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24 papers · 1 filter
Cu(2) nuclear resonance evidence for an original magnetic phase in aged 60K-superconductors RBa2Cu3O6+x (R=Tm,Y)
A. V. Dooglav, H. Alloul, O. N. Bakharev +7
It is widely believed that the long-range antiferromagnetic order in the RBa2Cu3O6+x compounds (R=Y and rare earths except of Ce, Pr, Tb) is totally suppressed for the oxygen index…
Boundary conditions at the mobility edge
D. Braun, G. Montambaux, M. Pascaud
It is shown that the universal behavior of the spacing distribution of nearest energy levels at the metal--insulator Anderson transition is indeed dependent on the boundary conditi…
Sign Reversals of ac Magnetoconductance in Isolated Quantum Dots
Yves Noat, Helene Bouchiat, Bertrand Reulet +1
We have measured the electromagnetic response of micron-size isolated mesoscopic GaAs/GaAlAs square dots down to temperature T=16mK, by coupling them to an electromagnetic micro-re…
Conductivity and Atomic Structure of Isolated Multiwalled Carbon Nanotubes
A. Yu. Kasumov, H. Bouchiat, B. Reulet +4
We report associated high resolution transmission electron microscopy (HRTEM) and transport measurements on a series of isolated multiwalled carbon nanotubes. HRTEM observations, b…
Hole doping and disorder effects on the one-dimensional Kondo lattice, for ferromagnetic Kondo couplings
K. Le Hur
We investigate the one-dimensional Kondo lattice model (1D KLM) for ferromagnetic Kondo couplings. The so-called ferromagnetic 2-leg spin ladder and the S=1 antiferromagnet occur a…
Absence of spin gap in the superconducting ladder compound Sr_2Ca_{12}Cu_{24}O_{41}
H. Mayaffre, P. Auban-Senzier, D. Jérome +5
Transport and 63^Cu-NMR, Knight shift and T_1, measurements performed on the two-leg spin ladders of Sr_2Ca_{12}Cu_{24}O_{41} single crystals show a collapse of the gap in ladder s…