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Energy-scale phenomenology and pairing via resonant spin-charge motion in FeAs, CuO, heavy-fermion and other exotic superconductors | | Y. J. Uemura
; | | Date: |
10 Nov 2008 | | Abstract: | Muon spin relaxation ($mu$SR) studies of the "1111" and "122" FeAs systems
have detected static magnetism with variably sized ordered moments in their
parent compounds. Phase diagrams of FeAs, CuO, organic BEDT, A$_{3}$C$_{60}$
and heavy-fermion systems indicate competition between static magnetism and
superconductivity. In both FeAs and CuO systems, the superfluid density
$n_{s}/m^{*}$ at $T o 0$ exhibits a nearly linear scaling with $T_{c}$.
Analogous to the roton minimum energy scaling with the lambda transition
temperature in superfluid $^{4}$He, clear scaling with $T_{c}$ was also found
for the energy of the magnetic resonance mode in cuprates,
(Ba,K)Fe$_{2}$As$_{2}$, CeCoIn$_{5}$ and CeCu$_{2}$Si$_{2}$, as well as the
energy of the superconducting coherence peak observed by angle resolved photo
emission (ARPES) in the cuprates near ($pi$,0). Both the superfluid density
and the energy of these pair-non-breaking soft-mode excitations determine
superconducting $T_{c}$ via phase fluctuations of condensed bosons. Combining
these observations and common dispersion relations of spin and charge
collective excitations in the cuprates, we propose a resonant spin charge
motion/coupling, "traffic-light resonance," expected when the charge energy
scale $epsilon_{F}$ becomes comparable to the spin fluctuation energy scale
$hbaromega_{SF}sim J$, as the process which leads to pair formation in these
correlated electron superconductors. | | Source: | arXiv, 0811.1546 | | Services: | Forum | Review | PDF | Favorites | |
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