Article
Chemistry, Physical
Bushra Khan, Manoj K. Singh, Aditya Kumar, Arushi Pandey, Sushmita Dwivedi, Upendra Kumar, Surbhi Ramawat, Sumit Kukreti, Ambesh Dixit, Somnath C. Roy
Summary: KBiFe2O5 (KBFO) is a multiferroic compound with a narrow band gap, synthesized using sol-gel technique and characterized by XRD, SEM, UV visible spectroscopy, electrical, magnetic, and impedance spectroscopy analyses. The results confirm the multiferroic behavior, weak ferromagnetic nature, negative magneto-dielectric coupling, and strong MD coupling in KBFO, making it a promising candidate for room-temperature multiferroicity with potential for photovoltaic applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Koyal Suman Samantaray, Ruhul Amin, Saniya Ayaz, A. K. Pathak, Christopher Hanley, A. Mekki, K. Harrabi, Somaditya Sen
Summary: The (1-x)Na0.5Bi0.5TiO3-(x) CaMnO3 compositions prepared by sol-gel method exhibit a Rhombohedral (R3c) phase up to x = 0.06, while a mixed Rhombohedral (R3c) and orthorhombic (Pnma) phases are observed for x = 0.12. The lattice volume decreases with increasing CaMnO3 content. The phase transition temperature (T-c) decreases with increasing CaMnO3 composition. The x = 0.03 composition shows an increase in room temperature dielectric constant and a decrease in loss, attributed to a decrease in oxygen vacancy and Bi loss confirmed by XPS analysis. All compositions exhibit variation in room temperature dielectric property with the application of a magnetic field, confirming a magnetodielectric coupling. The x = 0.06 composition shows the highest negative magnetodielectric coupling constant (MD%) of 3.69 at 100 kHz with an applied field of 5 kG.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Chemistry, Multidisciplinary
Adrian Fuchs, Petra Mannhardt, Patrick Hirschle, Haoze Wang, Irina Zaytseva, Zhe Ji, Omar Yaghi, Stefan Wuttke, Evelyn Ploetz
Summary: This study addresses the gap between the crystal structure of a material and its bulk properties by using optical microscopy and spectroscopy for the correlative analysis of metal-organic framework particles in situ. The authors demonstrate that the crystal shape strongly impacts optical absorption and discuss the distribution and adsorption of water within MOF-801. The results highlight the importance of particle level characterization in understanding material properties.
ADVANCED MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Qirui Yang, Yongqiang Li, Jiarui Zhang, Qi Qi, Kai Chen, Ying Wang, Junming Liu, Jinsong Zhu
Summary: The room-temperature permittivity decreases by one order of magnitude in a wide frequency range as the stoichiometric proportion of Cu in CaCu3Ti4O12 is reduced from 3 to 2, and then to 1. This reduction, which is almost independent of frequency and temperature, suggests the presence of intrinsic dielectric coupling between binary dielectric polarization species. This coupling is attributed to the influence of less polar Cu 3d electrons on the permittivity contribution from one-dimensional dipole chains of thermally activated off-center displacements of Ti ions.
Article
Chemistry, Multidisciplinary
Vladimir Bruevich, Leila Kasaei, Sylvie Rangan, Hussein Hijazi, Zhenyuan Zhang, Thomas Emge, Eva Y. Andrei, Robert A. Bartynski, Leonard C. Feldman, Vitaly Podzorov
Summary: The first experimental realization of intrinsic charge conduction in lead-halide perovskite field-effect transistors is reported. This is enabled by a new vapor-phase epitaxy technique, extensive materials analysis, and the fabrication of near-ideal FETs. The study reveals an increase in intrinsic mobility with decreasing temperature, indicating phonon-limited band transport.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Philipp Metsch, Dirk Romeis, Karl A. Kalina, Alexander Rassloff, Marina Saphiannikova, Markus Kaestner
Summary: In this study, the magneto-mechanical coupling in magneto-active elastomers is investigated from two modeling perspectives: a micro-continuum and a particle-interaction approach, demonstrating their capabilities through representative examples. A systematic comparison of these approaches in a hybrid multiscale framework shows a remarkable agreement in model predictions, enhancing the understanding of interactions in magneto-active elastomers with chain-like microstructures.
