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Thermodynamic properties in the normal and superconducting states of Na(x)CoO(2)*yH(2)O powder measured by heat capacity experiments
B. Lorenz, J. Cmaidalka, R. L. Meng +1
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 th…
Raman Phonons and Ageing-Related Surface Disorder in NaxCoO2
M. N. Iliev, A. P. Litvinchuk, R. L. Meng +3
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 discusse…
Effect of Hydrostatic Pressure on the Superconductivity in NaxCoO2.yH2O
B. Lorenz, J. Cmaidalka, R. L. Meng +1
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 pres…
Thermodynamic Properties and Pressure Effect on the Superconductivity in CaAlSi and SrAlSi
B. Lorenz, J. Cmaidalka, R. L. Meng +1
Superconductivity in the C32 compounds CaAlSi and SrAlSi is investigated by heat capacity (Cp) measurements as well as high-pressure ac-susceptibility experiments. The heat capacit…