Article
Multidisciplinary Sciences
Zhanfeng Liu, Tongrui Li, Bo Zhang, Mukhtar Lawan Adam, Wen Zhu, Yuliang Li, Sheng Wang, Yunbo Wu, Hongen Zhu, Dengfeng Cao, Qilong Cui, Shengtao Cui, Yi Liu, Shuangming Chen, Zhe Sun, Li Song
Summary: The non-symmorphic crystal symmetry protection in the layered topological semimetal Nb3SiTe6 can generate exotic band crossings. In this study, high-quality Nb3SiTe6 single crystal was synthesized and its lattice structure and topological properties were characterized using various characterization techniques. The results reveal the presence of unique band crossings and node lines in Nb3SiTe6, providing important clues for further understanding and exploring its topological properties.
Article
Physics, Applied
Yabin Jing, Lifeng Wang
Summary: The wave propagation in a single-layered hexagonal boron nitride metamaterial is investigated using molecular dynamics simulation and finite element method. The metamaterial has an elastic wave bandgap in the THz frequency range, and the wave propagation is confined to the boundary only. The results obtained by the finite element method roughly agree with those of molecular dynamics simulations. The size effect on the bandgap structure is also studied.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Z. J. Chen, Z. J. Xie, Y. J. Jin, G. Liu, H. Xu
Summary: The study introduces a new type of closed nodal lines, intersecting nodal rings, which exhibit unique phonon properties in the real material AgAlO2, providing first-principles calculations support for hybrid nodal-ring phonons.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Physics, Multidisciplinary
Yu He, Su-Di Chen, Zi-Xiang Li, Dan Zhao, Dongjoon Song, Yoshiyuki Yoshida, Hiroshi Eisaki, Tao Wu, Xian-Hui Chen, Dong-Hui Lu, Christoph Meingast, Thomas P. Devereaux, Robert J. Birgeneau, Makoto Hashimoto, Dung-Hai Lee, Zhi-Xun Shen
Summary: Fluctuating superconductivity, characterized by vestigial Cooper pairing in the resistive state of a material, is often associated with low dimensionality, strong disorder, or low carrier density. However, this study shows persistent superconducting fluctuations in heavily hole-doped cuprate superconductor, Bi2Sr2CaCu2O8+delta, despite high carrier density. The research also suggests that a partially flat band at (pi, 0) may enhance superconducting phase fluctuations, and discusses the implications of an anisotropic band structure on phase-coherence-limited superconductivity in overdoped cuprates and other superconductors.
Article
Mechanics
Vivek Gupta, Rajendra Kumar Munian, Bishakh Bhattacharya
Summary: This study investigates a novel hourglass-shaped lattice metamaterial with broadband and multiband characteristics. The unique shape of the metamaterial allows for customizable stiffness profiles, leading to significant enhancement of vibration attenuation capability. By utilizing the concept of a locally resonant phononic crystal, the metamaterial with a wide bandgap is designed. The design incorporates elastic wave resonances to achieve constructive or destructive interference, creating pass bands and stop bands in certain frequency ranges. The bandgap is determined by the geometric configuration, material, and stiffness properties of the unit cell, as well as the host matrix of the resonating mass.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Chemistry, Physical
Tadashi Adachi, Koshi Kurashima, Takayuki Kawamata, Takashi Noji, Satoru Nakajima, Yoji Koike
Summary: In this study, we investigated the ferromagnetic fluctuations in single-layer Bi-2201 and La-214 high-T-c cuprates using magnetization and electrical resistivity measurements. The results show the presence of two-dimensional and three-dimensional ferromagnetic fluctuations in Bi-2201 and La-214, respectively. In Tl-2201, the dimension of ferromagnetic fluctuations is suggested to be two at high temperatures and three at low temperatures.
Article
Chemistry, Multidisciplinary
Ro-Ya Liu, Angus Huang, Raman Sankar, Joseph Andrew Hlevyack, Chih-Chuan Su, Shih-Chang Weng, Meng-Kai Lin, Peng Chen, Cheng-Maw Cheng, Jonathan D. Denlinger, Sung-Kwan Mo, Alexei V. Fedorov, Chia-Seng Chang, Horng-Tay Jeng, Tien-Ming Chuang, Tai-Chang Chiang
Summary: This study presents spectroscopic signatures of a predicted topological hourglass semimetal phase in Nb3SiTe6 through angle-resolved photoemission. The results show the existence of linear band crossings and nodal loops, originating from nontrivial Berry phase and predicted glide quantum spin Hall effect. The observation of saddle-like Fermi surface and in situ alkali-metal doping also reveal other band crossings and correlated parabolic bands with accidental nodal loop states.
