Article
Chemistry, Physical
Bangmin Zhang, Lijun Wu, Xin Feng, Dongyang Wang, Xiao Chi, Guozhi Chai, Ping Yang, Jun Ding, Jiaguang Han, Jingsheng Chen, Yimei Zhu, Gan Moog Chow
Summary: This study introduced ordered oxygen vacancies through self-structural optimization, forming a ferromagnetic charge-ordering/charge-density-wave state in La0.7Sr0.3MnO3, with properties influenced by magnetic field, temperature, and superlattice configuration, and high magnetic field inducing re-entrance to a ferromagnetic insulator state.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Article
Materials Science, Multidisciplinary
Palaka Subhashini, Betarayan Munirathinam, R. Venkatesh, V Ganesan
Summary: The effect of doping exchange of monovalent alkaline metal ions on the structural, electrical and magnetotransport properties of manganite ceramics is investigated. The doped samples show differences in their structural, electrical and magnetotransport behavior compared to the undoped samples.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Physics, Applied
Heidemarie Schmidt
Summary: There is an urgent need for multifunctional materials that can reduce the energy demands of microelectronic devices. The ferroelectric manganites have shown the spontaneous formation of 1D closed and open loop vortices, making them applicable in various fields such as artificial intelligence, light-emitting materials, and thermoelectrics. It is expected that these materials are highly conducting at room temperature.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Ram Prakash Pandeya, Anup Pradhan Sakhya, Sawani Datta, Tanusree Saha, Giovanni De Ninno, Rajib Mondal, C. Schlueter, A. Gloskovskii, Paolo Moras, Matteo Jugovac, Carlo Carbone, A. Thamizhavel, Kalobaran Maiti
Summary: The study reveals the presence of coupling among conduction electrons in the core level spectra of the superconductor CaFe1.9Co0.1As2, with features evolving with cooling. This highlights the importance of such interactions in Fe-based systems and their relevance to unconventional superconductivity.
Article
Materials Science, Ceramics
K. Swetha, S. Bharadwaj, J. Arout Chelvane, Hasan Afzal, R. Venkatesh, K. V. Siva Kumar, Kalyana Lakshmi Yanapu
Summary: In this study, a series of manganites with compositional formula La0.67Sr0.33Mn1+/- xO3 were synthesized to investigate the effect of manganese non-stoichiometry. The results showed that an increase in manganese non-stoichiometry leads to the coexistence of ferromagnetic and antiferromagnetic interactions, and affects the magnetotransport properties.
CERAMICS INTERNATIONAL
(2022)
Article
Physics, Applied
E. Lakhal, A. Amira, R. Chihoub, N. Soylu, S. P. Altintas, A. Varilci, C. Terzioglu
Summary: In this study, manganite ceramics of Sm0.7-xCexSr0.3MnO3 were prepared by a citrate sol-gel chemical route. Doping caused changes in lattice parameters and cell volume, as well as a slight increase in grain size. Magnetoresistance for a 5 T magnetic field was enhanced by doping, with the highest value increasing from 66.70% to 97.96% for x = 0 and x = 0.3, respectively.
JOURNAL OF LOW TEMPERATURE PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
O. G. Udalov, I. S. Beloborodov
Summary: This study discusses the magnetic oxide/heavy metal oxide hybrid film on a substrate with high dielectric constant, using the double exchange model to describe the system behavior. The interface between the two oxide films generates a unique Rashba spin-orbit interaction, resulting in phase separation in the magnetic film. The combination of phase separation and spin-orbit coupling leads to the formation of electrically charged magnetic clusters with skyrmions, where suitable cluster sizes for skyrmion formation only occur on a substrate with a high dielectric constant.
