K. Conder
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View article: Oxygen isotope effect on the superfluid density within the d-wave and s-wave pairing channels of YBa₂Cu₄O₈
Oxygen isotope effect on the superfluid density within the d-wave and s-wave pairing channels of YBa₂Cu₄O₈ Open
We report on measurements of the oxygen isotope ($^{16}$O/$^{18}$O) effect (OIE) on the transition temperature $T_{\rm c}$ and the zero-temperature in-plane magnetic penetration depth $λ_{\rm ab}(0)$ in the stoichiometric cuprate supercond…
View article: Material aspects of oxygen isotope effect studies in high-temperature superconductors
Material aspects of oxygen isotope effect studies in high-temperature superconductors Open
The article discusses issues related to the material aspects of the study of the oxygen isotope effect in High-temperature superconductors. These studies were initiated by Prof. K.A. Müller shortly after he and Dr. G. Bednorz discovered hi…
View article: NMR Study under Pressure on Highly Ca-doped Spin-ladder Compound Sr<sub>1.4</sub>Ca<sub>12.6</sub>Cu<sub>24</sub>O<sub>41</sub>
NMR Study under Pressure on Highly Ca-doped Spin-ladder Compound Sr<sub>1.4</sub>Ca<sub>12.6</sub>Cu<sub>24</sub>O<sub>41</sub> Open
We performed 63Cu-NMR measurements for a spin-ladder compound Sr1.4Ca12.6Cu24O41. The highly Ca-doped single crystals show a distorted superconducting phase in the P-T phase diagram and the 1D like feature is expected to appear in the lowe…
View article: A quantum magnetic analogue to the critical point of water
A quantum magnetic analogue to the critical point of water Open
Specific heat data for SrCu2(BO3)2 with pressure and magnetic fields and iPEPS results for specific heat, correlation length and dimer correlations
View article: A quantum magnetic analogue to the critical point of water
A quantum magnetic analogue to the critical point of water Open
Specific heat data for SrCu2(BO3)2 with pressure and magnetic fields and iPEPS results for specific heat, correlation length and dimer correlations
View article: Unconventional Transport Properties of Reduced Tungsten Oxide WO2.9
Unconventional Transport Properties of Reduced Tungsten Oxide WO2.9 Open
The temperature and magnetic field dependence of resistivity in WO2.9 was investigated. The variation of resistivity with temperature displayed unusual features, such as a broad maximum around 230 K and a logarithmic increase of resistivit…
View article: A quantum magnetic analogue to the critical point of water
A quantum magnetic analogue to the critical point of water Open
At the familiar liquid-gas phase transition in water, the density jumps discontinuously at atmospheric pressure, but the line of these first-order transitions defined by increasing pressures terminates at the critical point [1], a concept …
View article: A Retrospective of Materials Synthesis at the Paul Scherrer Institut (PSI)
A Retrospective of Materials Synthesis at the Paul Scherrer Institut (PSI) Open
The availability of high-quality and well characterized materials is a key factor for condensed-matter research [...]
View article: Imaging the local electronic and magnetic properties of intrinsically phase separated Rb<sub> <i>x</i> </sub>Fe<sub>2–<i>y</i> </sub>Se<sub>2</sub> superconductor using scanning microscopy techniques
Imaging the local electronic and magnetic properties of intrinsically phase separated Rb<sub> <i>x</i> </sub>Fe<sub>2–<i>y</i> </sub>Se<sub>2</sub> superconductor using scanning microscopy techniques Open
The discovery in 2008 of the iron-based superconducting pnictide and chalcogenide compounds has provided an entirely new family of materials for studying the crucial interplay between superconductivity and magnetism in unconventional super…
View article: Complementary Response of Static Spin-Stripe Order and Superconductivity to Nonmagnetic Impurities in Cuprates
Complementary Response of Static Spin-Stripe Order and Superconductivity to Nonmagnetic Impurities in Cuprates Open
We report muon-spin rotation and neutron-scattering experiments on nonmagnetic Zn impurity effects on the static spin-stripe order and superconductivity of the La214 cuprates. Remarkably, it was found that, for samples with hole doping x≈1…
View article: Distinct Evolutions of Weyl Fermion Quasiparticles and Fermi Arcs with Bulk Band Topology in Weyl Semimetals
Distinct Evolutions of Weyl Fermion Quasiparticles and Fermi Arcs with Bulk Band Topology in Weyl Semimetals Open
