24 Result(s)
within
D. Van Der Marel
English
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Article
Open AccessPropagation of shear stress in strongly interacting metallic Fermi liquids enhances transmission of terahertz radiation
A highlight of Fermi-liquid phenomenology, as explored in neutral \(^3\) ...
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Article
Unconventional free charge in the correlated semimetal Nd2Ir2O7
Nd2Ir2O7 is a correlated semimetal with the pyrochlore structure, in which competing spin–orbit coupling and electron–electron interactions are believed to induce a time-reversal symmetry-broken Weyl semimetal ph...
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Article
Multiband Superconductivity Due to the Electron–LO–Phonon Interaction in Strontium Titanate and on a SrTiO3/LaAlO3 Interface
In strontium titanate, the Fröhlich electron – LO-phonon interaction dominates the electron response and can also provide superconductivity. Because of high LO-phonon frequencies in SrTiO3, the superconducting sy...
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Article
Open AccessIsotope effect in superconducting n-doped SrTiO3
We report the influence on the superconducting critical temperature Tc in doped SrTiO3 of the substitution of the natural 16O atoms by the heavier isotope 18O. We observe that for a wide range of do** this subs...
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Article
Open AccessPhoto-enhanced antinodal conductivity in the pseudogap state of high-Tc cuprates
A major challenge in understanding the cuprate superconductors is to clarify the nature of the fundamental electronic correlations that lead to the pseudogap phenomenon. Here we use ultrashort light pulses to ...
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Article
Optical Spectroscopy of Plasmons and Excitons in Cuprate Superconductors
An introduction is given to collective modes in layered, Josephson coupled high T c superconductors. An experimental demonstration is treated of the mechanism proposed by Anders...
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Chapter
Optical signatures of electron correlations in the cuprates
The f-sum rule is introduced and its applications to electronic and vibrational modes are discussed. A related integral over the intra-band part of σ(ω) which is also valid for correlated electrons, becomes just ...
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Article
Quantum critical behaviour in a high-Tc superconductor
Quantum criticality is associated with a system composed of a nearly infinite number of interacting quantum degrees of freedom at zero temperature, and it implies that the system looks on average the same rega...
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Chapter
Superconductivity by Kinetic Energy Saving?
A brief introduction is given in the generic microscopic framework of superconductivity. The consequences for the temperature dependence of the kinetic energy, and the correlation energy are discussed for two ...
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Article
Charge and Sodium Ordering in β-Na0.33V2O3
Polarized Raman and optical spectra for the quasi one-dimensional metallic vanadate β-Na0.33V2O3 are reported for various temperatures. The spectra are discussed in the light of the sodium and charge ordering tra...
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Article
Optical measurements of the superconducting gap in MgB 2
Far-infrared reflectivity studies on the polycrystalline intermetallic compound MgB2 with a superconducting transition temperature T c = 39 K were performed at temperatures 20...
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Chapter and Conference Paper
C-Axis Infrared Spectra of Bilayer High-Tc Cuprates: The Effect of Intrabilayer Josephson Coupling
The c-axis optical spectra of single crystals of YBa2(Cu1-xRx)3O6.6, R=Ni and Zn, and Bi2Sr2CaCu2O8+δ have been measured at temperatures between 7 and 300 K. The complex conductivity shows several interesting fea...
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Article
Origin of Anomalous Bump at Low Temperatures in the c-Axis Optical Conductivity of High-T c Cuprates
The optical spectra of some high-Tc cuprates show anomalous bump around 450 cm −1 and dramatic phonon changes for E parallel to c axis, which grows at low temperatures. This phenomenon has been observed in Yba 2
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Article
Global and local measures of the intrinsic Josephson coupling in Tl2Ba2CuO6 as a test of the interlayer tunnelling model
One leading candidate theory of high-temperature superconductivity in the copper oxide systems is the interlayer tunnelling (ILT) mechanism1. In this model, superconductivity is created by tunnelling of electron ...
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Article
Anomalous millimeter-wave absorption in the superconducting phase of La2−x SrxCuO4
Direct measurements of the complex conductivity spectra of thin-film La2−2x SrxCuO4 are made at frequencies of 5–40 cm−1. Narrow, intense Drude-type excitation is observed in the superconducting phase.
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Article
Far- and mid-infrared spectrum of YBa2Cu3O6.0 in high magnetic fields
The far- and mid-infrared spectrum of antiferromagnetic YBa2Cu3O6.0 was investigated by infrared transmission measurements (→k∥c-axis) in high magnetic fields up to 16.5Tesla at T=1K. A peak at 1436cm −1 which pr...
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Article
Transverse optical plasmons in layered superconductors
We discuss the possible existance of transverse optical plasma modes in superlattices consisting of Josephson coupled superconducting layers. These modes appear as resonances in the current-current correlation...
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Article
Probing the mid-infrared spectrum of YBa2Cu3O6.0 with high magnetic fields and Zink do**
The mid-infrared phonon and spin-wave spectrum of antiferromagnetic YBa2Cu3O6.0 was investigated by infrared transmission measurements (k →‖c-axis) atT=4K. Peaks at 178 meV, 346 meV and 470 meV we...
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Article
c-Acis excitations in high-Tc superconductors detected by grazing incidence reflectivity measurements
Measuring absolute reflectivity at an angle of incidence of 80° for Tl2Ba2CuO6, Bi2Sr2CuO6, Nd1.85Ce0.15CuO4 with p-polarized light (plane of incidence normal to the CuO2-planes), we were able to extract the c-ax...
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Article
The plasmon density of states of a layered electron gas
The plasmon density of states (DOS)p(ω) of a layered electron gas (LEG) is studied theoretically. It is shown thatp(ω) is a linear function of frequency ω as ω goes to 0, and then increases more rapidly as ω tend...
