Article
Chemistry, Analytical
Thomas G. Mayerhoefer, Marie Richard-Lacroix, Susanne Pahlow, Uwe Huebner, Rainer Heintzmann, Jurgen Popp
Summary: A new loss function is derived from the symmetry rules of two-dimensional correlation maps, which takes into account causal relations among members of spectra to solve non-linear inverse problems with systematic errors. This correlation-based loss function proves to be insensitive to systematic errors in spectroscopy, leading to accurate fits and corrections for physically meaningful spectra. This method is demonstrated to be superior to conventional correction methods through dispersion analysis of spectra in different substrates.
ANALYTICAL CHEMISTRY
(2022)
Article
Optics
Tobias Pfeiffer, Jens Klier, Georg von Freymann, Daniel Molter
Summary: Nonlinear frequency conversion provides an elegant method for detecting low-energy photons with different wavelengths from the pump wavelength while providing phase information. We propose a phase-sensitive measurement method in the terahertz spectral range using visible light, which enables fast determination of layer thicknesses and achieves phase-resolved detection of terahertz pulses with standard equipment.
Article
Optics
Kazuki Hashimoto, Venkata Ramaiah Badarla, Takuro Ideguchi
Summary: The study introduces a high-speed FTIR spectroscopy technique called phase-controlled Fourier-transform infrared spectroscopy (PC-FTIR) capable of measuring MIR absorption spectra at a rate of above 10 kHz. It demonstrates a high scan rate with a high signal-to-noise ratio for various spectral bandwidths by arbitrarily adjusting the instrumental spectral resolution. This high-speed MIR spectrometer could be particularly useful for measuring non-repetitive fast phenomena and acquiring a large amount of spectral data within a short time.
LASER & PHOTONICS REVIEWS
(2021)
Article
Multidisciplinary Sciences
C. Vaswani, J. H. Kang, M. Mootz, L. Luo, X. Yang, C. Sundahl, D. Cheng, C. Huang, R. H. J. Kim, Z. Liu, Y. G. Collantes, E. E. Hellstrom, I. E. Perakis, C. B. Eom, J. Wang
Summary: The study identifies a hybrid Higgs mode in iron-based high-temperature superconductors and demonstrates its quantum control by light. The tunable coherent oscillation of the complex order parameter in these superconductors suggests the appearance and control of the Higgs mode through light tuning of interband interaction.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Santosh Kumar, Devender Kumar, K. Singh
Summary: This study investigates the effect of K2O on silicate structural units in soda lime silicate glasses. The structural, optical, and mechanical properties of glasses with different compositions are reported. Experimental results show significant changes in physical parameters and structural features upon the addition of K2O. These findings may enable the practical application of these glasses in automobile windshield glasses.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Biochemistry & Molecular Biology
Leonardo Barbosa Leal, Marcelo Saito Nogueira, Jandinay Gonzaga Alexandre Mageski, Thiago Pereira Martini, Valerio Garrone Barauna, Leonardo dos Santos, Luis Felipe das Chagas e Silva de Carvalho
Summary: This study evaluated the accuracy of FTIR for IO diagnosis by collecting FTIR spectra of plasma samples from rats injected with iron-dextran and control rats. A classification model based on principal component analysis and supervised methods achieved 100% accuracy in classifying IO status and identified possible biomolecules related to the vibrational modes detected. This preliminary study took a step towards real-time diagnosis for acute IO or intoxication while expanding knowledge on the pathophysiological changes induced by iron overload.