The Weyl semimetal phase is a recently discovered topological quantum state of matter characterized by the presence of topologically protected degeneracies near the Fermi level. These degeneracies are the source of exotic phenomena, includ…
View article: Distinct evolutions of Weyl fermion quasiparticles and Fermi arcs with bulk band topology in Weyl semimetals
Distinct evolutions of Weyl fermion quasiparticles and Fermi arcs with bulk band topology in Weyl semimetals Open
The Weyl semimetal phase is a recently discovered topological quantum state of matter characterized by the presence of topologically protected degeneracies near the Fermi level. These degeneracies are the source of exotic phenomena, includ…
View article: Global formation of topological defects in the multiferroic hexagonal manganites
Global formation of topological defects in the multiferroic hexagonal manganites Open
The spontaneous transformations associated with symmetry-breaking phase transitions generate domain structures and defects that may be topological in nature. The formation of these defects can be described according to the Kibble-Zurek mec…
View article: Phase separation in iron chalcogenide superconductor Rb0.8+xFe1.6+ySe2 as seen by Raman light scattering and band structure calculations
Phase separation in iron chalcogenide superconductor Rb0.8+xFe1.6+ySe2 as seen by Raman light scattering and band structure calculations Open
We report Raman light scattering in the phase separated superconducting single crystal Rb0.77Fe1.61Se2 with Tc = 32 K over a wide temperature region 3–500 K. The observed phonon lines from the majority vacancy ordered Rb2Fe4Se5 (245) antif…
View article: Novel Synthesis Method of Nonstoichiometric Na2-xIrO3 Crystal Structure, Transport and Magnetic Properties
Novel Synthesis Method of Nonstoichiometric Na2-xIrO3 Crystal Structure, Transport and Magnetic Properties Open
Transition metal oxides with 4d or 5d metals are of great interest due to the competing interactions, of the Coulomb repulsion and the itineracy of the d-electrons, opening a possibility of building new quantum ground states. Particularly …
View article: Discovery of Weyl semimetal state violating Lorentz invariance in MoTe2
Discovery of Weyl semimetal state violating Lorentz invariance in MoTe2 Open
A new type of Weyl semimetal state, in which the energy values of Weyl nodes are not the local extrema, has been theoretically proposed recently, namely type II Weyl semimetal. Distinguished from type I semimetal (e.g. TaAs), the Fermi sur…
View article: Evidence for monoclinic distortion in the ground state phase of underdoped La1.95Sr0.05CuO4: A single crystal neutron diffraction study
Evidence for monoclinic distortion in the ground state phase of underdoped La1.95Sr0.05CuO4: A single crystal neutron diffraction study Open
The existing controversy about the symmetry of the crystal structure of the ground state of the critical doped La1.95Sr0.05CuO4 has been resolved by analyzing the single crystal neutron diffraction data collected between 5 and 730 K. We ob…
View article: Magnetic properties of Mn-doped Bi$_2$Se$_3$ compound: temperature dependence and pressure effects
Magnetic properties of Mn-doped Bi$_2$Se$_3$ compound: temperature dependence and pressure effects Open
Magnetic susceptibility $χ$ of Bi$_{2-x}$Mn$_{x}$Se$_3$ ($x = 0.01-0.2$) was measured in the temperature range $4.2-300$ K. For all the samples, a Curie-Weiss behaviour of $χ(T)$ was revealed with effective magnetic moments of Mn ions corr…
View article: New Synthesis Route and Magnetic Structure of Tm<sub>2</sub>Mn<sub>2</sub>O<sub>7</sub> Pyrochlore
New Synthesis Route and Magnetic Structure of Tm<sub>2</sub>Mn<sub>2</sub>O<sub>7</sub> Pyrochlore Open
In this work, we present a new chemical route to synthesize Tm2Mn2O7 pyrochlore, which a compound that is thermodynamically unstable at ambient pressure. Differently from the reported in the past high-pressure synthesis of the same compoun…
View article: Probing the electron-phonon interaction in correlated systems with coherent lattice fluctuation spectroscopy
Probing the electron-phonon interaction in correlated systems with coherent lattice fluctuation spectroscopy Open
Tailoring the properties of correlated oxides is accomplished by chemical doping, pressure, temperature, or magnetic field. Photoexcitation is a valid alternative to reach out-of-equilibrium states otherwise inaccessible. Here, we quantita…