Publications related to Normal state transport properties of novel superconductors

Competition between three-sublattice order and superfluidity in the quantum three-state Potts model of ultracold bosons and fermions on a square optical lattice

We study a quantum version of the three-state Potts model that includes as special cases the effective models of bosons and fermions on the square lattice in the Mott-insulating limit. It can be viewed as a model of quantum permutations with amplitudes J(p ...

2013

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

Electric field effect on superconductivity in $La_{2-x}$$Sr_{x}$$CuO_{4}$

Davor Pavuna, Guy Joseph Günter Dubuis, Ivan Bozovic

We demonstrate a method to tune the carrier concentration of a high temperature superconductor over a wide range, using an applied electric field. Thin film devices were made in an electrical double layer transistor configuration utilizing an ionic liquid. ...

American Institute of Physics2012

Magnetic hourglass dispersion and its relation to high-temperature superconductivity in iron-tuned Fe

Henrik Moodysson Rønnow, Bastien Dalla Piazza, Arash Alahgholipour Omrani, Nikolay Tsyrulin

High-temperature superconductivity remains arguably the greatest enigma of condensed matter physics. The discovery of iron-based high-temperature superconductors [1, 2] has renewed the importance of understanding superconductivity in materials susceptible ...

Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft2012

Unified one-band Hubbard model for magnetic and electronic spectra of the parent compounds of cuprate superconductors

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

Using low-energy projection of the one-band t-t′-t′′ Hubbard model we derive an effective spin Hamiltonian and its spin-wave expansion to order 1/S. We fit the spin-wave dispersion of several parent compounds to the high-temperature superconducting cuprate ...

American Physical Society2012

High-pressure flux growth, structural, and superconducting properties ofLnFeAsO (Ln=Pr, Nd, Sm) single crystals

Philip Johannes Walter Moll, Janusz Andrzej Karpinski, Sergiy Katrych

Single crystals of the LnFeAsO (Ln1111, Ln = Pr, Nd, and Sm) family with lateral dimensions up to 1 mm were grown from NaAs and KAs flux at high pressure. The crystals are of good structural quality and become superconducting when O is partially substitute ...

2012

Atomic-Layer Engineering of Oxide Superconductors

Davor Pavuna, Guy Joseph Günter Dubuis, Ivan Bozovic

Molecular beam epitaxy technique has enabled synthesis of atomically smooth thin films, multilayers, and superlattices of cuprates and other complex oxides. Such heterostructures show high temperature superconductivity and enable novel experiments that pro ...

2012

Spin excitations in a single La2CuO4 layer

Henrik Moodysson Rønnow, Thorsten Schmitt, Bastien Dalla Piazza, Ivan Bozovic

Cuprates and other high-temperature superconductors consist of two-dimensional layers that are crucial to their properties. The dynamics of the quantum spins in these layers lie at the heart of the mystery of the cuprates(1-7). In bulk cuprates such as La2 ...

Nature Publishing Group2012

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

Superconductor–insulator transition in La2 − xSrxCuO4 at the pair quantum resistance

Davor Pavuna, Guy Joseph Günter Dubuis, Ivan Bozovic

High-temperature superconductivity in copper oxides arises when a parent insulator compound is doped beyond some critical concentration; what exactly happens at this superconductor–insulator transition is a key open question1. The cleanest approach is to t ...

2011

Normal state transport properties of novel superconductors

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Competition between three-sublattice order and superfluidity in the quantum three-state Potts model of ultracold bosons and fermions on a square optical lattice

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

Electric field effect on superconductivity in $La_{2-x}$$Sr_{x}$$CuO_{4}$

Magnetic hourglass dispersion and its relation to high-temperature superconductivity in iron-tuned Fe

Unified one-band Hubbard model for magnetic and electronic spectra of the parent compounds of cuprate superconductors

High-pressure flux growth, structural, and superconducting properties ofLnFeAsO (Ln=Pr, Nd, Sm) single crystals

Atomic-Layer Engineering of Oxide Superconductors

Spin excitations in a single La2CuO4 layer

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

Superconductor–insulator transition in La2 − xSrxCuO4 at the pair quantum resistance

Superconductor–insulator transition in La2 − xSrxCuO4 at the pair quantum resistance

Magnetic hourglass dispersion and its relation to high-temperature superconductivity in iron-tuned Fe

High-pressure flux growth, structural, and superconducting properties ofLnFeAsO (Ln=Pr, Nd, Sm) single crystals

Electric field effect on superconductivity in $La_{2-x}$$Sr_{x}$$CuO_{4}$

Unified one-band Hubbard model for magnetic and electronic spectra of the parent compounds of cuprate superconductors

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

Competition between three-sublattice order and superfluidity in the quantum three-state Potts model of ultracold bosons and fermions on a square optical lattice

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

Atomic-Layer Engineering of Oxide Superconductors

Spin excitations in a single La2CuO4 layer