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Exceeding the Pauli limit
par - 20 septembre 2006
Superconducting doped ladders under a magnetic field parallel to their plane reveal interesting novel phases and phenomena, including irrational magnetization plateaus and exceeding of the Pauli limit, as was shown recently by members of the Laboratory in collaboration with Steve White (UC Irvine).
The magnetization curve displays two plateaus, one with 
and one
with 
, where 
is the hole density. These plateaus
are typical effects of strong interactions between electrons and
mostly found in low-dimensional strongly-correlated systems. In this
particular case, the magnetization plateau with has a value
controlled by doping and thus is irrational contrary to undoped
systems for which rational values only are expected. This plateau
phenomenologically originates from an energetic stabilization of
holes with polarized electrons.
Furthermore, the superconducting critical field 
of the system is
found to be much larger than the Pauli limit
. Such a surprising exceeding of this limit can be
explained by the existence of a wide Fulde-Ferrel-Larkin-Ovchinnikov
(FFLO) phase. Lastly, non-polarized triplet correlations emerge at
high magnetic field : a signature of the modification of the magnetic
fluctuations which occur under magnetic field.
The corresponding paper, Zeeman Effect in Superconducting Two-Leg Ladders : Irrational Magnetization Plateaus and Exceeding the Pauli Limit has been published in Physical Review Letters 97, 087207 (2006). The corresponding author in the laboratory is Guillaume Roux
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