BIOLOGICAL TRACE ELEMENT RESEARCH
(2021)
Article
Physics, Multidisciplinary
Rui-Xing Zhang, S. Das Sarma
Summary: The quasi-two-dimensional thin films of iron-based superconductors have been established as a new high-temperature platform for hosting intrinsic time-reversal-invariant helical topological superconductivity. Experimental results have shown that an applied electric field can serve as a topological switch for helical Majorana edge modes in FeSC thin films.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Areg Ghazaryan, Ammar Kirmani, Rafael M. Fernandes, Pouyan Ghaemi
Summary: We demonstrate the formation of robust zero-energy modes near magnetic impurities in the iron-based superconductor FeSe1-xTex. The Zeeman field generated by the impurity favors spin-triplet interorbital pairing over the spin-singlet intraorbital pairing found in the bulk. The preferred spin-triplet pairing preserves time-reversal symmetry and exhibits topological properties, with robust, topologically protected zero modes emerging at the boundaries between different pairing states.
Article
Chemistry, Multidisciplinary
Chao Wu, Guangfeng Wei, Xingxing Jiang, Qinke Xu, Zheshuai Lin, Zhipeng Huang, Mark G. Humphrey, Chi Zhang
Summary: The synthesis of noncentrosymmetric (NCS) solids has always been a major challenge. This study demonstrates that the addition of Li2CO3 triggers the formation of an NCS precursor and plays a crucial role in the successful polymorphism transformation. The resulting β-Sc(IO3)3 crystal exhibits promising potential for mid-infrared NLO devices, with strong second-harmonic generation responses, a large optical band gap, sufficient birefringence, and wide optical transparency, which are induced by the optimal alignment of iodate anions. This study reveals the importance of additives in the growth of polar NCS solids and has implications for the strategic design of new NCS polymorphism materials with exceptional NLO properties.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Materials Science, Multidisciplinary
Wen-Fa Chen, Xiao-Ming Jiang, Bin-Wen Liu, Guo-Cong Guo
Summary: For the first time, the AgGaS2 structure evolved into an Ag-based sulfide system integrating dual s-block elements, leading to the discovery of two NLO crystals with excellent properties. These crystals have large band gaps and high NLO coefficients, making them potential candidates for infrared NLO materials.
MATERIALS TODAY PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
R. Idczak, M. Babij, P. Sobota, W. Nowak, R. Konieczny, Z. Bukowski, V. H. Tran
Summary: The interplay of magnetism and superconductivity in Eu(Fe1-xCox)As-2 compounds at low temperatures was systematically studied using polycrystalline samples. The results show that all three compounds exhibit long-range antiferromagnetic order and superconductivity in FeAs layers.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Optics
Yujie Cai, Yu Chen, Xiaoning Xin, Kun Huang, E. Wu
Summary: This study demonstrates a broadband mid-infrared (MIR) single-photon frequency upconversion spectroscopy method. By utilizing the temporal-spectral quantum correlation of non-degenerate photon pairs, the signal is extracted from the noise caused by strong pump, achieving single-photon-level MIR spectral measurement. The system features non-destructive and robust operation, making it an appealing option for biochemical applications.
PHOTONICS RESEARCH
(2022)
Article
Multidisciplinary Sciences
Kohei Matsuura, Masaki Roppongi, Mingwei Qiu, Qi Sheng, Yipeng Cai, Kohtaro Yamakawa, Zurab Guguchia, Ryan P. Day, Kenji M. Kojima, Andrea Damascelli, Yuichi Sugimura, Mikihiko Saito, Takaaki Takenaka, Kota Ishihara, Yuta Mizukami, Kenichiro Hashimoto, Yilun Gu, Shengli Guo, Licheng Fu, Zheneng Zhang, Fanlong Ning, Guoqiang Zhao, Guangyang Dai, Changqing Jin, James W. Beare, Graeme M. Luke, Yasutomo J. Uemura, Takasada Shibauchi
Summary: Iron-chalcogenide superconductors FeSe1-xSx have unique electronic properties and the nature of superconductivity with nematicity is important for understanding unconventional superconductivity. Recent experiments show that the superconducting state in FeSe1-xSx breaks time-reversal symmetry and exhibits ultranodal pair state. The presence of broken TRS and suppressed superfluid density suggests the existence of two different superconducting states separated by the nematic critical point.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Optics
Paul Kaufmann, Helen M. Chrzanowski, Aron Vanselow, Sven Ramelow
Summary: Mid-infrared spectroscopy is an important analytical technique that can be used for a variety of materials. However, there are technical limitations in this field, such as the large noise in mid-IR detectors and the complexity and cost of bright, broadband mid-IR light sources. In this study, we bypass these limitations by using non-degenerate, broadband photon pairs from spontaneous parametric down-conversion in a nonlinear interferometer. We demonstrate spectroscopy in the mid-IR using only a visible solid-state laser and a commercial near-infrared grating spectrometer. The results show short integration times, high signal-to-noise ratios, and high spectral resolution.