Article
Mechanics
Sergey Kuznetsov
Summary: Lamb waves propagating in a layered structure with equal acoustic impedances are studied. The dispersion portraits can distinguish individual layers, even if their acoustic impedances are identical. The developed methodology is adequate for determining geometrical and physical properties of the individual layers with equal acoustic impedances.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
Chunendra K. Sahu, Jerome A. Neufeld
Summary: This study investigates the effects of heterogeneity of permeability in porous media on density-driven flows. Laboratory experiments show that the mixing in heterogeneous media can be significantly greater than in homogeneous media of similar properties. This enhanced mixing is primarily due to the layered structure, which results in transverse gravity-driven fingers and a blunt front.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Computer Science, Information Systems
Yufeng Li, Xiang Chen, Caihua Kong, Longgang Dai, Yufeng Huang
Summary: In this paper, a novel and high-efficiency deep hourglass-structured fusion model is proposed to address the issue of image haze. Unlike conventional methods, the model repeats top-down and bottom-up feature fusion, allowing for more flexible information exchange and aggregation. Extensive assessments demonstrate that the model achieves advanced performance in haze removal.
MULTIMEDIA TOOLS AND APPLICATIONS
(2022)
Article
Physics, Multidisciplinary
Nirakara Pradhan, Shalini Saha, Sapan Kumar Samal, Snehamoy Pramanik
Summary: The present article investigates the propagation behavior of Rayleigh-type waves using the nonlocal theory of elasticity in a layered structure consisting of a gradient transversely isotropic stratum bonded with a gradient monoclinic substrate. A constitutive relation is established for the layered structure, and a dispersion relation for the propagation of Rayleigh-type waves is obtained by considering a complex wavenumber and suitable boundary conditions. The obtained result agrees well with the classical result and demonstrates the potential applications in various aspects.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Materials Science, Multidisciplinary
Dong-Yun Chen, Jin Cao, Botao Fu, Yongkai Li, Xiaoxiong Wang, JunXi Duan, Junfeng Han, Yun-Ze Long, Bing Teng, Dong Chen, Zhonghao Liu, Yugui Yao
Summary: In this study, the electronic structure of the layered compound BaCdSb2 was investigated using various methods, revealing its potential for researching quantum phenomena of 2D Dirac fermions. The samples exhibit semiconductor-like behavior with low carrier density and a small 2D Fermi surface, indicating promise for future research into quantum effects. The results also demonstrate consistent agreement between calculated band structures and experimental data, highlighting the unique properties of BaCdSb2 as a material for studying quantum phenomena.
Article
Materials Science, Multidisciplinary
Zi-Xiang Li, Steven A. Kivelson, Dung-Hai Lee
Summary: This paper presents a theoretical framework for understanding the behavior of overdoped cuprate high temperature superconductors, focusing on d-wave pairing, flat antinodal dispersion, and disorder. Even with homogeneous disorder, these factors lead to granular superconducting correlations and a transition temperature determined largely by the superfluid stiffness rather than the pairing scale.
NPJ QUANTUM MATERIALS
(2021)
Article
Physics, Multidisciplinary
Changwei Zou, Zhenqi Hao, Xiangyu Luo, Shusen Ye, Qiang Gao, Miao Xu, Xintong Li, Peng Cai, Chengtian Lino, Xingjiang Zhou, Dung-Hai Lee, Yayu Wang
Summary: A real-space investigation of cuprates doped beyond the optimal point reveals unconventional behavior in the superconducting state due to pair-breaking scattering. This study shifts the focus of cuprate superconductors research to the overdoped regime and uncovers new unconventional behavior.
