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Atmospheric Mars Entry and Landing Investigations & Analysis (AMELIA) by ExoMars 2016 Schiaparelli Entry Descent Module
Three energy scales in the superconducting state of hole-doped cuprates detected by electronic Raman scattering
We explored by electronic Raman scattering the superconducting state of
Bi-2212 single crystal by performing a fine tuned doping study. We found three
distinct energy scales in A1g, B1g and B2g symmetries which show three distinct
doping dependencies. Above p=0.22 the three energies merge, below p=0.12, the
A1g scale is no more detectable while the B1g and B2g scales become constant in
energy. In between, the A1g and B1g scales increase monotonically with
under-doping while the B2g one exhibits a maximum at p=0.16. The three
superconducting energy scales appear to be an universal feature of hole-doped
cuprates. We propose that the non trivial doping dependence of the three scales
originates from Fermi surface topology changes and reveals competing orders
inside the superconducting dome.Comment: 6 pages, 5 figure
Incommensurate spin density wave in Co-doped BaFe2As2
57Fe Mossbauer spectroscopy measurements are presented in the underdoped
Ba(Fe{1-x}Cox)2As2 series for x=0.014 (T_c < 1.4K) and x=0.03 and 0.045 (T_c ~
2 and 12K respectively). The spectral shapes in the so-called spin-density wave
(SDW) phase are interpreted in terms of incommensurate modulation of the
magnetic structure, and allow the shape of the modulation to be determined. In
undoped BaFe2As2, the magnetic structure is commensurate, and we find that
incommensurability is present at the lowest doping level (x=0.014). As Co
doping increases, the low temperature modulation progressively loses its
"squaredness" and tends to a sine-wave. The same trend occurs for a given
doping level, as temperature increases. We find that a magnetic hyperfine
component persists far above the SDW transition, its intensity being
progressively tranferred to a paramagnetic component on heating.Comment: 7 pages, 8 figures, published in EP
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