elevated temperature and cold compression. The x-ray diffraction of the sample annealed at elevated temperatures indicates that i
Externí odkaz:
http://arxiv.org/abs/cond-mat/0308301
Publikováno v:
Physica C 402, p. 106 (2004)
The heat capacity of superconducting Na(x)CoO(2)*yH(2)O was measured and the data are discussed based on three different models: The thermodynamic Ginzburg-Landau model, the BCS theory, and a model including the effects of line nodes in the supercond
Externí odkaz:
http://arxiv.org/abs/cond-mat/0308143
The polarized Raman spectra from ab and ac surfaces of single crystal NaxCoO2 (x~0.7), parent compound of recently discovered superconductor NaxCoO2.yH2O, are reported and discussed. The crystals were hexagon platelets of typical size 3x3x0.1 mm. Thr
Externí odkaz:
http://arxiv.org/abs/cond-mat/0308065
Publikováno v:
Phys. Rev. Lett. 92, 047004 (2004)
We report a precise $^{59}$Co nuclear quadrupolar resonance (NQR) measurement on the recently discovered cobalt oxyhydrate Na$_{0.35}$CoO$_{2}$$\cdot y$H$_{2}$O superconductor from $T$=40 K down to 0.2 K. We find that in the normal state the spin-lat
Externí odkaz:
http://arxiv.org/abs/cond-mat/0307127
Publikováno v:
Phys. Rev. B 68, 132504 (2003)
The effect of hydrostatic pressure on the superconducting transition temperature of Na{0.35}CoO{2}.yH{2}O was investigated by ac susceptibility measurements up to 1.6 GPa. The pressure coefficient of T{c} is negative and the dependence T{c}(p) is non
Externí odkaz:
http://arxiv.org/abs/cond-mat/0304537
The macroscopic magnetizations of Ru_1-xCu_xSr_2EuCu_2O_8+d with x between 0 and 0.15 were investigated. A ferromagnet-like transition as well as an antiferromagnet-like transition appear around T_M in the low-field magnetization and around T_AM in t
Externí odkaz:
http://arxiv.org/abs/cond-mat/0304163