3,619 research outputs found
Media interventions and new social imaginaries
Recent re-articulations of the “social imaginary" (Castoriadis 1987) have emerged due to the proliferation and dispersion of new technologies in everyday life. What effect can enacting imaginative narratives for the near future have on present conditions? By reflecting upon two case studies in Serbia (2006) and Montenegro (2009), this paper considers the construction of narrative and spectacle as crafting of social imaginaries. Drawing on participatory, ethnographic and practice-based research methods, these interventions navigate economic and social change by connecting location-based situations with global media networks
The Role of Splayed Disorder and Channel Flow on the Dynamics of Driven 3D Vortices
We present the results of three-dimensional molecular dynamics simulations of
vortices which indicate that, for B greater than the matching field, the
enhanced pinning effectiveness of splayed columnar defects relative to vertical
columnar defects can be explained in terms of the existence or absence of
channels through which the vortices can flow without encountering defects.Comment: 2 Pages, 3 Figures, Proceedings from Houston M2S-HTSC-VI References
altered, minor correction
Role of Symmetry in Raman Spectroscopy of Unconventional Superconductors
The role of symmetry of the inelastic light scattering amplitude, the
superconducting energy gap, and the underlying Fermi surface manifold on the
Raman spectra of unconventional superconductors is discussed in detail.
Particular emphasis is placed on both single and bi-layer superconductors. It
is found that the channel may be the most sensitive to doping due to
the role of the Van Hove singularity. Lastly the effects of both disorder and
spin fluctuations are considered. The theory imposes strong constraints on both
the magnitude and symmetry of the energy gap for the bi-layer cuprates,
indicating that a nearly identical energy gap of symmetry
provides a best fit to the data.Comment: 12 pages, 4 postscript files, 1 tabl
Unconventional electronic Raman spectra of borocarbide superconductors
Borocarbide superconductors, which are thought to be conventional BCS-type
superconductors, are not so conventional in several electronic Raman
properties. Anisotropic gap-like features and finite scattering strength below
the gap were observed for the NiBC ( = Lu, Y) systems in our
previous study. The effects of Co-doping on the 2 gap-like features and
the finite scattering strength below and above the gap are studied in = Lu
(B = B) system. In superconducting states, Co-doping strongly suppresses
the 2 peak in both B and B symmetries. Raman
cross-section calculation which includes inelastic scattering shows a
relatively good fit to the features above the 2 peak, while it does not
fully account for the features below the peak.Comment: 2 pages, 1 figur
But I Don\u27t Teach Reading : An annotated Bibliography Focusing on Helping Educators of all Subjects Teach Reading
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Anionic and cationic redox and interfaces in batteries: Advances from soft X-ray absorption spectroscopy to resonant inelastic scattering
Recent advances in battery science and technology have triggered both the challenges and opportunities on studying the materials and interfaces in batteries. Here, we review the recent demonstrations of soft X-ray spectroscopy for studying the interfaces and electrode materials. The focus of this review is on the recently developed mapping of resonant inelastic X-ray scattering (mRIXS) as a powerful probe of battery chemistry with superior sensitivity. Six different channels of soft X-ray absorption spectroscopy (sXAS) are introduced for different experimental purposes. Although conventional sXAS channels remain effective tools for quantitative analysis of the transition-metal states and surface chemistry, we elaborate the limitations of sXAS in both cationic and anionic redox studies. Particularly, based on experimental findings in various electrodes, we show that sXAS is unreliable for studying oxygen redox. We then demonstrate the mRIXS as a reliable technique for fingerprinting oxygen redox and summarize several crucial observations. We conclude that mRIXS is the tool-of-choice to study both the practical issue on reversibility of oxygen redox and the fundamental nature of bulk oxygen states. We hope this review clarifies the popular misunderstanding on oxygen sXAS results of oxide electrodes, and establishes a reliable technique for detecting oxygen redox through mRIXS
Collective Spin Fluctuation Mode and Raman Scattering in Superconducting Cuprates
Although the low frequency electronic Raman response in the superconducting
state of the cuprates can be largely understood in terms of a d-wave energy
gap, a long standing problem has been an explanation for the spectra observed
in the polarization orientations. We present calculations which
suggest that the peak position of the observed spectra is due to a
collective spin fluctuation mode.Comment: 4 pages, 5 eps figure
Symmetry dependence of phonon lineshapes in superconductors with anisotropic gaps
The temperature dependence below of the lineshape of optical phonons
of different symmetry as seen in Raman scattering is investigated for
superconductors with anisotropic energy gaps. It is shown that the symmetry of
the electron-phonon vertex produces non-trivial couplings to an anisotropic
energy gap which leads to unique changes in the phonon lineshape for phonons of
different symmetry. The phonon lineshape is calculated in detail for
and phonons in a superconductor with pairing
symmetry. The role of satellite peaks generated by the electron-phonon coupling
are also addressed. The theory accounts for the substantial phonon narrowing of
the phonon, while narrowing of the phonon which is
indistinguishable from the normal state is shown, in agreement with recent
measurements on BSCCO.Comment: 15 pages (3 Figures available upon request), Revtex, 1
Raman Scattering in Cuprate Superconductors
A theory for electronic Raman scattering in the cuprate superconductors is
presented with a specific emphasis on the polarization dependence of the
spectra which can infer the symmetry of the energy gap. Signatures of the
effects of disorder on the low frequency and low temperature behavior of the
Raman spectra for different symmetry channels provide detailed information
about the magnitude and the phase of the energy gap. Properties of the theory
for finite T are discussed and compared to recent data concerning the doping
dependence of the Raman spectra in cuprate superconductors, and remaining
questions are addressed.Comment: 27 pages, 11 figures, style file include
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