Article
Physics, Particles & Fields
Dario Zappala
Summary: We investigate Lifshitz-type scalar field theories that exhibit anisotropic scaling laws and explicit breaking of Lorentz symmetry near the ultraviolet fixed point. It is found that, when all momentum dependent vertex operators are discarded, actions with an anisotropy parameter z = 3 in 3+1 dimensions generate Lorentz symmetry violating quantum corrections that are suppressed by inverse powers of the momentum, thereby restoring the symmetry in the infrared region. In the ultraviolet region, the singular behavior of the corrections is strongly smoothened, with only logarithmic divergences appearing and causing negligible changes in the couplings. For a special case where all couplings are equal, the theory exhibits a Liouville-like potential and the quantum corrections can be exactly summed, resulting in an asymptotically free theory. However, despite the weakening of the divergences, there is still a need for fine tuning of the mass parameter at a very high energy scale to obtain a physically acceptable mass in the infrared region.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Multidisciplinary Sciences
Xi Li, Xiang Luo, Shuai Wang, Ke Xie, Xiang-Pei Liu, Hui Hu, Yu-Ao Chen, Xing-Can Yao, Jian-Wei Pan
Summary: In this study, second sound attenuation in a homogeneous Fermi gas of lithium-6 atoms has been observed at the superfluid transition temperature using Bragg spectroscopy in the long-wavelength limit. The temperature dependence of second sound diffusivity and thermal conductivity has been obtained, and a sudden rise in both diffusivity and conductivity near the critical temperature suggests a larger critical region in the Fermi gas compared to liquid helium. These findings lay the groundwork for determining universal critical scaling functions near quantum criticality.
Article
Materials Science, Multidisciplinary
E. Smirnova, A. Sotnikov, M. Shevelko, N. Zaitseva, H. Schmidt
Summary: This study presents an ultrasonic investigation of a relaxor-based solid solution located within the morphotropic phase boundary, observing attenuation peaks at characteristic temperatures and confirming the dynamic nature of MPB effects on the physical properties of the materials.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Physics, Applied
Maria Vittoria Mazziotti, Roberto Raimondi, Antonio Valletta, Gaetano Campi, Antonio Bianconi
Summary: This passage discusses important phenomena and conclusions in the study of superconductivity in pressurized hydrides, including the manifestation of maximum critical temperature at a specific pressure, and the association between high-order anisotropic Van Hove singularity observed in band-structure calculations of sulfur hydrides and the superstripe phase formed by metallic hydrogen wire modules.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Multidisciplinary
Xuejia Fan, Yiming Lu, Jian Liu, Xikui Ma, Lei Sun, Yangyang Li, Mingwen Zhao
Summary: We investigated the topological phase transitions of RbAg5Se3 using computational methods. The results showed that the shape of the Dirac and Weyl points in the material can be controlled by strain and the insertion of Pt atoms. These findings contribute to a better understanding of topological phase transitions and related transport phenomena.
NEW JOURNAL OF PHYSICS
(2022)
Article
Materials Science, Ceramics
Yang Yin, Yucheng Tang, Wenyuan Pan, Aizhen Song, Jingru Yu, Boping Zhang
Summary: Research has shown that nonergodic relaxor ferroelectrics near the morphotropic phase boundary are favorable for enhancing the piezoelectric and electrostrain properties of materials, thereby reducing the energy barrier for polarization rotation.
CERAMICS INTERNATIONAL
(2021)
Article
Physics, Fluids & Plasmas
Avishay Efrat
Summary: In this study, two types of variances for finite quenched random systems on regular lattices are defined, and it is shown that their ratio is useful in calculating the correlation length for infinite and general random systems as a function of temperature. The numerical method used to obtain these variables is not important, as long as the correlation length obtained can directly provide the critical correlation exponent v.
Article
Physics, Fluids & Plasmas
Yoav Tsori
Summary: The study focuses on the wetting behavior of a pure fluid in contact with a charged flat surface, where wall and ions play a role in enhancing dielectrophoretic and electrophoretic forces. Analytical and numerical calculations of fluid profiles and energy integrals were carried out, leading to the determination of the critical surface potential for prewetting. The research findings are relevant to understanding droplet nucleation around charged particles in the atmosphere and potential deviations from expected nucleation rates.
