Renner<i>et al.</i>Reply:

Renner, Christoph; Revaz, B.; Genoud, Jean-Yves; Kadowaki, K.; Fischer, Ø.

doi:10.1103/physrevlett.82.3726

Cited by 34 publications

(78 citation statements)

References 7 publications

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“…If attending to uncertainties reported in the careful and independent investigations performed most recently in [24][25][26], the average energy needed for an α-particle to produce a photon around this band, for electric fields high enough to suppress charge recombination, is nowadays known to a precision of around one eV in the region 1-10 bar: W sc = 35.0±1.2 eV. Although uncertainties in W sc for X-ray and electron excitation have been historically reported to be considerably larger, in the range 60-110 eV [27][28][29][30], recent studies point to values compatible with the ones measured for α particles [31]. Furthermore, state of the art calculations of the seed states stemming from X-ray and MeV-electron excitation [32], once coupled to a microscopic description of the atomic/excimer cascade, can reproduce the main features of the scintillation spectrum of weakly quenched xenon mixtures [33], providing W sc = 39 ± 1 eV in the pressure range 1-10 bar.…”

Section: Introductionmentioning

confidence: 99%

Time and band-resolved scintillation in time projection chambers based on gaseous xenon

et al. 2022

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We present a systematic study of the time and band-resolved scintillation in xenon-based time projection chambers (TPCs), performed simultaneously for the primary (S1) and secondary (S2) components in a small, purity-controlled, setup. We explore a range of conditions of general academic interest, focusing on those of relevance to contemporary TPCs: pressure range 1–10 bar, pressure-reduced electric fields of 0–100 V/cm/bar in the drift region (S1) and up to the proportional scintillation regime in the multiplication region (S2), and wavelength bands 145–250/250–400/400–600 nm, for both $$\alpha $$ α and $$\beta $$ β particles. Attention is paid to the possibility of non-conventional scintillation mechanisms such as the 3rd continuum emission, recombination light from $$\beta $$ β -electrons at high pressure (for S1), emission from high-lying excited states and neutral bremsstrahlung (for S2). Time constants and, specially, scintillation yields have been obtained as a function of electric field and pressure, the latter aided by Geant4 simulations.

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Section: Introductionmentioning

confidence: 99%

Time and band-resolved scintillation in time projection chambers based on gaseous xenon

et al. 2022

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“…An alternative perspective on weak and strong pseudogap behavior comes from ARPES [22,23] and tunneling experiments [24] , which focus directly on single particle excitations. Above T * , ARPES experiments show that the spectral density of quasiparticles located near the (π, 0) part of the Brillouin zone, develops a high energy feature, a result which suggests that the transfer of spectral weight from low energies to high energies for part of the quasiparticle spectrum may be the physical origin of the weak pseudogap behavior seen in NMR experiments.…”

Section: Introductionmentioning

confidence: 99%

Microscopic theory of weak pseudogap behavior in the underdoped cuprate superconductors: General theory and quasiparticle properties

1999

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We use a novel solution of the spin fermion model which is valid in the quasi-static limit πT ≫ ω sf , found in the intermediate (pseudoscaling) regime of the magnetic phase diagram of cuprate superconductors, to obtain results for the temperature and doping dependence of the single particle spectral density, the electron-spin fluctuation vertex function, and the low frequency dynamical spin susceptibility. The resulting strong anisotropy of the spectral density and the vertex function lead to the qualitatively different behavior of hot (around k = (π, 0)) and cold (around k = (π/2, π/2)) quasiparticles seen in ARPES experiments. We find that the broad high energy features found in ARPES measurements of the spectral density of the underdoped cuprate superconductors are determined by strong antiferromagnetic (AF) correlations and incoherent precursor effects of an SDW state, with reduced renormalized effective coupling constant. Due to this transfer of spectral weight to higher energies, the low frequency spectral weight of hot states is strongly reduced but couples very strongly to the spin excitations of the system. For realistic values of the antiferromagnetic correlation length, their Fermi surface changes its general shape only slightly but the strong scattering of hot states makes the Fermi surface crossing invisible above a pseudogap temperature T * . The electron spin-fluctuation vertex function, i.e. the effective interaction of low energy quasiparticles and spin degrees of freedom, is found to be strongly anisotropic and enhanced for hot quasiparticles; the corresponding charge-fluctuation vertex is considerably diminished. We thus demonstrate that, once established, strong AF correlations act to reduce substantially the effective electron-phonon coupling constant in cuprate superconductors. 75.25.Dw,74.25.Ha

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“…Covellite is a 2D material with a very good cleavage parallel to the basal plane and atomic resolution have been achieved by Scanning Tunnelling Microscopy/ Spectroscopy (STM/STS) at room temperature (Rosso & Hochella, 1999). Due to the low T c , STS experiments could be conducted using the same methodology as Renner et al (1998) on cuprates: a sweep in temperature well above and well below T c in order to check for a pseudo-gap above T c , as suggested by NMR experiments (Gainov et al, 2009). These experiments will also check for the f-wave symmetry claimed by Mazin (2012).…”

Section: Discussionmentioning

confidence: 99%

The bond valence model as a prospective approach: examination of the crystal structures of copper chalcogenides with Cu bond valence excess

Moëlo¹,

Popa²,

Dubost³

2022

Acta Crystallogr B Struct Sci Cryst Eng Mater

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Bond valence analysis has been applied to various copper chalcogenides with copper valence excess, i.e. where the formal valence of copper exceeds 1. This approach always reveals a copper bond valence excess relative to the unit value, correlated to an equivalent ligand bond valence deficit. In stoichiometric chalcogenides, this corresponds to one ligand electron in excess per formula unit relative to the valence equilibrium considering only CuI. This ligand electron in excess is 50/50 shared between all or part of the Cu-atom positions, and all or part of the ligand-atom positions. In Cu3Se2, only one of the two Cu positions is involved in this sharing. It would indicate a special type of multicentre bonding (`one-electron co-operative bonding'). Calculated and ideal structural formulae according to this bond valence distribution are presented. At the crystal structure scale, Cu–ligand bonds implying the single electron in excess form one-, two- or three-dimensional subnetworks. Bond valence distribution according to two two-dimensional subnets is detailed in covellite, CuS. This bond valence description is a formal crystal–chemical representation of the metallic conductivity of holes (mixing between Cu 3d bands and ligand p bands), according to published electronic band structures. Bond valence analysis is a useful and very simple prospective approach in the search for new compounds with targeted specific physical properties.

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Renneret al.Reply:

Cited by 34 publications

References 7 publications

Time and band-resolved scintillation in time projection chambers based on gaseous xenon

Time and band-resolved scintillation in time projection chambers based on gaseous xenon

Microscopic theory of weak pseudogap behavior in the underdoped cuprate superconductors: General theory and quasiparticle properties

The bond valence model as a prospective approach: examination of the crystal structures of copper chalcogenides with Cu bond valence excess

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