Simultaneous low-temperature electrical resistivity and Hall effect measurements were performed on single-crystalline Bi2Se3 under applied pressures up to 50 GPa. As a function of pressure, superconductivity is observed onset above 11 GPa with transition temperature Tc upper critical field Hc2 that both increase pressure 30 GPa, where they reach maximum values 7 K 4 T, respectively. Upon further increase, remains anomalously constant the highest achieved pressure. Conversely, carrier...

Advanced in situ characterization is essential for determining the underlying dynamics of laser-material interactions central to both laser welding and rapidly expanding field additive manufacturing. Traditional techniques leave a critical experimental gap understanding complex subsurface fluid flow metal evaporation inherent laser-induced heating metal. Herein, ultra-high-speed transmission X-ray imaging revealed be bridging this information gap, particularly via comparison with validation...

We report x-ray diffraction, electrical resistivity, and magnetoresistance measurements on Bi2Se3 under high pressure low temperature conditions.Pressure induces profound changes in both the room value of resistivity as well dependence resistivity.Initially, drives towards increasingly insulating behavior then, at higher pressures, sample appears to enter a fully metallic state coincident with change crystal structure.Within phase, exhibits an unusual field transverse ∆ρxx that is positive...

Liquid metals have long been treated as Newtonian liquids, but several researchers recently indicated that some may shear thin. While apparent thinning can be caused by surface oxidation, the reports of shear-thinning were investigated using cup and bob type rheometers, which are expected to only weakly impacted contamination effects. We show here even small amounts oxide on liquid cause dramatic changes measured viscosity sample. Using a Searle-type rotational rheometer, we eutectic gallium...

${\mathrm{URu}}_{2}{\mathrm{Si}}_{2}$ exhibits an anomalous peak in the nonlinear magnetic susceptibility at hidden order transition. In to investigate this anomaly, we conducted direct magnetization measurements and investigated detailed angular dependence of $^{29}\mathrm{Si}$ nuclear resonance Knight shift tensor. We find that is smaller than previously reported, analogous tensor below detection limit. Our results suggest magnitude sample dependent.

Recently, static pressures of more than 1.0 TPa have been reported, which raises the question: what is maximum pressure that can be achieved using diamond anvil cell techniques? Here we compile culet diameters, bevel angles, and reported from literature. We fit these data find an expression describes as a function diameter. An extrapolation our reveals diameter 1 μm should achieve ∼1.8 TPa. Additionally, for generation ∼400 GPa with single beveled anvil, most commonly parameters are ∼20 μm,...

Laser powder bed fusion (LPBF) additive manufacturing and laser welding are powerful metal processing techniques with broad applications in advanced sectors such as the biomedical aerospace industries. One common process variable that can tune laser-material interaction dynamics these two is adjustment of composition pressure atmosphere which conducted. While some physical mechanisms governed by ambient well known from literature, it remains unclear how extend to distinct conditions LPBF. In...

Electrical resistivity and ac-calorimetric measurements reveal a complex magnetic phase diagram for single crystals of the ferromagnetic Kondo-lattice compound ${\mathrm{CeAgSb}}_{2}$ at high pressures up to 80 kbar. The order ${T}_{C}=9.6 \mathrm{K}$ ambient pressure is completely suppressed critical ${P}_{C}=35\mathrm{kbar}.$ Another transition, possibly antiferromagnetic, found above 27 kbar, attains maximum value ${T}_{N}\ensuremath{\sim}6\mathrm{K}$ 44 kbar then appears be by...

The onset of antiferromagnetic order in URu2Si2 has been studied via neutron diffraction a helium pressure medium, which most closely approximates hydrostatic conditions. critical is 0.80 GPa, considerably higher than values previously reported. Complementary electrical resistivity measurements imply that the hidden order-antiferromagnetic bicritical point far exceeds 1.02 GPa. Moreover, redefined pressure-temperature phase diagram suggests superconducting and boundaries actually meet at...

Iridium-based 5d transition-metal oxides are attractive candidates for the study of correlated electronic states due to interplay enhanced crystal-field, Coulomb and spin-orbit interaction energies. At ambient pressure, these conditions promote a novel Jeff = 1/2 Mott-insulating state, characterized by gap order ∼0.1 eV. We present high-pressure electrical resistivity measurements single crystals Sr2IrO4 Sr3Ir2O7. While no indications pressure-induced metallic state up 55 GPa were found in...