Article
Physics, Particles & Fields
J. Mestra-Paez, J. M. Pena, A. Restuccia
Summary: In the Horava-Lifshitz theory at the kinetic-conformal point, a wave zone for asymptotically flat fields can be consistently defined in the low energy regime, where physical degrees of freedom satisfy a linear wave equation. The Newtonian contributions do not obstruct free propagation of physical degrees of freedom, and for appropriate couplings, the wave equation becomes relativistic, consistent with General Relativity's gravitational radiation propagation in the wave zone.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Chemistry, Multidisciplinary
Martin F. F. Sarott, Ursina Bucheli, Adrian Lochmann, Manfred Fiebig, Morgan Trassin
Summary: The integration of reliable thin-film ferroelectrics into oxide electronics requires understanding the interplay of growth parameters on polarization. In this study, the polarization of strained PZT films is investigated during epitaxial growth and it is found that the orientation of the polarization can change after growth completion. The temperature and oxygen partial pressure during growth significantly affect the polarization orientation, with higher temperature and oxygen pressure favoring a uniform downward polarization. The mechanism of polarization reorientation is attributed to the formation of a charged Pb defect gradient toward the film surface.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
U. Santhi Krishna, P. K. Madhavan Unni
Summary: We report light scattering investigations and study of phase diagram in the cyclopentanone (CP) + water (W) + secondary butyl alcohol (sBA) system, which is a more promising system for exploring the Quadruple Critical Point (QCP) compared to the methyl ethyl ketone (MEK) + W + sBA system. In contrast to the MEK + W + sBA system, the tunnel-like feature in the phase diagram of CP + W + sBA occurs without the addition of a fourth component. However, the tunnel diameter decreases with increasing X-ketone from 66.626 K to 24.926 K. Addition of a small amount of KSCN is sufficient to split the tunnel-like portion into two paraboloids with an intervening one-phase region. Light scattering investigations reveal non-universal behavior in the system, with Ising-like behavior observed in certain ranges of X-ketone and X-CP, and mean-field behavior observed at X-ketone = 0.2500. The correlation length amplitude of critical concentration fluctuation shows a saturation at a certain range of X-CP.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Materials Science, Multidisciplinary
Shubhpreet Kaur, Mehak Arora, Sunil Kumar, Parambir Singh Malhi, Mandeep Singh, Anupinder Singh
Summary: This study proposes advancements in modern refrigeration technology based on the electrocaloric effect, demonstrating the performance of the (Na0.41K0.09Bi0.50)(Ti1-xMgx)O-3 material. The MgO modified NBT-KBT solid solution exhibits abnormal electrocaloric effect at high doping levels, showing potential applications in the cooling field.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Physics, Applied
Xiangqi Wang, Jun Tan
Summary: This study reports the electrical transport study of a ferromagnetic kagome-lattice material, Nd3Al, which demonstrates a polarity reversal of ordinary Hall resistivity below 40 K and stabilizes to a constant anomalous Hall conductivity. The similarity in scaling behavior of anomalous Hall conductivity in Nd3Al to that of magnetic Weyl semimetal Co3Sn2S2 suggests possible nontrivial topological bands in Nd3Al. The findings unveil the potential of the large intrinsic anomalous Hall effect in Nd3Al for investigating the interaction between ferromagnetism and topology.
APPLIED PHYSICS LETTERS
(2022)
Article
Mechanics
Shuai Li, David E. Rival, Xiaohua Wu
Summary: The study found that the radiating acoustic component dominates over the non-radiating hydrodynamic component above and upstream of the cylinder; in the oscillating near-wake region, the hydrodynamic component dominates over the acoustic component at most frequencies, except at the vortex shedding frequency where they are comparable; away from the oscillating near-wake region, the hydrodynamic pressure fluctuations decrease dramatically while the acoustic pressure fluctuations decay slowly, indicating that the acoustic component is the only one to propagate to the far field.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Chemistry, Physical
Francesco Cordero, Floriana Craciun, Patrizia Imperatori, Venanzio Raglione, Gloria Zanotti, Antoniu Moldovan, Maria Dinescu
Summary: In this study, we measured the properties of a metal-free molecular perovskite material and found that it exhibits ferroelectricity below a certain temperature. We also observed that the material deteriorates and loses mass at high temperatures, leading to a decrease in performance. Unlike traditional ferroelectric materials, the elastic modulus of this material weakens before the ferroelectric phase. The degradation of the material is attributed to point defects, and a method for calculating the defect concentration is proposed.
Article
Crystallography
I. Zamaraite, S. Svirskas, Y. Vysochanskii, K. Glemza, J. Banys, A. Dziaugys
Article
Physics, Applied
I. Zamaraite, V. Liubachko, R. Yevych, A. Oleaga, A. Salazar, A. Dziaugys, J. Banys, Yu. Vysochanskii
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Chemistry, Multidisciplinary
A. Kohutych, V Liubachko, V Hryts, Yu Shiposh, M. Kundria, M. Medulych, K. Glukhov, R. Yevych, Yu Vysochanskii
Summary: The temperature dependence of longitudinal hypersound velocity in CuInP2S6 ferrielectrics was investigated using Brillouin spectroscopy. It was found that the acoustic phonon branch exhibits pronounced softening in the paraelectric phase below T* (approximately 330K) and cooling to the first order phase transition temperature T-c (approximately 312K) into the ferrielectric phase. The softening is induced by the flexoelectric coupling of relaxational soft polar optical and acoustic branches, which is related to an inhomogeneously polarized state appearing between the paraelectric and ferrielectric phases. The anomalous thermal conductivity of the CuInP2S6 crystal near the ferrielectric transition also demonstrates a decrease in the group velocity of heat transferring phonons with cooling from T* to T-c.