Article
Chemistry, Physical
Fabian N. Murrieta-Rico, Joel Antunez-Garcia, Rosario I. Yocupicio-Gaxiola, Jonathan Zamora, Armando Reyes Serrato, Vitalii Petranovskii, Narendra Kumar
Summary: This article presents a one-pot synthesis of iron-modified zeolite X and studies its textural, electrical, and magnetic properties for characterization.
Article
Chemistry, Multidisciplinary
Ratul Paul, Subhash Chandra Shit, Arunima Singh, Roong Jien Wong, Duy Quang Dao, Boby Joseph, Wen Liu, Saswata Bhattacharya, John Mondal
Summary: A newly developed organogel-assisted porous-organic-polymer (POP) supported Cu catalyst (Cu@TpRb-POP) demonstrates improved selectivity and stability in the semi-hydrogenation of alkynes, attributed to the steric hindrance effect and synergistic interaction between the heteroatom-rich POP framework and embedded Cu NPs. Characterization and DFT calculations support these findings.
Article
Chemistry, Physical
Vijaykumar S. Marakatti, Maria Ronda-Lloret, Marian Krajci, Boby Joseph, Carlo Marini, Juan Jose Delgado, Francois Devred, N. Raveendran Shiju, Eric M. Gaigneaux
Summary: Intermetallic compounds (IMCs) are used as precursors to synthesize highly active and stable metal/metal oxide composite catalysts. Controlled modification leads to the formation of Co and Sm2O3 nano crystallites, enhancing catalytic activity. The presence of Co and Sm2O3 active sites in close proximity promotes the simultaneous adsorption or activation of reactants, improving catalytic performance.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Swayam Kesari, Alka B. Garg, Oliver Clemens, Boby Joseph, Rekha Rao
Summary: The effect of high pressure on the structure of orthorhombic Mn-3(VO4)(2) is studied, and a pressure-induced structural phase transition is observed. The new phase can be recovered at ambient conditions.
Article
Engineering, Electrical & Electronic
Daniele Torsello, Michela Fracasso, Roberto Gerbaldo, Gianluca Ghigo, Francesco Laviano, Andrea Napolitano, Michela Iebole, Matteo Cialone, Nicola Manca, Alberto Martinelli, Laura Piperno, Valeria Braccini, Antonio Leo, Gaia Grimaldi, Angelo Vannozzi, Giuseppe Celentano, Marina Putti, Laura Gozzelino
Summary: Ion irradiation of Fe(Se,Te) films was studied to develop Fe(Se,Te) coated conductors. It was found that the films were robust against proton induced damage and an increase in critical current was achieved by introducing pointlike defects. However, damage induced in the substrate also played a crucial role in modifying film properties through variation of the strain exerted on the film.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Physics, Condensed Matter
Govindaraj Lingannan, Boby Joseph, Muthukumaran Sundaramoorthy, Chia Nung Kuo, Chin Shan Lue, Sonachalam Arumugam
Summary: This study investigated the properties of Sc5Rh6Sn18 under high pressure using electrical transport, XRD, and Raman spectroscopy. The results showed that high pressure can enhance the metallic nature and superconducting transition temperature of the material. The cage structure remained stable without any structural phase transition. The findings suggest that increasing pressure may lead to higher superconducting transition temperatures in this pressure range.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Chemistry, Multidisciplinary
Himanshu Nautiyal, Ketan Lohani, Binayak Mukherjee, Eleonora Isotta, Marcelo Augusto Malagutti, Narges Ataollahi, Ilaria Pallecchi, Marina Putti, Scott T. Misture, Luca Rebuffi, Paolo Scardi
Summary: Copper-based chalcogenides are promising thermoelectric materials with high performance, tunable properties, earth abundance, and low toxicity. The study provides an overview of the thermoelectric properties of various polymorphs of Cu2SnS3, Cu2ZnSnS4, and Cu2ZnSnSe4 synthesized by high-energy reactive mechanical alloying. The disordered polymorphs exhibit phonon-glass-electron-crystal behavior and have enhanced electronic transport due to cationic disorder and nanostructuring.
