John Collini
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View article: Enhancement of Superconductivity in WP via Oxide-Assisted Chemical Vapor Transport
Enhancement of Superconductivity in WP via Oxide-Assisted Chemical Vapor Transport Open
Tungsten monophosphide (WP) has been reported to superconduct below 0.8 K, and theoretical work has predicted an unconventional Cooper pairing mechanism. Here we present data for WP single crystals grown by means of chemical vapor transpor…
View article: Giant nematic response of the incommensurate charge density wave in the nickel-pnictide Ba$_{1-x}$Sr$_x$Ni$_2$As$_2$
Giant nematic response of the incommensurate charge density wave in the nickel-pnictide Ba$_{1-x}$Sr$_x$Ni$_2$As$_2$ Open
Electron nematicity-the breaking of rotational symmetry while preserving translational symmetry-is the quantum analogue of classical nematic liquid crystals. First predicted in 1998, electronic nematicity has been established in a variety …
View article: Enhancement of Superconductivity in WP via Oxide-Assisted Chemical Vapor Transport
Enhancement of Superconductivity in WP via Oxide-Assisted Chemical Vapor Transport Open
Tungsten monophosphide (WP) has been reported to superconduct below 0.8 K, and theoretical work has predicted an unconventional Cooper pairing mechanism. Here we present data for WP single crystals grown by means of chemical vapor transpor…
View article: Potential Lifshitz transition at optimal substitution in nematic pnictide Ba <sub> 1− <i>x</i> </sub> Sr <i> <sub>x</sub> </i> Ni <sub>2</sub> As <sub>2</sub>
Potential Lifshitz transition at optimal substitution in nematic pnictide Ba <sub> 1− <i>x</i> </sub> Sr <i> <sub>x</sub> </i> Ni <sub>2</sub> As <sub>2</sub> Open
BaNi 2 As 2 is a structural analog of the pnictide superconductor BaFe 2 As 2 , which, like the iron-based superconductors, hosts a variety of ordered phases including charge density waves (CDWs), electronic nematicity, and superconductivi…
View article: Charge Order Evolution of Superconducting BaNi2As2 Under High Pressure
Charge Order Evolution of Superconducting BaNi2As2 Under High Pressure Open
BaNi$_2$As$_2$, a non-magnetic superconductor counterpart to BaFe$_2$As$_2$, has been shown to develop nematic order, multiple charge orders, and a dramatic six-fold enhancement of superconductivity via isovalent chemical substitution of S…
View article: Multicomponent superconducting order parameter in UTe <sub>2</sub>
Multicomponent superconducting order parameter in UTe <sub>2</sub> Open
Constraining symmetry Most superconductors have only one transition point, and below a certain temperature, their electrical resistance drops to zero. In very rare cases, another superconducting transition appears at a lower temperature. B…
View article: Absence of precursor incommensurate charge order in electronic nematic Ba0.35Sr0.65Ni2As2
Absence of precursor incommensurate charge order in electronic nematic Ba0.35Sr0.65Ni2As2 Open
Recent discoveries of charge order and electronic nematic order in the iron-based superconductors and cuprates have pointed towards the possibility of nematic and charge fluctuations playing a role in the enhancement of superconductivity. …
View article: Anomalous c-axis Transport Response of UTe$_{2}$.
Anomalous c-axis Transport Response of UTe$_{2}$. Open
We study the temperature dependence of electrical resistivity for currents directed along all crystallographic axes of the spin-triplet superconductor UTe$_{2}$. We focus particularly on an accurate determination of the resistivity along t…
View article: $c$-axis transport in UTe$_{2}$: Evidence of Three Dimensional Conductivity Component
$c$-axis transport in UTe$_{2}$: Evidence of Three Dimensional Conductivity Component Open
We study the temperature dependence of electrical resistivity for currents directed along all crystallographic axes of the spin-triplet superconductor UTe$_{2}$. We focus particularly on an accurate determination of the resistivity along t…
View article: Weyl Superconductivity in UTe2
Weyl Superconductivity in UTe2 Open
The search for a material platform for topological quantum computation has recently focused on unconventional superconductors. Such material systems, where the superconducting order parameter breaks a symmetry of the crystal point group, a…
View article: Discovery of a charge density wave instability in Co-doped BaNi$_2$As$_2$
Discovery of a charge density wave instability in Co-doped BaNi$_2$As$_2$ Open
We have discovered a charge density wave (CDW) instability in BaNi$_2$As2, a structural homologue of the pnictide high temperature superconductor BaFe$_2$As$_2$ in which all the Fe cations are replaced by Ni. It is known that the supercond…
View article: Interaction of Molecular Oxygen with a Hexagonally Reconstructed Au(001) Surface
Interaction of Molecular Oxygen with a Hexagonally Reconstructed Au(001) Surface Open
Kinetics of molecular oxygen/Au(001) surface interaction has been studied at high temperature and near atmospheric pressures of O2 gas with in situ X-ray scattering measurements. In this study, we find that the hexagonal reconstruction (he…