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
(2022)
Article
Materials Science, Multidisciplinary
Anna N. Morozovska, Eugene A. Eliseev, Yulian M. Vysochanskii, Viktoria V. Khist, Dean R. Evans
Summary: Using the Landau-Ginzburg-Devonshire approach, the study investigates screening-induced phase transitions in core-shell ferroic nanoparticles of three different shapes: an oblate disk, a sphere, and a prolate needle. The results demonstrate that the screening length of the shell has a critical influence on the phase transitions and spontaneous polarization of the nanoparticle core. The tunable screening shell allows the control of the polar state and phase diagrams, which can be of great significance for nonvolatile memory cells.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Physics, Applied
V. Liubachko, A. Oleaga, A. Salazar, A. Kohutych, A. Pogodin, Yu. Vysochanskii
Summary: The temperature anomalies of heat capacity and entropy in CuInP2S6 layered crystal at ferrielectric ordering can be explained by theoretical studies, which predict the appearance of a critical endpoint and a bicritical endpoint on the phase diagram. Therefore, the splitting of the heat capacity anomaly in Ag0.1Cu0.9InP2S6 mixed crystal can be interpreted as a transformation of the ferrielectric first-order phase transition observed in CuInP2S6 into a sequent paraelectric-ferrielectric second-order phase transition and an isostructural first-order transition with a sharp change of polarization in the ferrielectric phase.
LOW TEMPERATURE PHYSICS
(2023)
Article
Physics, Applied
Anna N. Morozovska, Eugene A. Eliseev, Mykola E. Yelisieiev, Yulian M. Vysochanskii, Dean R. Evans
Summary: Using the Landau-Ginzburg-Devonshire approach, the stress-induced transformations of polarization switching in CuInP2S6 nanoparticles of different shapes were studied. The semiconducting properties of the nanoparticles were modeled using a surface-charge layer with a small effective screening length due to the field effect. The results showed a strong and unusual influence of hydrostatic pressure on polarization switching, hysteresis loop shape, magnitude of remanent polarization, and coercive fields.
PHYSICAL REVIEW APPLIED
(2023)
Article
Materials Science, Multidisciplinary
Anna N. Morozovska, Eugene A. Eliseev, Ayana Ghosh, Mykola E. Yelisieiev, Yulian M. Vysochanskii, Sergei V. Kalinin
Summary: In this study, the strain-induced polarization reversal in a ferroelectric CuInP2S6 (CIPS) thin film with conductive electrodes is explored. The study reveals an unusually strong effect of mismatch strain on the out-of-plane polarization reversal, hysteresis loop shape, dielectric susceptibility, and piezoelectric response of CIPS films.
Article
Physics, Condensed Matter
V. Pashchenko, O. Bludov, D. Baltrunas, K. Mazeika, S. Motria, K. Glukhov, Yu. Vysochanskii
Summary: The experimental studies of the paramagnetic-antiferromagnetic phase transition in the layered Cu0.15Fe0.85PS3 crystal are presented, utilizing Mossbauer spectroscopy and measurements of temperature and field dependencies of magnetic susceptibility. The observed peculiar behavior at low temperatures indicates weak ferromagnetism in the studied alloy. Ab initio simulations of the electronic and spin subsystems reveal the peculiarities of spin ordering at low temperatures and changes in interatomic interactions near the Cu substitutional atoms.
CONDENSED MATTER PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Anna N. Morozovska, Eugene A. Eliseev, Sergei Kalinin, Yulian M. Vysochanskii, Petro Maksymovych
Summary: By using the Landau-Devonshire approach and experimental results, a multiwell thermodynamic potential for the layered ferroelectric material CuInP2S6 (CIPS) was constructed, revealing the important role of nonlinear electrostriction in the material. The study calculated temperature and pressure phase diagrams and spontaneous polarization of bulk CIPS, as well as strain-induced phase transitions in thin films and stress-induced phase transitions in nanoparticles. The results also showed the significant influence of mismatch strain, elastic stress, and shape anisotropy on the phase diagrams and polar properties of nanoscale CIPS, with analytical expressions allowing for elastic control of polar properties.
Article
Materials Science, Multidisciplinary
Anna N. Morozovska, Eugene A. Eliseev, Kyle Kelley, Yulian M. Vysochanskii, Sergei Kalinin, Petro Maksymovych
Article
Materials Science, Multidisciplinary
V Liubachko, A. Oleaga, A. Salazar, R. Yevych, A. Kohutych, Yu Vysochanskii
