Article
Materials Science, Multidisciplinary
E. Campillo, R. Riyat, S. Pollard, P. Jefferies, A. T. Holmes, R. Cubitt, J. S. White, J. Gavilano, Z. Huesges, O. Stockert, E. M. Forgan, E. Blackburn
Summary: The vortex lattice structure in CeCu2Si2 is close to a regular hexagon and is strongly limited by the Pauli paramagnetic effect. At lower temperatures, increasing magnetic field leads to an increase in magnetization of flux line cores, followed by a rapid decrease. Pairing in this material may be due to the effect of magnetic fluctuations rather than a d-wave order parameter.
Article
Materials Science, Multidisciplinary
Jeong-Pil Song, R. Torsten Clay, Sumit Mazumdar
Summary: The success of single-band ladder-based theories in predicting superconductivity in Sr14-xCaxCu24O41 highlights the importance of continuing the search for superconductivity within the single-band Hubbard Hamiltonian. However, recent theoretical works have shown that the multiband ladder Hamiltonian fails to explain the occurrence of superconducting correlations. Experimental observations suggest that superconductivity in Sr14-xCaxCu24O41 only happens under pressure and is accompanied by a transition from one to two dimensions.
Review
Chemistry, Inorganic & Nuclear
Min Wang, Zhao-Yang Li, Ryuta Ishikawa, Masahiro Yamashita
Summary: Research on multifunctional molecular materials with both magnetic bistability and electrical conductivity has expanded in the last two decades, providing materials with practical application prospects. This review presents recent progress on spin crossover and valence tautomerism conductors, focusing on syntheses, strategies, crystal structures, magnetic properties, and conductivities of such materials, as well as the synergistic and cooperative properties of bistability and conductivity.
COORDINATION CHEMISTRY REVIEWS
(2021)
Article
Materials Science, Multidisciplinary
T. Watanabe, R. Okada, K. Tomiyasu
Summary: Ultrasound velocity measurements reveal two types of symmetry-resolved elastic anomaly in the pseudocubic spin-crossover cobaltite LaCoO3 and the lightly Ni-substituted La(Co0.99Ni0.01)O-3. The temperature dependence of the bulk modulus indicates isostructural lattice instability arising from orbital fluctuations, while the temperature dependence of the shear moduli exhibits elasticity crossover arising from spin crossover. The study also shows that the isostructural lattice instability in LaCoO3 is suppressed with Ni substitution, suggesting the suppression of orbital fluctuations.
Article
Chemistry, Multidisciplinary
Xuehui Wei, Jianzong Wang
Summary: The structural evolution of EuNi2P2 under high pressure was studied using a diamond anvil cell and X-ray diffraction. The unique phase transition of this 122-type crystal was observed above 70 GPa, and the stability of the crystal at 9 GPa was confirmed. The crystal remained stable with a tetragonal phase during compression up to 137 GPa.
Article
Chemistry, Multidisciplinary
Li Sun, Nour El Islam Belmouri, Mamadou Ndiaye, Koen Robeyns, Aurelian Rotaru, Kamel Boukheddaden, Yann Garcia
Summary: In this study, two types of 3D porous coordination polymers were synthesized and characterized. These polymers exhibited different magnetic and optical properties during the cooling process. In addition, the cavities in these porous polymers could accommodate chloroform or dichloromethane molecules, further altering the material's properties. These materials have the potential to be used as reusable storage for chemical and gas sensors.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Physics, Multidisciplinary
K. Gotze, M. J. Pearce, M. J. Coak, P. A. Goddard, A. D. Grockowiak, W. A. Coniglio, S. W. Tozer, D. E. Graf, M. B. Maple, P-C Ho, M. C. Brown, J. Singleton
Summary: CeOs4Sb12, a member of the skutterudite family, exhibits an unusual semimetallic low-temperature L-phase. The influence of pressure on the different H-T phase boundaries in CeOs4Sb12 was investigated through electrical transport and megahertz conductivity measurements. The results showed changes in properties such as the decrease in Fermi surface size and marginal suppression of the low-temperature phase under high pressure.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Condensed Matter
Yingying Wang, Kui Wang, Yanmei Ma, Mi Zhou, Hongbo Wang, Guangtao Liu
Summary: This study systematically investigated the pressure dependence of electrical transport and the structural evolution of GeTe, revealing different structural phase transitions and superconductivity transitions at different pressures. The results provide experimental support for understanding the fundamental properties of phase-change materials.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Physics, Condensed Matter
Esteban I. Paredes Aulestia, Xinyou Liu, Yiu Yung Pang, Chun Wa So, Wing Chi Yu, Swee K. Goh, Kwing To Lai
Summary: Charge density wave (CDW) instability is commonly found in superconductors, but its relationship with the pairing of electrons remains unclear. This study investigates a BiS2 superconductor and reveals the presence of CDW and superconducting transitions in the temperature-pressure phase diagram, suggesting a possible connection between CDW and electron pairing.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Chemistry, Multidisciplinary
Thilini K. Ekanayaka, Ping Wang, Saeed Yazdani, Jared Paul Phillips, Esha Mishra, Ashley S. Dale, Alpha T. N'Diaye, Christoph Klewe, Padraic Shafer, John Freeland, Robert Streubel, James Paris Wampler, Vivien Zapf, Ruihua Cheng, Michael Shatruk, Peter A. Dowben
Summary: The [Co(SQ)(2)(4-CN-py)(2)] complex shows dynamic effects at various temperatures, with the orbital moment exhibiting a nonzero critical field for net alignment of magnetic moments, in contrast to the spin moment behavior.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Inorganic & Nuclear
Dmitry A. Zamyatin, Elizaveta A. Pankrushina, Sergey V. Streltsov, Yuri S. Ponosov
Summary: We investigated the lattice dynamics of AuAgTe4 mineral using Raman spectroscopy and first-principle calculations over a wide temperature and pressure range. The experimental spectrum at ambient pressure matches well with the calculation data. The temperature dependence of the phonon self-energies indicates an anharmonic mechanism and negligible electron-phonon interaction at low temperatures. A structural phase transition was observed at 4-6 GPa, in agreement with theoretical predictions. At higher pressures, evidence of local structural disorder was found, allowing for the experimental observation of the density of vibrational states of AuAgTe4, which exhibits superconductivity under pressure.