Review
Chemistry, Multidisciplinary
Huayang Li, Nan Shen, Shi Chen, Fei Guo, Baomin Xu
Summary: Metal halide perovskite shows great potential for applications in various optoelectronic devices due to its excellent optoelectronic properties, low-cost raw materials, and easy fabrication process. However, the presence of defects, ion migration, and limited stability in polycrystalline thin-films hinder their device performance. In contrast, perovskite single crystals demonstrate better properties and stability, making them an attractive choice for optoelectronic devices and fundamental research. This review summarizes recent progress in the growth methods of perovskite single crystals, discusses their intrinsic properties, and explores their applications in different optoelectronic devices.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Tianyu Wang, Kai Zhao, Pan Wang, Wanfu Shen, Haikuo Gao, Zhengsheng Qin, Yongshuai Wang, Chunlei Li, Huixiong Deng, Chunguang Hu, Lang Jiang, Huanli Dong, Zhongming Wei, Liqiang Li, Wenping Hu
Summary: This study demonstrated the construction of polarization-sensitive photodetectors based on the organic semiconductor 2,6-diphenyl anthracene (DPA) single crystals, showing strong anisotropy in molecular vibration, optical reflectance, and optical absorption. Theoretical calculations confirmed that the polarization sensitivity of DPA crystals originated from the anisotropic in-plane crystal structure. This work opens up possibilities for developing compact polarization photodetectors and new functionalities in flexible optical and optoelectronic applications.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Riju Karmakar, Amit Kumar Das, Subhamay Pramanik, Probodh Kumar Kuiri, Ajit Kumar Meikap
Summary: Free-standing PVA-chitosan blending and hematite encapsulated composite films with excellent dielectric properties and semiconducting behavior have been prepared, showing potential applications in the organic semiconductor device domain in the near future.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Biochemical Research Methods
Yongxiang Feng, Zhen Cheng, Huichao Chai, Weihua He, Liang Huang, Wenhui Wang
Summary: The study demonstrates the use of neural network technology to achieve real-time characterization of cellular intrinsic properties and classification based on intrinsic parameters, significantly improving calculation speed. Experimental results show a high accuracy in cell type classification and minimal impact on cell properties from IFC testing.
Article
Physics, Multidisciplinary
Matthieu Liparo, Jean-Philippe Jay, Matthieu Dubreuil, Gaelle Simon, Alain Fessant, Walaa Jahjah, Yann Le Grand, Charles Sheppard, Aletta R. E. Prinsloo, Vincent Vlaminck, Vincent Castel, Loic Temdie-Kom, Guillaume Bourcin, David Spenato, David T. Dekadjevi
Summary: Using the photostrictive effect, visible light can be used to control the anisotropic magnetic properties of materials, and a converse magneto-photostrictive coupling coefficient is proposed to assess the magnetization changes under this effect.
COMMUNICATIONS PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Nahida Hassan, Basharat Want
Summary: In this study, multiferroic composites of Yb-doped PbZrTiO3-Nd-doped CoFe2O4 with varying concentrations were synthesized using solid-state reaction method. XRD and SEM analysis confirmed their crystallographic phases and non-uniform distribution with agglomerated grains. The composites exhibited both ferroelectric and ferromagnetic properties, with strong magneto-dielectric coupling, and showed improvement in magneto-capacitance at higher ferrite content, indicating their multifunctionality and applicability in modern technology.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Chemistry, Multidisciplinary
Sidra Khalid, Saira Riaz, Samia Naeem, Aseya Akbar, S. Sajjad Hussain, Y. B. Xu, Shahzad Naseem
Summary: A novel approach combining microwave radiations and aluminum doping is proposed to achieve multifunctionality and spin polarization in iron oxide thin films. Control over structural transitions in the thin films is achieved through the combined effect of microwave radiations and Al doping. The transition from gamma-Fe2O3 to Fe3O4 thin films is confirmed at Al concentrations of 6-10 wt%, leading to an increase in saturation magnetization and observation of Verwey transition.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Physics, Condensed Matter
Rutvi J. Pandya, Sushant Zinzuvadiya, Poornima Sengunthar, Shivangi S. Patel, Nisha Thankachen, U. S. Joshi
Summary: Investigated the effect of rare Fe doping on the properties of CCMO ceramics, revealing an increase in real permittivity and a decrease in optical band gaps with Fe doping. Additionally, a room temperature ME coupling coefficient of 1.7 mV/cm Oe was achieved for pure CCMO.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Materials Science, Multidisciplinary
K. Cermak Sraitrova, J. Cizek, V Holy, J. Kasparova, T. Plechacek, V Kucek, J. Navratil, A. Krejcova, C. Drasar
Summary: The study on ambivalent doping of SnSe single crystals reveals that As atoms preferentially substitute Se atoms to create As-Se defects, impacting the Sn vacancies differently in the two sets. A low concentration of As in the first set facilitates the healing of intrinsic defects and formation of SnSe2, whereas the second set shows a significant increase in Sn vacancies upon doping. The interaction between doping species and intrinsic defects leads to modifications in the properties of defects, with a tendency for defect clustering observed.
