Two-dimensional (2D) Van der Waals compounds exhibit interesting electronic and magnetic properties due to complex intra-layer inter-layer interactions, which are of immense importance in realizing exotic physics as well advanced technology. Various experimental theoretical studies led significantly different ground state often contrasting each other. Here, we studied a novel 2D material, CrSiTe3 employing magnetic, specific heat Raman measurements. Experimental results reveal evidence...

Tire and brake-wear emissions, in particular nanoparticulate aerosols, can potentially impact human health the environment adversely. While there is considerable phenomenological data on tire wear, creation environmental...

Two-dimensional (2D) Van der Waals compounds exhibit interesting electronic and magnetic properties due to complex intralayer interlayer interactions, which are of immense importance in realizing exotic physics as well advanced technology. Various experimental theoretical studies led significantly different ground state often contrasting each other. Here, we studied a novel 2D material, ${\mathrm{CrSiTe}}_{3}$, employing magnetic, specific heat, Raman measurements. Experimental results...

Abstract Observation of ferroelectricity among non-d 0 systems, which was believed for a long time an unrealistic concept, led to various proposals the mechanisms explain same (i.e. magnetically induced ferroelectricity) during last decade. Here, we provide support displacive-type possibly involving magnetic ions due short-range correlations within spin-chain, through demonstration magnetoelectric coupling in Haldane spin-chain compound Er 2 BaNiO 5 well above its Néel temperature ( T N = )...

We report the optical, electronic, vibrational and mechanical properties of a stable, anisotropic, hexagonal (4H) form silver. First principles calculations based on density functional theory were used to simulate phonon dispersion curves electronic band structure 4H-Ag. The data at 0 K do not contain unstable modes, thereby confirming that it is locally stable structure. Fermi surface 4H phase differs in subtle way from cubic phase. Experimental measurements indicate that, when compared...

A parallel array of isolated metal nanowires is expected to be hydrophilic. We show, however, that a clustering such brought about by vacuum drying produces 'dual-scale roughness' and confers strongly hydrophobic property the surface. The mean size nanowire clusters as well contact angle are both found related wire length, critical length above which surface becomes ≈10 µm. Surface roughness generally known enhance water-repellent properties, but this first report roughness-induced...

We have carried out dc magnetization (M), heat-capacity (C) and dielectric studies down to 2K for the compound GdCrTiO5, crystallizing in orthorhombic Pbam structure, which well-known multiferroics RMn2O5 (R= Rare-earths) form. The points of emphasis are: (i) magnetic ordering temperature Cr appears be suppressed compared that isostructural Nd counterpart, NdCrTiO5, Neel is about 21 K. This finding on Gd suggests 4f orbital plays a role magnetism contrast proposal long ago. (ii) Dielectric...

The phase transition from the hexagonal 4H polytype of silver to commonly known 3C (fcc) was studied in detail using x-ray diffraction, electron microscopy, differential scanning calorimetry and Raman spectroscopy. is irreversible accompanied by extensive microstructural changes grain growth. Detailed isothermal calorimetric analysis suggests that it an autocatalytic transformation. Though data suggest exothermic first-order with onset at 155.6 °C (for a heating rate 2 K min−1) latent heat...

Room temperature coexistence of ferromagnetism and ferroelectricity in a thin film novel material nominal composition PbTi0.5Fe0.5O3-d is probed by standard ferroelectric ferromagnetic hysteresis loop measurements scanning probe microscopy various kinds. Both magnetic domains are observed the same spatial region material, implying phase this system. For both order parameters, sample morphology strongly affects roughness domain walls.

The quasi-one-dimensional, chiral crystal structure of Selenium has fascinating implications: we report simultaneous magnetic and ferroelectric order in single crystalline Se microtubes below ≈40 K. This is accompanied by a structural transition involving partial fragmentation the infinite chains without losing overall order. Raman spectral data indicate coupling magnons with phonons electric field, while dielectric constant shows strong dependence on field. Our first-principles theoretical...

We report Raman scattering experiments on single crystals of Ca3Co2O6. The polarization dependent was used to assign symmetry the observed vibrational modes. low temperature show a subtle change in peak widths at 75 K. increase is also accompanied by gain spectral weight for wave numbers greater than 1000 cm−1. have associated lattice distortion and high frequency feature inelastic light processes involving two magnons. These observations are consistent with reported extended x-ray...

Compression of DmaNiFor₃and DmaCoFor₃has been investigated by single-crystal X-ray diffraction and Raman spectroscopy.

Efficient mixing strategies in a fluid involve generation of multi-scale flows which are strongly suppressed highly viscous systems. In this work, we report novel form flow, driven by an external electric field, (η∼ 1 Pa s) oil-in-oil emulsion system consisting micron-size droplets. This electro-hydrodynamic flow leads to dynamical organization at spatial scales much larger than that the individual We characterize dynamics associated with these structures measuring time variation bulk...

Arguments based on the Mermin–Wagner theorem suggest that quasi-1D trigonal phase of Se should be unstable against long wavelength perturbations. Consisting parallel Se–Se chains, this essentially fragile solid undergoes a partial transition to monoclinic structure (consisting 8-membered rings) at low temperatures (≈50 K), and distorted moderate pressures (≈3GPa). Experimental investigations sub-millimeter-sized single crystals provide clear evidence these transitions occur via novel...

We report temperature dependent Raman spectra of multiwalled carbon nanotubes deposited as dilute dispersions on surface enhanced scattering active substrate. At low temperature, i.e, below 30 K both the tangential and disorder mode acquire additional spectral features which are otherwise absent in room spectra. Further, we observe that enhancement effect is more for modes involving motion atoms direction perpendicular to substrate consistent with selection rules. These experiments provide...

Zinc oxide nanorods were synthesized by a direct electrodeposition technique on indium tin plates. The effect of systematic variation the deposition potential and inter-electrode distance morphology ZnO was investigated. X-ray diffraction studies indicated that are highly c-axis oriented. diameter depends mainly electrode separation. Our detailed study synthesis-morphology correlations provide optimal electrochemical conditions required for oriented with minimum diameter.

Zinc Oxide (ZnO) is an n-type wide bandgap semiconductor. Doping of different elements in ZnO potentially affects its structural, optical and electronic properties. We have carried out high pressure angle dispersive x-ray diffraction Raman scattering studies on Zn0.99Cu0.01O. observed the substantial lowering transition threshold from wurtzite to rock salt phase compared pristine ZnO. Experimental findings are also supported through computational data density functional theory simulations....

We demonstrate a simple and robust method to produce large 2-dimensional quasi-3-dimensional arrays of tunable liquid microlenses using time varying external electric field as the only control parameter. With increasing frequency, shape individual lensing elements (~40 μm in diameter) evolves from an oblate (lentil shaped) prolate (egg spheroid, thereby making focal length quantity. Moreover, such can be spatially localized desired configurations by patterning electrode. This system has...

Clustered copper nanorod arrays constitute single-component, two-level hierarchical structures that mimic rose petals by showing high contact angles as well considerable angle hysteresis (CAH). The cluster morphology of the – electrochemically grown within porous alumina templates is determined template geometry and drying conditions. CAH (a measure adhesion) a function length size to inter-cluster separation ratio. measured pinning force was 176 μN, among highest reported. first level...