Electronic transport through exfoliated multilayers of CrSBr, a 2D semiconductor interest because its magnetic properties, is investigated. An extremely pronounced anisotropy manifesting itself in qualitative and quantitative differences all quantities measured along the in-plane b crystallographic directions found. In particular, qualitatively different dependence conductivities σa σb on temperature gate voltage, accompanied by orders magnitude their values (σb /σa ≈ 3 × 102 to 105 at low...

The van-der-Waals material CrSBr stands out as a promising two-dimensional magnet. Here, we report on its detailed magnetic and structural characteristics. We evidence that it undergoes transition to an A-type antiferromagnetic state below TN ≈ 140 K with pronounced character, preceded by ferromagnetic correlations within the monolayers. Furthermore, unravel low-temperature hidden-order long-range magnetically-ordered state. find is associated slowing down of fluctuations, accompanied...

VO2 features concomitant structural and metal-insulator transitions. This poses a challenge for understanding the underlying mechanism: is transition triggered by or an electronic instability? Here, we address this question studying pre-transitional fluctuations in metallic state. By measuring resonant diffuse X-ray scattering find no evidence that spatial of d-electrons are any different from those vanadium ion cores. That is, charge lattice remain coupled as they fluctuate jointly towards...

We investigate the <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mi>c</a:mi></a:math>-direction conduction in CrSBr linear regime, which is not accessible other van der Waals (vdW) magnetic semiconductors, because of unmeasurably low current. The resistivity, <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:mrow><b:msup><b:mn>10</b:mn><b:mn>8</b:mn></b:msup><b:mo>−</b:mo><b:msup><b:mn>10</b:mn><b:mn>11</b:mn></b:msup></b:mrow></b:math> times larger than <c:math...

Abstract We report on the synthesis of LiCrTe <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mi/> <mml:mrow> <mml:mtext>2</mml:mtext> </mml:mrow> </mml:msub> </mml:math> single crystals and their anisotropic magnetic properties. have obtained these by employing a Te/Li-flux method. find to crystallize in TlCdS -type structure with cell parameters = 3.9512(5) Å c 6.6196(7) at T 175 K. The content lithium was determined be neary stoichiometric means...

Progress in the design of functional perovskite oxides relies on advances density theory (DFT) methods to efficiently and effectively model complex systems composed several transition-metal ions. This work reports application DFT investigate electronic structure YSr2Cu2FeO8−δ (0 < δ 1) family which insulating, metal, or superconducting behaviors even anion conductivity can be tuned by modifying oxygen content. In particular, we assess performance generalized gradient approximation (GGA), its...

The structurally related compounds NiI$_2$ and CoI$_2$ are multiferroic van der Waals materials, in which helimagnetic orders exist simultaneously with electric polarization. Here, we report on the evolution of crystal structure magnetic properties across solid solution Co$_{1-x}$Ni$_{x}$I$_2$. We have successfully grown crystals whole range solution, i.e. $x = 0-1$, by employing self-selecting vapor growth (SSVG) technique carefully tuning synthesis conditions according to chemical...

Ozone oxidation has allowed the stabilization of a very high iron state in FeSr2YCu2O7.85 cuprate, which long-range magnetic ordering valent cations coexists with superconducting interactions (magnetic temperature TN = 110 K > critical Tc 70 K). The somewhat unexpected A-type AFM structure, μ(Fe) ∼ 2 μB saturation moment associated hypervalent sublattice, suggests an unusual low spin for cations, while dimensionality structure results soft switching toward ferromagnetism under small external...

We report on the structural and superconducting properties of intermetallic compound BaGaGe. find that this material undergoes a second-order phase transition from distorted ${\mathrm{AlB}}_{2}$-type structure [1H, $a=4.3254(2)$ \AA{}, $c=5.1078(3)$ $P6/mmm$] into ${\mathrm{CaIn}}_{2}$-type [2H, $a=4.3087(3)$ $c=10.2117(6)$ $P{6}_{3}/mmc$] at temperature ${T}_{\mathrm{S}}=253\phantom{\rule{0.28em}{0ex}}\mathrm{K}$. corresponds to coherent buckling honeycomb layers, which we can interpret as...