Article
Physics, Applied
P. Monalisha, Shengyao Li, Tianli Jin, P. S. Anil Kumar, S. N. Piramanayagam
Summary: This study presents a metallic channel-based three-terminal electrolyte-gated artificial synapse capable of non-volatile rewritable conductance states and simulating various synaptic behaviors. The switching between short-term and long-term memory regimes has been successfully demonstrated through repeated training.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Physics, Applied
Saikat Maji, Ankan Mukhopadhyay, Soubhik Kayal, P. S. Anil Kumar
Summary: The heavy metal/ferromagnet interfaces in systems with perpendicular magnetic anisotropy (PMA) exhibit chiral Neel wall with the assistance of interfacial Dzyaloshinskii-Moriya interaction (iDMI). We investigated the field induced domain wall motion in the creep regime to estimate the effective iDMI strength, D eff , in sputter-deposited Ta/Pt/Co/Pt and Ta/Pt/Co/Au/Pt thin films. The introduction of ultrathin Au layers at the top Co/Pt interface allowed us to control the iDMI and change the chirality of the domain wall.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Condensed Matter
Minna Theres James, Shoubhik Mandal, Nirmal K. Sebastian, Pramita Mishra, R. Ganesan, P. S. Anil Kumar
Summary: This study reports the temperature-dependent structural characterization of type-II Dirac semimetal NiTe2 using bulk single crystal and 200 nm thick nanoflakes. X-ray diffraction and Rietveld refinement analysis confirm excellent crystallinity and linear thermal expansion coefficient along different lattice directions. Raman spectra analysis shows non-linear variations in phonon frequency and full-width half maxima of certain modes.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Physics, Condensed Matter
Shoubhik Mandal, Debarghya Mallick, Yugandhar Bitla, R. Ganesan, P. S. Anil Kumar
Summary: Recently, it has been shown that Bi1Te1 is a dual topological insulator with both quasi-1D surface states and topological crystalline insulating surface states. Moreover, Bi1Te1 is predicted to be a higher order topological insulator. However, experimental studies on the Bi1Te1 single crystal and its doping effects are lacking. In this study, magneto-transport measurements were performed on exfoliated microflakes and Sb-doped Bi1Te1 single crystals. The results revealed the presence of decoupled topological surface states and provided insights into the thickness-dependent dephasing mechanism and the strength of bulk-surface coupling.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Nanoscience & Nanotechnology
P. Monalisha, Shengyao Li, Tianli Jin, P. S. Anil Kumar, S. N. Piramanayagam
Summary: Electrolyte-gated transistors (EGTs) are considered essential components in neuromorphic computing systems for low-power artificial intelligence. In this study, a three-terminal synaptic transistor based on ruthenium-doped cobalt ferrite (CRFO) thin films by electrolyte gating was developed, demonstrating multilevel non-volatile conductance states for analog computing and high-density storage. Furthermore, the proposed synaptic transistor exhibited essential synaptic behavior, including spike amplitude-dependent plasticity, spike duration-dependent plasticity, long-term potentiation, and long-term depression.
Article
Physics, Multidisciplinary
Daniel S. S. Sanchez, Tyler A. A. Cochran, Ilya Belopolski, Zi-Jia Cheng, Xian P. Yang, Yiyuan Liu, Tao Hou, Xitong Xu, Kaustuv Manna, Chandra Shekhar, Jia-Xin Yin, Horst Borrmann, Alla Chikina, Jonathan D. D. Denlinger, Vladimir N. N. Strocov, Weiwei Xie, Claudia Felser, Shuang Jia, Guoqing Chang, M. Zahid Hasan
Summary: The classification of electronic phases is based on two prominent paradigms: correlations and topology. Electron correlations lead to superconductivity and charge density waves, while the Berry phase gives rise to electronic topology. The combination of these two paradigms has prompted the search for electronic instabilities near the Fermi level of topological materials. This study identifies the electronic topology of chiral fermions as the driving force behind van Hove singularities that host electronic instabilities in the surface band structure.
Article
Materials Science, Multidisciplinary
Aditya A. Wagh, Shwetha G. Bhat, V. K. Anusree, P. N. Santhosh, Suja Elizabeth, P. S. Anil Kumar
Summary: Rare-earth chromates (RECrO3) and manganites (REMnO3) are potential room temperature multiferroics. The challenge in confirming the ferroelectric phase lies in the presence of artefacts and undesirable signals, especially in pyroelectric current measurement technique. A modified approach called 4-segment thermal cycling protocol is proposed to isolate the irreversible thermally stimulated current from the reversible electric polarization in ferroelectric phase. Experimental verification is done using the prototype ferroelectric material, Glycine Phosphite, and polycrystalline materials, HoCrO3 and DyFe0.5Mn0.5O3, showing no reversible spontaneous electric polarization within the tested temperature ranges.