Article
Materials Science, Multidisciplinary
Fatih Denbri, Nabil Mahamdioua, Faiza Meriche, Nevin Soylu Koc, Cabir Terzioglu, Ahmet Varilci, Sevgi Polat Altintas
Summary: The study investigated the structural, microstructural, and magneto-transport properties of polycrystalline La0.5Sm0.2Ca0.3-x PbxMnO3 samples, revealing the significant impact of Pb doping on their resistivity and magnetoresistance properties. Additionally, it was found that the lattice parameters of the samples increase with higher Pb content.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Physical
Shohaib Abass, Khalid Sultan, Sujay Chakravarty, R. J. Choudhary
Summary: In this study, structural and electronic modifications in Sm2NiMnO6 by Sr doping were investigated. Sr doping led to a decrease in grain size and did not change the phase of the compound. With increasing Sr concentration, the dielectric constant decreased, the dielectric loss increased, and the magnetic ordering temperature increased while the saturation magnetization decreased.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Multidisciplinary Sciences
R. Wawrzynczak, S. Galeski, J. Noky, Y. Sun, C. Felser, J. Gooth
Summary: This study compares the observation of quasi-quantized plateau-like features in the Hall conductivity of n-type bulk semiconductor InAs with the predicted results of 3D quasi-quantized Hall effect (QQHE). The experimental results confirm the presence of 3D QQHE in materials with small Fermi surfaces under sufficiently strong magnetic fields.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Multidisciplinary
Suranjan K. Paul, John M. Herbert
Summary: Liquid microjet photoelectron spectroscopy is commonly used to measure VIEs of aqueous solutes, with sensitivity to bulk versus interfacial solvation environments. Computational studies of aqueous-phase VIEs for inorganic anions show excellent agreement with experiment, regardless of simulation data restrictions. Sensitive to ion-water hydrogen bonding, short-range solvation structure is similar in both environments, making it impossible to discriminate between the two based on VIE.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Geochemistry & Geophysics
Meredith K. Elrod, Stephen Bougher, Kali Roeten, Kenneth Arnold
Summary: Using the NGIMS instrument on board MAVEN, data from MY 32, 34, and 35 were analyzed to study the He bulge during the northern winter solstice and its interaction with the planet encircling dust event (PEDE-2018). The observations confirmed the seasonal migration of the He bulge and its absence during the PEDE, indicating a direct impact on upper atmospheric circulation.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2023)
Article
Instruments & Instrumentation
D. Drung, C. Krause
Summary: The dual-mode auto-calibrating resistance thermometer (DART) combines resistance thermometry and Johnson noise thermometry methods to achieve fast and accurate temperature measurements. The instrument directly measures the spectral density of thermal noise and corrects for parasitic effects and amplifier noise, providing stable and reliable temperature readings over time and varying temperatures. The system, designed for industrial temperature ranges, is expected to reach uncertainties suitable for accurate measurements traceable to international temperature standards.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Article
Materials Science, Multidisciplinary
Md Shafiqul Islam, Daisuke Morikawa, Shigeki Yamada, Bikas Aryal, Kenji Tsuda, Masami Terauchi
Summary: The crystal structures of coexisting polar and nonpolar phases in A-site ordered NdBaMn2O6 were investigated using a combination of CBED and DFT calculations. The symmetry analysis of CBED patterns revealed the presence of two crystallographic distinct phases with polar and nonpolar space groups. DFT calculations showed that the comparable total energies of the two phases could explain their coexistence.
Article
Physics, Applied
Jianliang Su, Chengwei Cai, Mei Ji
Summary: In this paper, [La0.8Ca0.2MnO3/La0.5Ca0.5MnO3](20) superlattice films with different La0.8Ca0.2MnO3 layer thicknesses were prepared by pulsed laser deposition. The crystal structures, strain, magnetic hysteresis loops, and magnetization versus temperature curves of the films were measured. The magnetic properties were comprehensively analyzed based on the strain state and magnetic phases.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2023)
Article
Materials Science, Multidisciplinary
Ibtihal Belal, Faiza Meriche, Nabil Mahamdioua, Fatih Denbri, Sevgi Polat-Altintas, Cabir Terzioglu, Jose Alonso Alonso, Jose Luis Martinez
Summary: The structural, microstructural, magnetic, electrical, and magneto-transport properties of La0.7Ca0.18Ba0.12Mn0.95Sn0.05O3 manganite powders prepared by the solid-state method were investigated. Two quenching processes, air quenching and quenching at 77K in liquid nitrogen, were performed on the samples. X-ray diffraction analysis showed that the samples crystallized in an orthorhombic structure, while scanning electron microscopy revealed granular characteristics. The magnetic measurements indicated a paramagnetic-ferromagnetic transition, and the magnetoresistance slightly increased in the sample quenched to 77K in liquid nitrogen.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Chemistry, Physical
Joao E. F. S. Rodrigues, Javier Gainza, Federico Serrano-Sanchez, Romualdo S. Silva Jr, Catherine Dejoie, Norbert M. Nemes, Oscar J. Dura, Jose L. Martinez, Jose Antonio Alonso
Summary: In this study, Gd-filled skutterudite GdxCo4Sb12 was prepared under high pressure and moderate temperature. The structural characterization revealed a filling fraction of x = 0.033(2) and an average bond length of 3.3499(3) angstrom. The lattice thermal expansion and Debye temperature were determined, showing that the application of the harmonic Debye theory underestimates the Debye temperature in skutterudites. The presence of Gd atom contributed to an ultra-low thermal conductivity and high thermoelectric efficiency.