Extreme magnetoresistance (XMR) in topological semimetals is a recent discovery which attracts attention due to its robust appearance growing number of materials. To search for relation between XMR and superconductivity, we study the effect pressure on LaBi. By increasing pressure, observe disappearance followed by superconductivity at $P\ensuremath{\approx}3.5$ GPa. We find region coexistence LaBi contrast other superconducting The suppression correlated with zero-field resistance instead...

Resonant x-ray emission spectroscopy was used to determine the pressure dependence of $f$-electron occupancy in Kondo insulator ${\mathrm{SmB}}_{6}$. Applied reduces $f$ occupancy, but surprisingly, material maintains a significant divalent character up at least 35 GPa. Thus, closure resistive activation energy gap and onset magnetic order are not driven by stabilization an integer valent state. Over entire range, remarkably stable intermediate valence that can principle support nontrivial...

Single crystals of the filled-skutterudite compound $\mathrm{Nd}{\mathrm{Os}}_{4}{\mathrm{Sb}}_{12}$ have been investigated by means electrical resistivity, magnetization, and specific heat measurements. The $\mathrm{La}{\mathrm{Fe}}_{4}{\mathrm{P}}_{12}$-type cubic structure with a lattice parameter $9.3\phantom{\rule{0.3em}{0ex}}\mathrm{\AA{}}$. Possible heavy-fermion behavior is inferred from measurements, which reveal large electronic coefficient...

An analysis of the optical properties heavy fermion compounds is reported. We focus on 1-1-5 series, where strong deviations spectra are seen from predictions periodic Anderson model. Specifically we demonstrate that differences between experimental results and theoretical can be explained by accounting for momentum dependence hybridization local moments conducting carriers. Furthermore find correlations strength a particular band some compounds. These suggest has to taken into account, an...

We report a high-pressure study of simultaneous low-temperature electrical resistivity and Hall effect measurements on high quality single-crystalline KFe2As2 using designer diamond anvil cell techniques with applied pressures up to 33 GPa. In the low pressure regime, we show that superconducting transition temperature T_c finds maximum onset value 7 K near 2 GPa, in contrast previous reports find minimum reversal dependence at this pressure. Upon applying higher pressures, is diminished...

We experimentally investigate the symmetry in Hidden Order (HO) phase of intermetallic URu2Si2 by mapping lattice and magnetic excitations via inelastic neutron x-ray scattering measurements HO high-temperature paramagnetic phases. At all temperatures respect zone edges body-centered tetragonal phase, showing no signs reduced spatial symmetry, even phase. The originate from transitions between hybridized bands track Fermi surface, whose feature are corroborated phonon measurements. Due to a...

Density Functional Tight Binding (DFTB) is an attractive method for accelerated quantum simulations of condensed matter due to its enhanced computational efficiency over standard Theory approaches. However, DFTB models can be challenging determine individual systems interest, especially metallic and interfacial where different bonding arrangements lead significant changes in electronic states. In this regard, we have created a rapid-screening approach determining systematically improvable...

A key barrier to industrial implementation of droplet-on-demand liquid metal jetting is the limited knowledge process-properties relationships for printed components. Herein we investigate influence two parameters; baseplate temperature and infill rotation angle, on densification, microstructure, tensile properties AlSi7Mg parts produced via magnetohydrodynamic-based additive manufacturing. Adjusting from 220°C-500°C resulted in substantial variation mechanical material, however, angle had a...

A persistent kink in the pressure dependence of "hidden order" (HO) transition temperature URu(2-x)RexSi2 is observed at a critical P(c)=15 kbar for 0 <or= x 0.08. In URu2Si2, P(c) accompanied by destruction superconductivity, change magnitude spin excitation gap, determined from electrical resistivity measurements; and complete gapping portion Fermi surface (FS), inferred scattering competition between HO state superconductivity FS fraction.

We examine the degree of 5f electron localization in URu2Si2 using spin-orbit sum rule analysis U N4,5 (4d \to 5f) edge. When compared to {\alpha}-U metal, US, USe, and UTe, which have increasing states, we find that states are more localized, although not entirely. Spin-orbit shows intermediate coupling is correct angular momentum mechanism for when count between 2.6 2.8. These results direct ramifications theoretical assessment hidden order state URu2Si2, where electrons their contribution...