245 citations · 270 across the 7 of their papers we have counts for
7 papers
High-Resolution Thermal Expansion of MgB2
R. Lortz, C. Meingast, D. Ernst +3
The thermal expansion of polycrystalline MgB2 from 5-300 K is studied using high-resolution capacitance dilatometry. The thermal expansivity exhibits a small jump of -5.8x10-8 K-1…
The oxygen isotope effect in the ab-plane reflectance of underdoped YBa_2Cu_3O_{7-delta}
N. L. Wang, T. Timusk, J. P. Franck +3
We have measured the effect of oxygen isotope substitution on the ab-plane reflectance of underdoped YBCO. The frequency shift of the transverse optic phonons due to the substituti…
Evidence for Two Superconducting Gaps in
X. K. Chen, M. J. Konstantinovic, J. C. Irwin +2
We have measured the Raman spectra of polycrystalline MgB from 25 {\cm} to 1200 {\cm}. When the temperature was decreased below the superconducting transition temperature $T_…
Experimental fitting to the bipolaronic model of the normal-state resistance of Bi_2Sr_2CaCu_2O_8 single crystals
Weimin Chen, J. P. Franck, J. Jung
Normal-state resistance data from Bi_2Sr_2CaCu_2O_8 single crystals were fitted to the (bi)polaronic conduction model, , with satisfactory agreement over…
Various regimes of flux motion in BiSrCaCuO single crystals
Weimin Chen, J. P. Franck, J. Jung
Four regimes of vortex motion were identified in the magnetoresistance of BiSrCaCuO single crystals: (1) thermally activated flux flow (TAFF) in samples with su…
Observation of a Universial Low Temperature Limit of the Free Flux Flow Resistivity in Superclean Bi_2Sr_2CaCu_2O_8 Whiskers
Weimin Chen, J. P. Franck, J. Jung
We report peculiar vortex motion in clean BiSrCaCuO single crystals, which reveals nearly linear- resistivity tails extending to low temperatures. The resistivit…