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20 results on '"VANACKEN, J."'

1. Evidence of multiband behavior in the superconducting alloy Zr0.96V0.04B2

Author

Renosto, ST, Consoline, H, dos Santos, CAM, Aguiar, J Albino, Jung, Soon-Gil, Vanacken, J, Moshchalkov, VV, Fisk, Z, and Machado, AJS

Subjects
Physical Sciences, Chemical Sciences, Engineering, Fluids & Plasmas
Abstract

ZrB2 is a nonsuperconducting Pauli paramagnetic crystallizing in the AlB2 structure. V substitution for Zr in Zr1-xV xB2 (0.01 ≤ x ≤ 0.1) at the few percentage level induces superconductivity with critical temperature reaching a maximum of 8.7 K for Zr0.96V0.04B2 near the solid solubility limit. Specific-heat and lower critical field temperature dependence results suggest the possibility of unconventional superconductivity possibly arising from multiband effects. © 2013 American Physical Society.

Published
2013

17. Magnetic phase diagram of the spin-Peierls compoundCuGeO3doped with Al and Sn

Author

Demishev, S. V., primary, Weckhuysen, L., additional, Vanacken, J., additional, Trappeniers, L., additional, Herlach, F., additional, Bruynseraede, Y., additional, Moshchalkov, V. V., additional, Pronin, A. A., additional, Sluchanko, N. E., additional, Samarin, N. A., additional, Meersschaut, J., additional, and Leonyuk, L. I., additional

Published
1998
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20. Exciton confinement in strain-engineered metamorphic InAs/InxGa1-xAs quantum dots.

Author

Khattak, S. A., Hayne, M., Huang, J., Vanacken, J., Moshchalkov, V. V., Seravalli, L., Trevisi, G., and Frigeri, P.

Subjects
*QUANTUM dots, *METAMORPHIC rocks, *LATTICE constants, *DIAMAGNETIC materials, *SPILLOVER (Chemistry)
Abstract

We report a comprehensive study of exciton confinement in self-assembled InAs quantum dots (QDs) in strain-engineered metamorphic InxGa1-xAs confining layers on GaAs using low-temperature magnetophotoluminescence. As the lattice mismatch (strain) between QDs and confining layers (CLs) increases from 4.8% to 5.7% the reduced mass of the exciton increases, but saturates at higher mismatches. At low QD-CL mismatch there is clear evidence of spillover of the exciton wave function due to small localization energies. This is suppressed as the In content x in the CLs decreases (mismatch and localization energy increasing). The combined effects of low effective mass and wave-function spillover at high x result in a diamagnetic shift coefficient that is an order of magnitude larger than for samples where In content in the barrier is low (mismatch is high and localization energy is large). Finally, an anomalously small measured Bohr radius in samples with the highest x is attributed to a combination of thermalization due to low localization energy, and its enhancement with magnetic field, a mechanism which results in small dots in the ensemble dominating the measured Bohr radius. [ABSTRACT FROM AUTHOR]

Published
2017
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