494 citations
- The University of TokyoJP18 papers
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18 papers · 1 filter
Carbon-substitution effect on the electronic properties of MgB single crystals
T. Masui, S. Lee, S. Tajima
The electronic properties of the carbon substituted MgB single crystals are reported. The carbon substitution drops T below 2 K. In-plane resistivity shows a remarkable inc…
Enhancement of the irreversibility field by carbon substitution in single crystal MgB
E. Ohmichi, T. Masui, S. Lee +2
We report the detailed study of the irreversibility field {\hirr} of single crystals of Mg(BC) (=0, 2, 3.5, 5 and 7%) in strong magnetic fields of up to 40 T.…
The vortex depinning transition in untwinned YBaCuO using complex impedance measurements
Alain Pautrat, Christophe Goupil, Charles Simon +3
We present surface impedance measurement of the vortex linear response in a large untwinned YBCO crystal. The depinning spectra obtained over a broad frequency range (100 Hz- 30 MH…
Kohn Anomaly in MgB2 by Inelastic X-Ray Scattering
A. Q. R. Baron, H. Uchiyama, Y. Tanaka +7
We study phonons in MgB2 using inelastic x-ray scattering (1.6 and 6 meV resolution). Our measurements show excellent agreement with theory for the dispersion and line-width: we cl…
Raman study of carrier-overdoping effects on the gap in high-Tc superconducting cuprates
T. Masui, M. Limonov, H. Uchiyama +3
Raman scattering in the heavily overdoped (Y,Ca)Ba_2Cu_3O_{7-d} (T_c = 65 K) and Bi_2Sr_2CaCu_2O_{8+d} (T_c = 55 K) crystals has been investigated. For the both crystals, the elect…
Electronic Structure of B-2 and States in MgB, AlB and ZrB Single Crystals
J. Nakamura, S. Nasubida, E. Kabasawa +18
The effect of electron correlation (EC) on the electronic structure in MgB, AlB and ZrB, is studied by examining the partial density of states (PDOS) of B-2 and $pπ…