Substitution of copper by iron in the charge reservoir block YSr2Cu3O6+δ (YSCO) cuprate superconductor brings out an appealing insight on interplay between superconductivity and magnetism. In resulting FeSr2YCu2O7+δ (Fe-1212) materials, FeO1+δ layers CuO2 bi-layers are alternated along stacking direction, close analogy to RuSr2GdCu2O8 (Ru-1212) ferromagnetic superconductor. For FeSr2YCu2O7.57 compound, both BVS calculations spectroscopic data reflect a high doping level superconducting...

The electrochemical properties of YSr₂Cu₂FeO_7+δ with YBaCuO-type structure have been studied.

We investigate the c-direction conduction in CrSBr linear regime, not accessible other van der Waals (vdW) magnetic semiconductors, because of unmeasurably low current. The resistivity -- $10^8$ to $10^{11}$ times larger than a- and b-directions exhibits state dependent thermally activated variable range hopping transport. In spin-flip phase at 2 T, activation energy is 20 meV lower antiferromagnetic state, due a downshift band edge, agreement with ab-initio calculations. average length...

We investigate phonon lifetimes in $\mathrm{V}{\mathrm{O}}_{2}$ single crystals. do so the metallic state above metal-insulator transition (MIT), where strong structural fluctuations are known to take place. By combining inelastic x-ray scattering and Raman spectroscopy, we track temperature dependence of several acoustic optical modes up 1000 K. Contrary what is commonly observed, find that either stay constant or slightly increase with temperature. Our results show pretransitional give...

The iron-substituted FeSr2YCu2O7.08 cuprate displays long-range magnetic ordering below TN ∼ 140 K, involving both Fe3+ cations in the charge reservoir block (CRB) and Cu2+ CuO2 planes. structure comprises antiferromagnetic in-plane coupling within FeO layers, but a ferromagnetic along stacking direction. low dimensional character of is reflected dynamic correlations over wide range temperature, Tonset = 400 K > T as demonstrated by means 57Fe–Mössbauer spectroscopy muon spin relaxation...

Abstract: Exploratory quantum materials discovery remains crucial to progress in material science. Due the grand challenges that we are facing predicting these and their properties from scratch, chemical design principles remain a key ingredient for of new materials. Chemical heuristics, structure, bonding, as well global local symmetries at very foundation properties. In this regard, research, aim identify functional by composition-structure-property understanding. Materials consists subset...

Low-temperature reaction of A-site-ordered layered perovskite Eu2SrFe2O7 (T structure) with CaH2 induces a shift in the Eu2O2 slabs to form Eu2SrFe2O6 T' structure (I4/mmm space group) which only Fe cation is reduced. Contrary previously reported structures Jahn-Teller-active d9 cations (Cu2+ and Ni+), stabilization Fe2+ (d6) reflects stability FeO4 square-planar unit. The T'-type over T-type polymorph confirmed by density functional theory calculations, revealing dz2 occupancy for...

We report on the synthesis of LiCrTe$_2$ single crystals and their anisotropic magnetic properties. have obtained these by employing a Te/Li-flux method. find to crystallize in TlCdS$_2$ -type structure with cell parameters $a$ = 3.9512(5) \r{A} $c$ 6.6196(7) at $T$ 175 K. The content lithium was determined be near stoichiometric means neutron diffraction. pronounced transition $T^{\rm ab}_{\rm N}$ 144 K c}_{\rm 148 K, respectively. These temperatures are substantially higher than earlier...

We report on the structural and superconducting properties of intermetallic compound BaGaGe. find that this material undergoes a second-order phase transition from distorted AlB$_2$-type structure (1H, $a$ = 4.3254(2) Å, $c$ 5.1078(3) P6/mmm) into CaIn$_2$-type (2H, 4.3087(3) 10.2117(6) P6$_3$/mmc) at temperature $T_{\rm S}$ 253 K. phase-transition corresponds to coherent buckling honeycomb layers, which we can interpret as disorder-to-order atoms located within layer. show 2H-BaGaGe becomes...

We investigate phonon lifetimes in VO2 single crystals. do so the metallic state above metal-insulator transition (MIT), where strong structural fluctuations are known to take place. By combining inelastic X-ray scattering and Raman spectroscopy, we track temperature dependence of several acoustic optical modes up 1000 K. Contrary what is commonly observed, find that decrease with decreasing temperature. Our results show pre-transitional give rise electron-phonon onsets hundreds degrees...