Article
Materials Science, Multidisciplinary
Sushmita Chandra, Janaky Sunil, Prabir Dutta, Koushik Pal, Manisha Samanta, Boby Joseph, Chandrabhas Narayana, Kanishka Biswas
Summary: BiSe, a member of homologous family (Bi2)m (Bi2Se3)n, has gained attention in thermoelectric research due to its ultralow lattice thermal conductivity and promising n-type thermoelectric performance. We have studied the pressure-induced electronic topological transition in BiSe through experimental and theoretical methods, observing clear anomalies in lattice parameters, cell volume, Raman mode shift, and line width data under pressure.
MATERIALS TODAY PHYSICS
(2023)
Article
Chemistry, Inorganic & Nuclear
Priyanka Jain, Gayatri Kumari, Meha Bhogra, Premakumar Yanda, Boby Joseph, Umesh V. Waghmare, Chandrabhas Narayana
Summary: It is found that ZIF-4 undergoes an open to narrow pore transition under vacuum conditions at temperatures below 253K, which is facilitated by C-H...π interactions. The adsorption behavior of N2 and CO2 on ZIF-4 leads to characteristic Raman spectral changes at 293K and 1 atm. The preferred adsorption sites on ZIF-4 are determined to be C-Hs, and low temperature adsorption of N2 leads to shear distortion and volumetric expansion of the ZIF-4 structure.
INORGANIC CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Muthukumaran Sundaramoorthy, Boby Joseph, Govindaraj Lingannan, Pradip Kumar Mondal, Chia Nung Kuo, Chin Shan Lue, Sonachalam Arumugam
Summary: In this study, the transport properties of Sr3Rh4Sn13, Ca3Rh4Sn13, and La3Rh4Sn13 quasi-skutterudites were investigated. The Sr3Rh4Sn13 system showed a pronounced anomaly in electrical resistivity at T* approximately 136 K, while no such anomaly was observed in the other two systems. Structural investigations revealed that all three systems have a cubic structure, with La3Rh4Sn13 showing additional weak reflections. High-pressure measurements on the Sr3Rh4Sn13 system showed a linear decrease of the T* anomaly with pressure and a linear increase of superconducting Tc. The results provide interesting insights into the pressure effects on the quasi-skutterudite X3Rh4Sn13 system.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2023)
Article
Chemistry, Physical
Frederico G. G. Alabarse, Benoit Baptiste, Yoann Guarnelli, Boby Joseph, Julien Haines
Summary: The behavior of porous aluminophosphate AlPO(4)-17 with a hexagonal ionite structure was studied under high pressure using single-crystal and powder X-ray diffraction. In the presence of nitrogen, oxygen, and argon as pressure transmitting media, the guest species were found to enter the pores of AlPO(4)-17, thereby modifying its properties. The collapse and amorphization of AlPO(4)-17 under pressure were suppressed, and the compressibility was reduced due to the insertion of guest molecules. A phase transition to a new hexagonal structure with cell doubling along the a direction was also observed at pressures above 4.4 GPa in the presence of oxygen.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Physics, Condensed Matter
Rajkumar Sokkalingam, Govindaraj Lingannan, Muthukumaran Sundaramoorthy, C. S. Lue, C. N. Kuo, Boby Joseph, Sonachalam Arumugam
Summary: In this study, we report the electrical resistivity and x-ray diffraction characteristics of the ternary Sm2Ru3Ge5 compound, which has an orthorhombic U2Co3Si5-type structure. Our measurements revealed three anomalies in the electrical resistivity, namely at 239.3 K, 27.8 K, and 7 K. The first anomaly corresponds to a charge density wave (CDW) transition, while the last one is associated with an antiferromagnetic (AFM) transition. Additionally, our synchrotron powder diffraction data showed that the system maintains orthorhombic symmetry in the temperature range of 390 to 160 K, but a clear discontinuity in lattice parameters was observed below approximately 233 K, suggesting a close connection between the CDW transition and structural modulation in this system.
