Publications related to Magnetism and superconductivity of strongly correlated electrons on the triangular lattice

Slow magnetic fluctuations and superconductivity in fluorine-doped NdFeAsO

Janusz Andrzej Karpinski, Sergiy Katrych

Among the widely studied superconducting iron-pnictide compounds belonging to the Ln1111 family (with Ln a lanthanide), a systematic investigation of the crossover region between the superconducting and the antifer-romagnetic phase for the Ln = Nd case has ...

Amer Physical Soc2015

Asymmetry of collective excitations in electron- and hole-doped cuprate superconductors

Sandrine Gerber, Thorsten Schmitt, Gang Yu

High-temperature superconductivity emerges on doping holes or electrons into antiferromagnetic copper oxides. The large energy scale of magnetic excitations, for example, compared with phonon energies, is thought to drive superconductivity with high transi ...

2014

Anisotropic softening of magnetic excitations along the nodal direction in superconducting cuprates

Henrik Moodysson Rønnow, Marco Grioni, Thorsten Schmitt, Helmuth Berger, Marco Guarise, Bastien Dalla Piazza

The high-T-c cuprate superconductors are close to antiferromagnetic order. Recent measurements of magnetic excitations have reported an intriguing similarity to the spin wavesmagnons- of the antiferromagnetic insulating parent compounds, suggesting that ma ...

Nature Publishing Group2014

The Interplay Between Structural and Electronic Degrees of Freedom in Superconductors

Mathieu Julien Gino Cottet

More than one hundred years after the discovery of superconductivity in Leiden, the intriguing physics of several unconventional classes of superconductors continue to fascinate and challenge scientists from all over the world. The majority of these compou ...

EPFL2013

Band structure effects on the superconductivity in Hubbard models

Ronny Thomale

We study the influence of the band structure on the symmetry and superconducting transition temperature in the (solvable) weak-coupling limit of the repulsive Hubbard model. Among other results we find that (1) as a function of increasing nematicity, start ...

Amer Physical Soc2013

Correlations and renormalization of the electron-phonon coupling in the honeycomb Hubbard ladder and superconductivity in polyacene

Ronny Thomale

We have performed extensive density matrix renormalization group (DMRG) studies of the Hubbard model on a honeycomb ladder. The band structure (with Hubbard U = 0) exhibits an unusual quadratic band touching at half-filling, which is associated with a quan ...

Amer Physical Soc2013

Critical Resistance at the Superconductor-Insulator Transition in Hole-Doped Cuprates

Davor Pavuna, Guy Joseph Günter Dubuis, Ivan Bozovic

Here, we show that in several p-type cuprates, the superconductor-to-insulator transition (SIT) occurs at the critical sheet resistance approximately equal to the quantum resistance of pairs, RQ=h/4

e^{2}

=6.5 kΩ. In a relatively broad range of temperature ...

Springer Verlag2013

Thermopower as a Unique Tool to Probe Quantum Phase Transitions

Stevan Arsenijevic

In my thesis, transport measurements such as resistivity and, more importantly, thermopower S, were used to explore the phase diagram of bad metals. Bad metals are electronically correlated systems whose ground state lies close to a quantum phase transitio ...

EPFL2012

Direct observation of competition between superconductivity and charge density wave order in YBa2Cu3O6.67

Joël Mesot, Johan Juul Chang

Superconductivity often emerges in the proximity of, or in competition with, symmetry-breaking ground states such as antiferromagnetism or charge density waves(1-5) (CDW). A number of materials in the cuprate family, which includes the high transition-temp ...

Nature Publishing Group2012

Ultra Low Temperature Susceptometer and Magnetometer

Julian Piatek

The first part of this thesis discusses technical details relating to measurements of magnetic properties at ultra low temperatures. The implementation of AC susceptibility at temperatures down to 30 mK is introduced and used as a platform to showcase sele ...

EPFL2012

Magnetism and superconductivity of strongly correlated electrons on the triangular lattice

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Slow magnetic fluctuations and superconductivity in fluorine-doped NdFeAsO

Asymmetry of collective excitations in electron- and hole-doped cuprate superconductors

Anisotropic softening of magnetic excitations along the nodal direction in superconducting cuprates

The Interplay Between Structural and Electronic Degrees of Freedom in Superconductors

Band structure effects on the superconductivity in Hubbard models

Correlations and renormalization of the electron-phonon coupling in the honeycomb Hubbard ladder and superconductivity in polyacene

Critical Resistance at the Superconductor-Insulator Transition in Hole-Doped Cuprates

Thermopower as a Unique Tool to Probe Quantum Phase Transitions

Direct observation of competition between superconductivity and charge density wave order in YBa2Cu3O6.67

Ultra Low Temperature Susceptometer and Magnetometer

Slow magnetic fluctuations and superconductivity in fluorine-doped NdFeAsO

Correlations and renormalization of the electron-phonon coupling in the honeycomb Hubbard ladder and superconductivity in polyacene

Asymmetry of collective excitations in electron- and hole-doped cuprate superconductors

Direct observation of competition between superconductivity and charge density wave order in YBa2Cu3O6.67

Anisotropic softening of magnetic excitations along the nodal direction in superconducting cuprates

The Interplay Between Structural and Electronic Degrees of Freedom in Superconductors

Thermopower as a Unique Tool to Probe Quantum Phase Transitions

Ultra Low Temperature Susceptometer and Magnetometer

Band structure effects on the superconductivity in Hubbard models

Critical Resistance at the Superconductor-Insulator Transition in Hole-Doped Cuprates