Article
Chemistry, Physical
M. Mootabian, S. R. Ghorbani, A. Kompany, M. Ebrahimizadeh Abrishami
Summary: Through comparing the structural and electrical properties of La0.5Sr1.5Mn0.5T0.5O4 with La0.5Sr0.5Mn0.5T0.5O3 manganites, it was found that La0.5Sr1.5Mn0.5T0.5O4 has larger grain size and lower electrical conductivity due to the difference in their layered and perovskite structures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Tobias Froehlich, Zhiwei Wang, Mahasweta Bagchi, Anne Stunault, Yoichi Ando, Markus Braden
PHYSICAL REVIEW MATERIALS
(2020)
Article
Materials Science, Multidisciplinary
K. Jenni, F. Wirth, K. Dietrich, L. Berger, Y. Sidis, S. Kunkemoeller, C. P. Grams, D. Khomskii, J. Hemberger, M. Braden
PHYSICAL REVIEW MATERIALS
(2020)
Article
Materials Science, Multidisciplinary
R. Aeschlimann, M. N. Grisolia, G. Sanchez-Santolino, J. Varignon, F. Choueikani, R. Mattana, V Garcia, S. Fusil, T. Frohlich, M. Braden, B. Delley, M. Varela, P. Ohresser, J. Santamaria, A. Barthelemy, C. Piamonteze, M. Bibes
Summary: This study investigates the magnetic behavior of rare-earth titanates, revealing the ferrimagnetic nature of GdTiO3 and providing insights into its structural and electronic properties in bulk and thin film form. The research sheds light on the insufficiently explored magnetic states of these complex materials, particularly at oxide interfaces.
PHYSICAL REVIEW MATERIALS
(2021)
Article
Physics, Multidisciplinary
Alessandro Ricci, Nicola Poccia, Gaetano Campi, Shrawan Mishra, Leonard Mueller, Boby Joseph, Bo Shi, Alexey Zozulya, Marcel Buchholz, Christoph Trabant, James C. T. Lee, Jens Viefhaus, Jeroen B. Goedkoop, Agustinus Agung Nugroho, Markus Braden, Sujoy Roy, Michael Sprung, Christian Schuessler-Langeheine
Summary: Using x-ray photon correlation spectroscopy, fluctuations in stripe-type spin order of a layered nickelate were observed on timescales of tens of minutes across a wide temperature range. These fluctuations exhibit anomalous temperature dependence, slowing down at intermediate temperatures and speeding up during heating and cooling, reflecting a direct connection with spatial correlations. The decay of nickelate stripe correlations at low temperatures, similar to the competition between stripes and superconductivity in cuprates, occurs through loss of both spatial and temporal correlations.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
J. Stein, S. Biesenkamp, T. Cronert, T. Froehlich, J. Leist, K. Schmalzl, A. C. Komarek, M. Braden
Summary: The domain relaxation process in multiferroic TbMnO3 single crystals under different electric fields and temperatures can be described by a combination of activation law and Merz law, with just two parameters to explain the relaxation times. The domain inversion process is mainly controlled by domain wall motion, with other mechanisms causing accelerated inversion near the multiferroic transition.
PHYSICAL REVIEW LETTERS
(2021)
Review
Physics, Condensed Matter
Pau Jorba, Alexander Regnat, Anh Tong, Marc Seifert, Andreas Bauer, Michael Schulz, Christian Franz, Astrid Schneidewind, Stefan Kunkemoeller, Kevin Jenni, Markus Braden, Andre Deyerling, Marc A. Wilde, James S. Schilling, Christian Pfleiderer
Summary: The study demonstrates that tuning the crystallographic lattice constants can alter the electronic properties of transition-metal and rare-earth compounds, providing access to new forms of order. Experimental setups including tungsten carbide and moissanite cells, as well as bespoke diamond anvil cells, have successfully allowed studies on resistivity and neutron depolarization under high pressure conditions.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2022)
Article
Physics, Multidisciplinary
Yongjian Wang, Henry F. Legg, Thomas Boemerich, Jinhong Park, Sebastian Biesenkamp, A. A. Taskin, Markus Braden, Achim Rosch, Yoichi Ando
Summary: Researchers have discovered that ZrTe5 crystals exhibit a gigantic magnetochiral anisotropy when they are in proximity to a topological quantum phase transition, which is the largest ever observed. The low carrier density, inhomogeneities, and torus-shaped Fermi surface induced by breaking of inversion symmetry in a Dirac material are argued to be central to explaining this extraordinary property.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
K. Jenni, S. Kunkemoeller, A. Tewari, R. A. Ewings, Y. Sidis, A. Schneidewind, P. Steffens, A. A. Nugroho, M. Braden
Summary: The magnetic excitations in ferromagnetic SrRuO3 were investigated using inelastic neutron scattering experiments on triple-axis and time-of-flight spectrometers. The low-energy low-temperature response exhibited a quadratic spin-wave dispersion with an anisotropy gap. The magnon dispersion extended up to 35 meV, with no evidence of a continuum of Stoner excitations below this energy. However, the magnon response weakened at higher energies. In addition to the anomalous softening of the spin-wave stiffness and gap induced by the topology of the Bloch states, the magnon excitations also showed broadening in energy, which increased with temperature.