CURRENT APPLIED PHYSICS
(2023)
Article
Physics, Applied
P. Monalisha, Shengyao Li, Shwetha G. G. Bhat, Tianli Jin, P. S. Anil Kumar, S. N. Piramanayagam
Summary: Neuromorphic computing (NC) is a crucial step towards efficient AI systems, and electrolyte-gated synaptic transistors based on spinel ferrite provide a platform for future NC applications. This study reports a three-terminal electrolyte-gated synaptic transistor using Fe3O4 thin films, which allows gate-controllable multilevel, non-volatile, and rewritable states for analog computing. Essential synaptic functions can be emulated by applying electrical stimulus to the gate terminal.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Applied
Kunjalata Majhi, Vivek K. Manu, R. Ganesan, P. S. Anil Kumar
Summary: We investigated the growth of high-quality BiSe thin films on Si (111) substrates at different temperatures using pulsed laser deposition. The sample quality improved as the substrate temperature increased, with BiSe Raman modes emerging at a substrate temperature of 250 degrees C. The modes matched closely with those of single crystals at a substrate temperature of 325 degrees C. By studying the structural properties and Raman modes at each substrate temperature, we identified the optimal condition for growing high-quality BiSe thin films via pulsed laser deposition.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Multidisciplinary
Shoubhik Mandal, Abhishek Banerjee, R. Ganesan, P. S. Anil Kumar
Summary: The electronic structure of α-RuCl3 single crystals was investigated using photoluminescence spectroscopy. A broad principal peak at E-PL around 1.87 eV, close to the energy required for optical transition across the ligand field splitting gap, was observed. This gap increases with temperature and is attributed to thermal expansion and electron-phonon interaction. The multiplet structure of the photoluminescence spectra can be explained by d-d transitions forbidden by parity, based on single ion ligand-field theory.
NEW JOURNAL OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
Belen E. Zuniga-Cespedes, Kaustuv Manna, Hilary M. L. Noad, Po-Ya Yang, Michael Nicklas, Claudia Felser, Andrew P. Mackenzie, Clifford W. Hicks
Summary: By applying a combination of uniaxial stress and magnetic field, we have observed a significant anomalous Hall effect in a bulk sample of a cubic member of the Mn3X family for the first time. The observed effect remains unchanged when the stress is removed, indicating that it is not induced by stress-induced ferromagnetic moments.
NEW JOURNAL OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
Tyler A. Cochran, Ilya Belopolski, Kaustuv Manna, Mohammad Yahyavi, Liu Yiyuan, Daniel S. Sanchez, Cheng Zi-Jia, Xian P. Yang, Daniel Multer, Yin Jia-Xin, Horst Borrmann, Alla Chikina, Jonas A. Krieger, Jaime Sanchez-Barriga, Patrick Le Fevre, Francois Bertran, Vladimir N. Strocov, Jonathan D. Denlinger, Chang Tay-Rong, Jia Shuang, Claudia Felser, Hsin Lin, Chang Guoqing, M. Zahid Hasan
Summary: In this Letter, the authors discovered the higher-fold topology of a chiral crystal using a combination of fine-tuned chemical engineering and photoemission spectroscopy. They identified all bulk branches of a higher-fold chiral fermion and revealed a multigap bulk boundary correspondence. This demonstration of multigap electronic topology will drive future research on unconventional topological responses.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Applied
Ajin Joy, Soubhik Kayal, P. S. Anil Kumar
Summary: By engineering interfacial anisotropy, we stabilized Skyrmions in Cu (x=0.65 nm) at the HM-FM interface and achieved their motion at room temperature with a velocity of 260 m/s. This system with optimized magnetic anisotropy exhibited a low skyrmion Hall effect.
APPLIED PHYSICS LETTERS
(2023)
Article
Multidisciplinary Sciences
Nicholas P. Quirk, Guangming Cheng, Kaustuv Manna, Claudia Felser, Nan Yao, N. P. Ong
Summary: This study reports a unique transport property observed in crystals of the ferromagnetic nodal-line Weyl semimetal Co2MnGa that have been polished to micron thicknesses using a focused ion beam. These thin crystals exhibit a large planar resistance anisotropy with axes that rotate by 90 degrees between opposite faces of the crystal. The observed anisotropy is suggested to resemble that of an isotropic conductor with surface states that are impeded from hybridization with bulk states, based on symmetry arguments and electrostatic simulations.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Mithun Ghosh, P. D. Babu, P. S. Anil Kumar
Summary: In this study, the longitudinal resistivity, anisotropic magnetoresistance (MR), and Hall effect of epitaxial Nd2Ir2O7 (111) thin films were investigated. The results showed that the magnetic structure of Ir4+ 5d moments could be tuned by applying a magnetic field along different crystallographic directions. A large spontaneous Hall effect (SHE) signal and a topological-like Hall signal were observed, indicating the presence of Weyl semimetallic phase and multiple Weyl nodes in the electronic band structure of the films.
