A topological insulator can be converted to an axion when time reversal symmetry is broken, which leads the opening of a gap in Dirac surface state. Recently, MnBi${}_{2}$Te${}_{4}$ was predicted host such state upon antiferromagnetic ordering. Collecting and analyzing very detailed photoemission data, authors demonstrate that this does not occur remains gapless well below N\'eel temperature. Most likely, due complexity magnetic ordering at surface. The quest for discovery is, therefore, still on.

Very strong magnetoresistance and a resistivity plateau impeding low temperature divergence due to insulating bulk are hallmarks of topological insulators also present in semimetals where the is induced by magnetic field, when time-reversal symmetry (protecting surface states insulators) broken. Similar features were observed simple rock-salt-structure LaSb, leading suggestion possible non-trivial topology 2D this compound. We show that its sister compound YSb characterized giant exceeding...

Monobismuthides of yttrium and lutetium are shown as new representatives materials which exhibit extreme magnetoresistance magnetic-field-induced resistivity plateau. At low temperatures in magnetic field 9T the attains order magnitude 10,000% 1,000%, on YBi LuBi, respectively. Our thorough examination electron transport properties both compounds show that observed features consequence nearly perfect carrier compensation rather than possible nontrivial topology electronic states. The...

Several rare-earth monopnictides were shown to exhibit extreme magnetoresistance and field-induced low-temperature plateau of electrical resistivity. These features are also hallmarks topological semimetals, thus the family is intensively explored with respect magneto-transport properties possible hosting Dirac fermion states. We report a comprehensive investigation Fermi surface transport LuSb, another representative this family. At low temperatures, LuSb was found exceed 3000% without...

Contrary to topological insulators, semimetals possess a nontrivial chiral anomaly that leads negative magnetoresistance and are hosts both conductive bulk states surface with intriguing transport properties for spintronics. Here, we fabricate highly-ordered metallic Pt3Sn Pt3SnxFe1-x thin films via sputtering technology. Systematic angular dependence (both in-plane out-of-plane) study of presents surprisingly robust quadratic linear longitudinal features Pt3SnxFe1-x, respectively. We...

We use tunable, vacuum ultraviolet laser based angle-resolved photoemission spectroscopy and density functional theory (DFT) calculations to study the electronic properties of Dirac semimetal candidate cubic ${\mathrm{PtBi}}_{2}$. In addition bulk states we also find surface in ${\mathrm{PtBi}}_{2}$, which is expected as ${\mathrm{PtBi}}_{2}$ was theoretically predicated be a semimetal. The are well reproduced from DFT band calculations. Interestingly, topological form Fermi contours rather...

We performed comprehensive theoretical and experimental studies of the electronic structure Fermi surface topology two novel quantum materials, MoSi$_2$ WSi$_2$. The predictions in vicinity level was verified experimentally by thorough analysis observed oscillations both electrical resistivity magnetostriction. established that sheets WSi$_2$ consist 3D dumbbell-shaped hole-like pockets rosette-shaped electron-like pockets, with nearly equal volumes. Based on this finding, materials were...

α″–Fe16N2 has been investigated as one of promising candidates for environment-friendly magnets. While giant saturation magnetization previously experimentally observed in α″–Fe16N2, its magnetic anisotropy and structural stability leave room improvement. Recent theoretical studies have considered alloying Fe16N2 with various elements to improve the properties and/or against decomposition. However, estimates particular are typically restricted simple ground-state-energy comparisons, i.e....

Single crystals of the cerium intermetallic compound CeIr2Zn20 were grown by flux method, and studied means x-ray diffraction, magnetic, electrical transport, thermodynamic measurements. The crystallizes with cubic CeCr2Al20-type crystal structure, in which Ce transition metal atoms are located inside cages formed Al/Zn atoms. shows paramagnetic behavior metallic-like conductivity. bulk physical data conjointly indicate its intermediate valence character due to an unstable 4f shell....

Single crystals of U T 2 Zn 20 ( = Fe, Co, Ru, Rh, Ir) compounds were studied by means X-ray diffraction, magnetic susceptibility, electrical resistivity and heat capacity measurements. The results revealed moderately heavy fermion character all these materials with paramagnetic ground states due to itinerant 5 f electrons.

The localized-to-itinerant transition of f electrons lies at the heart heavy-fermion physics, but has only been directly observed in single-layer Ce-based materials. Here, we report a comprehensive study on electronic structure and nature Ce 4f superconductor Ce2PdIn8, typical n=2 CenMmIn3n+2m compound, using high-resolution 4d-4f resonance photoemission spectroscopies. this material studied over wide temperature range, hybridization between conduction can be clearly to form Kondo near Fermi...