Article
Materials Science, Multidisciplinary
A. Revelli, M. Moretti Sala, G. Monaco, M. Magnaterra, J. Attig, L. Peterlini, T. Dey, A. A. Tsirlin, P. Gegenwart, T. Froehlich, M. Braden, C. Grams, J. Hemberger, P. Becker, P. H. M. van Loosdrecht, D. I. Khomskii, J. van den Brink, M. Hermanns, M. Grueninger
Summary: Ba3InIr2O9 is a promising candidate for quantum spin-liquid behavior and exhibits magnetism from spin-orbit entangled quasimolecular moments. Our study reveals its unique electronic states and excitations through various experimental and computational methods.
Article
Materials Science, Multidisciplinary
I Vergara, M. Magnaterra, P. Warzanowski, J. Attig, S. Kunkemoeller, D. Khomskii, M. Braden, M. Hermanns, M. Grueninger
Summary: This article discusses the competition between spin-orbit coupling and crystal field splitting in Ca2RuO4, and explains the orbital occupation ratio using optical spectral weights. The study shows that Δ(CF)/ζ is between 2.4 and 4 at 15 K. The crystal field dominates the orbital order of the ground state, but spin-orbit coupling is necessary for a quantitative description of the properties. Furthermore, the crystal field splitting decreases with increasing temperature.
Article
Materials Science, Multidisciplinary
K. Jenni, S. Kunkemoeller, W. Schmidt, P. Steffens, A. A. Nugroho, M. Braden
Summary: By conducting polarized inelastic neutron scattering experiments under magnetic fields, we have determined the chirality of ferromagnetic zone-center excitations as a function of temperature. The results show that the excitation is perfectly chiral in the ferromagnetic phase and when the spontaneous magnetization is almost completely suppressed, the chirality is reduced but does not change sign.
Article
Materials Science, Multidisciplinary
S. Biesenkamp, D. Gorkov, W. Schmidt, K. Schmalzl, Y. Sidis, P. Becker, L. Bohaty, M. Braden
Summary: This study investigates the magnetic structure and multiferroic relaxation dynamics of NaFeGe2O6 using neutron scattering, revealing an additional component of magnetic moments at lower temperatures and demonstrating the reversibility of controlling spin-spiral handedness with external electric fields. The time-resolved measurements show a simple temperature and electric-field dependence of multiferroic relaxation, similar to what has been observed in TbMnO3, with the maximum speed of domain wall motion comparable to the spin-wave velocity.
Article
Materials Science, Multidisciplinary
D. Breuning, T. Froehlich, D. Gorkov, I. Cisarova, Y. Skourski, L. Rossi, B. Bryant, S. Wiedmann, M. Meven, A. Ushakov, S. V. Streltsov, D. Khomskii, P. Becker, L. Bohaty, M. Braden, T. Lorenz
Summary: The Cs3Fe2Br9 material contains Fe2Br9 bi-octahedra with semiclassical S = 5/2 Fe3+ spins, leading to a rich magnetic phase diagram with different ordered phases. The high degree of magnetic frustration and strong magnetoelastic coupling result in a surprisingly complex magnetic behavior in this material.
Article
Materials Science, Multidisciplinary
K. Jenni, S. Kunkemoeller, P. Steffens, Y. Sidis, R. Bewley, Z. Q. Mao, Y. Maeno, M. Braden
Summary: The magnetic excitations in Sr2RuO4 were studied through polarized and unpolarized neutron scattering experiments, revealing that there is no evidence for resonance excitation in the superconducting phase at the scattering vector of the Fermi-surface nesting. Existing data suggests a weakening of scattered intensity in the nesting spectrum at very low energies, while a quasiferromagnetic contribution persists with a finite width in momentum space even at higher temperatures.
Article
Materials Science, Multidisciplinary
S. Biesenkamp, D. Gorkov, D. Bruening, A. Bertin, T. Froehlich, X. Fabreges, A. Gukasov, M. Meven, P. Becker, L. Bohaty, T. Lorenz, M. Braden
Summary: The crystal and magnetic structures of multiferroic LiFe(WO4)(2) were studied through specific heat, susceptibility, and neutron diffraction experiments. Two different magnetic phases with incommensurate order were observed at different temperatures, demonstrating multiferroic behavior. LiFe(WO4)(2) exhibits a simple phase diagram with a sequence of transitions typical for a type-II multiferroic material.