SOLID STATE COMMUNICATIONS
(2023)
Article
Physics, Condensed Matter
Ruben Albertini, Salvatore Macis, Andrei A. Ivanov, Alexey P. Menushenkov, Alessandro Puri, Virginia Monteseguro, Boby Joseph, Wei Xu, Augusto Marcelli, Paula Giraldo-Gallo, Ian Randal Fisher, Antonio Bianconi, Gaetano Campi
Summary: In this study, the spatial micro-fluctuations in BaPO units in Ba(Pb-1 Bi-x(x))O-3 crystals were measured using scanning dispersive micro-X-ray absorption near edge structure technique. The results showed substantial differences between the microstrain epsilon and the chemical inhomogeneity x, and different relationships epsilon(x) were observed in samples with different doping levels.
Article
Materials Science, Multidisciplinary
V. Rajaji, Raagya Arora, B. Joseph, Subhajit Roychowdhury, Umesh V. Waghmare, Kanishka Biswas, Chandrabhas Narayana
Summary: We conducted in situ high-pressure studies on the topological insulator TlBiSe2 using Raman scattering, synchrotron x-ray-diffraction experiments, and theoretical calculations. Under hydrostatic pressure, the frequencies of the phonon modes of TlBiSe2's rhombohedral phase systematically increased up to about 7.0 GPa. Anomalies in the linewidths of certain phonon modes at around 2.5 GPa indicated an isostructural electronic transition, attributed to changes in electron-phonon coupling. The observed phonon anomalies and changes in the mirror Chern number confirmed the pressure-induced topological crystalline insulator phase in TlBiSe2 at around 2.5 GPa. Additionally, a reversible structural phase transition was observed above approximately 7.0 GPa. The study suggests the use of hydrostatic pressure as a potential pathway for exploring the topological crystalline insulating phase in TlBiX2 (X = S, Se, Te) compounds with strong spin-orbit coupling.
Article
Materials Science, Multidisciplinary
Srishti Pal, Pallavi Malavi, Arijit Sinha, Anzar Ali, Piyush Sakrikar, Boby Joseph, Umesh V. Waghmare, Yogesh Singh, D. V. S. Muthu, S. Karmakar, A. K. Sood
Summary: The structural evolution of Cu2IrO3 under pressure was investigated using powder X-ray diffraction and Raman scattering. A structural phase transition from monoclinic to triclinic phase was observed, with the triclinic phase exhibiting distorted honeycomb lattice and collapsed interlayer separation. The high-pressure phase showed resilient nonmetallic behavior with reduced resistivity.
Article
Materials Science, Multidisciplinary
Rajesh Jana, Alka B. Garg, Boby Joseph, Brahmananda Chakraborty, K. A. Irshad, Rekha Rao
Summary: In this study, a detailed investigation on the magnetoelectric material Co4Nb2O9 under high pressure is conducted using Raman spectroscopy, synchrotron x-ray diffraction, and dielectric constant measurements combined with density functional theory (DFT) simulations. The results reveal three isostructural phase transitions at around 5.2, 8.5, and 11.5 GPa, as well as spin-phonon coupling and crystal symmetry transitions. These findings provide insights into the structural and electronic properties of Co4Nb2O9 under high pressure.
