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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…
Superconductivity in pure and electron doped MgB2: Transport properties and pressure effects
B. Lorenz, Y. Y. Xue, R. L. Meng +1
The normal state and superconducting properties of MgB2 and Mg1-xAlxB2 are discussed based on structural, transport, and high pressure experiments. The positive Seebeck coefficient…
Hydrostatic Pressure Effect on the Superconducting Transition Temperature of MgB2
B. Lorenz, R. L. Meng, C. W. Chu
The pressure effect on the superconducting transition temperature of MgB2 has been determined using gas pressure up to 1 GPa. The transition temperature Tc was found to decrease li…
Absence of a Bulk Meissner State in RuSr2GdCu2O8
C. W. Chu, Y. Y. Xue, R. L. Meng +5
We have systematically investigated the magnetic, electrical, and structural properties of RuSr2GdCu2O8, in which a long-range ferromagnetic order and superconductivity have been p…