We use magnetization measurements, high-resolution angle-resolved photoemission spectroscopy (ARPES), and density functional theory (DFT) calculations to study the electronic properties of $\mathrm{Au}{}_{2}\mathrm{Pb}$, a topological superconductor candidate. The measurements reveal three discontinuities at 40, 51, 99 K that agree well with reported structural phase transitions. To measure band structure along desired crystal orientations, we utilized polishing, sputtering, annealing obtain...

High-quality single crystals of UIr${}_{2}$Zn${}_{20}$ were studied by means x-ray diffraction, magnetic, electrical transport, and heat capacity measurements. In striking contrast with the literature data that classify compound as an itinerant heavy-fermion ferromagnet ${T}_{C}$ $=$ 2.1 K, no long-range magnetic ordering was found for samples investigated down to 350 mK.

We report the observation of superconductivity in single-crystalline ${\mathrm{CaPd}}_{2}{\mathrm{P}}_{2}$ and ${\mathrm{SrPd}}_{2}{\mathrm{P}}_{2}$ obtained from Bi-flux. Both crystallize ${\mathrm{ThCr}}_{2}{\mathrm{Si}}_{2}$-type structure (space group I4/mmm) with a short P-P distance. Electrical resistivity specific heat measurements conjointly corroborate bulk at ${T}_{c}\ensuremath{\sim}1.0$ K $\mathrm{\ensuremath{\Delta}}C/\ensuremath{\gamma}{T}_{\mathrm{c}}=1.42$ for...

We investigated temperature dependent current driven spin-orbit torques in magnetron sputtered ${\mathrm{Ru}}_{2}{\mathrm{Sn}}_{3}$ (4 and 10 nm)/${\mathrm{Co}}_{20}{\mathrm{Fe}}_{60}{\mathrm{B}}_{20}$ (5 nm) layered structures with in-plane magnetic anisotropy. The room dampinglike fieldlike spin torque efficiencies of the amorphous films were measured to be $0.14\ifmmode\pm\else\textpm\fi{}0.008\phantom{\rule{0.16em}{0ex}}(0.07\ifmmode\pm\else\textpm\fi{}0.012)$...

Non-centrosymmetric $\mathrm{Eu}T{\mathrm{Ge}}_{3}$ ($T$= Co, Ni, Rh, and Ir) possesses magnetic ${\mathrm{Eu}}^{2+}$ ions, antiferromagnetic ordering appears at low temperatures. Transition-metal substitution leads to changes in the unit-cell volume ordering. However, temperature does not scale with change, Eu valence is expected remain divalent. Here we study bulk electronic structure of non-centrosymmetric by hard x-ray photoelectron spectroscopy. The $3d$ core-level spectrum confirms...

Polarized neutron and bulk magnetic measurements were performed on a high-quality single crystal of UMn${}_{2}$Al${}_{20}$. Magnetization data indicated ferromagnetic ordering that sets in below ${T}_{C}=17.5$ K. Near-zero-field the magnetization confirmed spontaneous nature order. The density maps, rendered using maximum-entropy method, clearly showed moments are present Mn sites only, which was not hitherto suggested. moment value derived from polarized flipping ratios agrees with obtained...

A polycrystalline sample of La2NiSi3 was investigated by means heat capacity, magnetic susceptibility, magnetization, electrical resistivity and magnetoresistivity measurements. The compound basically characterized as a Pauli paramagnet with metallic-like conductivity, notably reduced in magnitude weakly temperature dependent, is usually observed for atomically disordered systems. Furthermore, the experimental data revealed presence small amount paramagnetic impurities. As result,...

A novel antiferromagnetic semiconductor, Eu₃Sn₂P₄, is discovered and prepared using Sn-flux method. The crystal structure shows that the six Sn–Sn dimers connected by P atoms form Sn₁₂P₂₄ crown-shape cluster with Eu located in center.

The magnetocrystalline anisotropy (MCA) energy of the giant saturation magnetization candidate material α″–Fe16N2 was investigated using first-principles electronic-structure calculations. plane-wave density-functional theory (DFT) code Quantum ESPRESSO employed to study effect different DFT approaches on system, particularly influence exchange-correlation functionals and pseudopotential methods. MCA energies obtained this way are within range previous theoretical experimental results, while...

While giant saturation magnetization has been observed in α″–Fe16N2, its magnetic anisotropy and structural stability leave room for improvement. Several recent studies have investigated the effect of substitution to improve properties and/or stability; among these, Fe with V or Cu shown promise. We thus compare such alloys some more detail using first-principles electronic-structure calculations: The magnetocrystalline (MCA) energies ordered Fe16–nVnN2 Fe16–nCunN2 (n=1, 2), as well...