Article
Materials Science, Multidisciplinary
J. E. Rodrigues, A. D. Rosa, J. Lopez-Sanchez, E. Sebastiani-Tofano, N. M. Nemes, J. L. Martinez, J. A. Alonso, O. Mathon
Summary: Understanding the electronic and structural changes in nickelates with a perovskite structure is crucial for their application as industrial devices. This study focuses on PrNiO3 and investigates the structural changes at a local level using X-ray absorption spectroscopy. The results reveal the presence of different phases and the coupling behavior between spin configuration and phonons. This approach provides new opportunities for similar studies in related materials.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Crystallography
Javier Gainza, Federico Serrano-Sanchez, Joao E. F. S. Rodrigues, Oscar J. J. Dura, Brenda Fragoso, Mateus M. M. Ferrer, Norbert M. M. Nemes, Jose L. Martinez, Maria T. Fernandez-Diaz, Jose A. Alonso
Summary: Among chalcogenide thermoelectric materials, SnTe is a promising alternative to toxic PbTe for intermediate temperature applications. Pure polycrystalline SnTe was obtained by arc melting and its structural evolution was studied using temperature-dependent neutron powder diffraction (NPD) from room temperature up to 973 K. The sample exhibited a cubic crystal structure (space group Fm-3m) with pronounced displacement parameters for Te atoms. The structural analysis allowed the determination of Debye model parameters and provided insights into the Sn-Te chemical bonds. SEM images revealed nanostructuration in layers below 30 nm, contributing to a reduced thermal conductivity of 2.5 W/m center dot K at 800 K. The SPS treatment appeared to reduce Sn vacancies, resulting in decreased carrier density, increased Seebeck coefficient (up to 60 mu V K-1 at 700 K), and nearly doubled weighted mobility compared to the as-grown sample.
Article
Crystallography
Joao Elias F. S. Rodrigues, Javier Gainza, Federico Serrano-Sanchez, Norbert M. Nemes, Oscar J. Dura, Jose Luis Martinez, Jose Antonio Alonso
Summary: A novel Eu-filled skutterudite has been synthesized under high-pressure conditions, and its structure was studied by high-resolution synchrotron X-ray diffraction. The thermal conductivity of this alloy was measured to be 0.82 W m(-1) K-1, lower than that of other filled skutterudites.
ZEITSCHRIFT FUR KRISTALLOGRAPHIE-CRYSTALLINE MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Fatima Zohra Bouasla, Nabil Mahamdioua, Jose A. Alonso, Jose L. Martinez, Faiza Meriche, Cabir Terzioglu, Sevgi Polat Altintas
Summary: The orthochromites La0.7RE0.1Ca0.2CrO3 (RE = Nd, Sm, and Eu) with orthorhombic perovskite structure were studied for their structural, microstructural, optical, and magnetic properties. The results showed different bandgap energy values for Nd, Sm, and Eu doped samples, explaining the creation of localized states. The investigation also revealed the refractive index, Urbach energy, optical conductivity, and magnetic behavior of the samples.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Radjia Belguet, Nabil Mahamdioua, Faiza Meriche, Jose A. Alonso, Jose L. Martinez, Fatih Denbri, Sevgi Polat-Altintas, Cabir Terzioglu
Summary: Hole-doping double-layered manganites with the formula La1:0Gd(0.2-x)PbxCa1.2Sr0.6Mn2O7 (x = 0, 0.1, and 0.2) were prepared and characterized. The samples exhibited a tetragonal structure with an I4/mmm space group. Micrographs obtained using a scanning electron microscope showed a granular and porous structure with spherical grains. Fourier-transform infrared (FTIR) analysis confirmed the presence of characteristic vibrational bands. Electrical resistivity measurements revealed a decrease in resistivity with increasing Pb concentrations. The samples exhibited magnetic phase changes and displayed potential as temperature and magnetic sensors.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Physical
Madeleine Han, Isabel Gomez-Recio, Daniel Gutierrez Martin, Nathaly Ortiz Pena, Maria Luisa Ruiz-Gonzalez, Mohamed Selmane, Jose M. Gonzalez-Calbet, Ovidiu Ersen, Andrea Zitolo, Benedikt Lassalle-Kaiser, David Portehault, Christel Laberty-Robert
Summary: Manganese and cobalt perovskite oxides are highly active electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), respectively. The role of cationic composition and charge state in these perovskites in the mechanism of oxygen electrocatalysis for ORR and OER have been questioned. The results suggest that cationic substitutions and control of cationic vacancies can tune the rate-determining steps of the electrocatalytic cycles.
Article
Chemistry, Physical
Feriel Zdiri, Jose Maria Alonso, Taoufik Mnasri, Patricia de la Presa, Irene Morales, Jose Luis Martinez, Rached Ben Younes, Pilar Marin
Summary: We investigated the properties of Pr-0.7 Sr-0.3 Mn(1-x)Cox O-3 nanopowders synthesized using the Pechini Sol-gel method. X-ray diffraction revealed an orthorhombic crystal structure for all samples. Magnetic measurements showed a transition from ferromagnetic to paramagnetic with increasing temperature, and the Curie temperature decreased with increasing Co concentration. Electrical resistivity measurements indicated metallic behavior at low temperature and semiconductor behavior above a certain temperature, with significant magnetoresistance values for all samples.
Article
Chemistry, Multidisciplinary
Antonio Hernando, M. Luisa Ruiz-Gonzalez, Omar Diaz, Jose M. Alonso, Jose L. Martinez, Andres Ayuela, Jose M. Gonzalez-Calbet, Raquel Cortes-Gil
Summary: The presence of La-Mn vacancies in LaMnO3 nanoparticles leads to a significant change in conductivity behavior. The sample remains an insulator overall, showing typical thermal activation mechanism at high temperatures, but exhibits high magnetoconductivity below 200 K. The activation energy decreases linearly with the square of the reduced magnetization and disappears when the sample is magnetized at saturation. Therefore, electron hopping between Mn3+ and Mn4+ contributes largely to the conductivity below the Curie temperature. The influence of the applied magnetic field on conductivity also supports the hypothesis of hopping contribution, and the electric behavior can be explained as an increase in hopping probability via spin alignment.
Article
Chemistry, Multidisciplinary
Yang Song, Isabel Gomez-Recio, Anissa Ghoridi, Fernando Igoa Saldana, Daniel Janisch, Capucine Sassoye, Vincent Dupuis, David Hrabovsky, M. Luisa Ruiz-Gonzalez, Jose M. Gonzalez-Calbet, Sandra Casale, Andrea Zitolo, Benedikt Lassalle-Kaiser, Christel Laberty-Robert, David Portehault
Summary: By controlling the reaction temperature in molten salts, we designed heterostructured cobalt silicide nanoparticles to exhibit magnetic and catalytic properties in silicon-based materials. The core-shell nanoparticles showed increased ferromagnetism and acted as efficient precatalysts for alkaline water oxidation, displaying high and stable electrocatalytic activity for oxygen evolution reaction. This work demonstrates the potential of designing heterostructured nanocrystals of covalent intermetallic compounds with rich interface-based physical properties and reactivity.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Carmen Abia, Carlos A. Lopez, Javier Gainza, Joao Elias F. S. Rodrigues, Brenda Fragoso, Mateus M. Ferrer, Norbert M. Nemes, Oscar J. Dura, Jose Luis Martinez, Maria Teresa Fernandez-Diaz, Jose Antonio Alonso
Summary: Rubidium di-tin pentabromide (RbSn2Br5) is a lead-free alternative material with high crystallinity that can be easily synthesized using a ball milling procedure. It has the potential to be used as a photovoltaic and optoelectronic material due to its improved stability and tolerance to ambient conditions. Experimental studies have shown that it has high electronic conductivity and Seebeck coefficient, as well as low thermal conductivity.
Article
Chemistry, Multidisciplinary
Carmen Abia, Carlos A. Lopez, Javier Gainza, Joao Elias F. S. Rodrigues, Maria T. Fernandez-Diaz, Eva Cespedes, Jose Luis Martinez, Jose Antonio Alonso
Summary: The search for lead-free materials for optoelectronic applications is a current research focus in the field of environment-friendly energy transition. In this study, we investigated the substitution of toxic Pb2+ with Cu2+ in all-inorganic CsPbBr3 perovskite, and explored the CsCuBr3 halide with little previous research. A mechanically-synthesized CsCuBr3 specimen was obtained and characterized by calorimetric and structural analysis techniques. The results revealed a structural phase transition and the presence of magnetic coupling between Cu2+ spins.
Article
Chemistry, Inorganic & Nuclear
Raluca Loredana Vasile, Romualdo S. Silva Jr, Eva Cespedes, Jose L. Martinez, Enrique Gutierrez-Puebla, M. Angeles Monge, Felipe Gandara
Summary: This study investigates the magnetocaloric effect in a series of rare-earth-based metal-organic frameworks (MOFs). The results show that the choice of rare-earth cation and structural parameters have a significant impact on the magnetic entropy change and cooling power. The study also reveals the influence of hydrostatic pressure on these properties. The findings suggest a new design strategy for efficient cooling devices based on engineered MOF systems.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Javier Gainza, Orlando N. Guinazu, Eva Cespedes, Horacio Falcon, Jose Luis Martinez, Jose Antonio Alonso
Summary: In this study, MnIn2S4 polycrystalline samples with tunable degree of inversion were prepared using a rapid high-pressure synthetic method. The crystal structure refinement showed a positive correlation between the inversion degree and properties such as band gap and magnetic behavior.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