Article
Chemistry, Multidisciplinary
Lucia Pineiro-Lopez, Francisco-Javier Valverde-Munoz, Elzbieta Trzop, M. Carmen Munoz, Maksym Seredyuk, Javier Castells-Gil, Ivan da Silva, Carlos Marti-Gastaldo, Eric Collet, Jose Antonio Real
Summary: The coordination polymer exhibits a binary reversible switch between low-temperature multi-step spin crossover, featuring a unique magnetic behavior with interpenetrated and coexisting structures.
Article
Materials Science, Ceramics
Hao Liang, Ruiqi He, Weitong Lin, Lei Liu, Xiaojun Xiang, Zhengang Zhang, Shixue Guan, Fang Peng, Leiming Fang
Summary: The study demonstrates that high-strain-induced plastic deformation in ceramic materials leads to the formation of a lamellar sub-grain structure with high-density dislocations and the evolution of dislocations into low-angle grain boundaries. The high density of states at the Fermi level and the strong hybridization between Mo-4d and C-2p orbitals contribute to the superconductivity and hardness of the material. The strain-induced defect structure (dislocations and low-angle grain boundaries) enhances the intrinsic structure of the material.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Rajesh Tripathi, D. T. Adroja, M. R. Lees, A. Sundaresan, S. Langridge, A. Bhattacharyya, V. K. Anand, D. D. Khalyavin, J. Sannigrahi, G. Cibin, A. D. Hillier, R. Smith, H. C. Walker, Y. Muro, T. Takabatake
Summary: In this study of Ce(Fe1-xIrx)(2)Al-10, it was found that a small amount of Ir substitution for Fe can suppress the low-temperature energy gap, leading to a metallic ground state. Furthermore, the collapse of the charge or transport gap is faster with Ir substitution.
Article
Chemistry, Multidisciplinary
Sven Johannsen, Sascha Ossinger, Troels Markussen, Felix Tuczek, Manuel Gruber, Richard Berndt
Summary: The behavior of spin crossover compound on a silver surface was investigated, revealing that two molecules in tetramers can switch states by current injection with significantly higher yields compared to other systems. The other two molecules remain unchanged, but can be used as contacts for switching neighboring molecules. A model of tetramer structure was proposed and validated through experiments.
Article
Chemistry, Physical
Wojciech Salamon, Lukasz Gondek, Jaroslaw Kanak, Marcin Sikora, Jakub Pawlak, Michal Szuwarzynski, Pawel A. Krawczyk, Marcin Perzanowski, Krzysztof Mackosz, Antoni Zywczak
Summary: This study presents the spontaneous growth of self-assembled epitaxial nanostructures of BiFeO3 (BFO) using Pulsed Laser Deposition. By analyzing the structures, the growth routes of BFO nanostructures were determined and the relationship between their morphology and structural properties was established.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Katarzyna Plachete, Anna Kot, Joanna Banas-Gac, Marcin Zajac, Marcin Sikora, Marta Radecka, Katarzyna Zakrzewska
Summary: Titanium oxide thin films were deposited using rf magnetron sputtering, and their crystallographic structure, phase composition, morphology, and optical properties were extensively studied. It was found that the microstructure of the films changed with the O2 flow ratio, and promising photoanode materials for green hydrogen generation were identified.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
V. Bilovol, M. Sikora, K. Berent
Summary: (100-x)SrFe12O19/(x)CoFe2O4 composites with different fractions of hexagonal and cubic ferrite powders as precursors were prepared by ball milling, where x = 10, 20, 30, 40 wt%. The as-prepared composites were annealed and analyzed using X-ray diffraction for structural analysis and energy dispersive X-ray analysis for elemental analysis. The magnetic properties were studied through magnetization measurements, direct current demagnetization, and isothermal remanence magnetization measurements. The composite sample with 10 wt% CoFe2O4 exhibited the highest energy product of 10.9 kJ/m3, which was approximately 20% higher than that of pristine SrFe12O19. The improved magnetic properties of the composite can be explained by the presence of exchange coupling effect extracted from Henkel plots.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Physics, Multidisciplinary
M. Zhu, D. J. Voneshen, S. Raymond, O. J. Lipscombe, C. C. Tam, S. M. Hayden
Summary: In this study, we demonstrate through inelastic neutron scattering that there are low-energy collective spin fluctuations near the superconducting critical temperature and near the doping p* in cuprate superconductors. These spin fluctuations are attributed to the collapse of the pseudogap combined with an underlying tendency to magnetic order. They exist across the superconducting phase diagram and may be related to the strange metal behavior observed in overdoped cuprates.
Article
Physics, Multidisciplinary
Jakub Szlachetko, Jacek Szade, Edyta Beyer, Wojciech Blachucki, Piotr Ciochon, Paul Dumas, Kinga Freindl, Grzegorz Gazdowicz, Sebastian Glatt, Krzysztof Gula, Josef Hormes, Paulina Indyka, Agnieszka Klonecka, Jacek Kolodziej, Tomasz Kolodziej, Jozef Korecki, Pawel Korecki, Filip Kosiorowski, Karolina Kosowska, Grzegorz Kowalski, Maciej Kozak, Paulina Koziol, Wojciech Kwiatek, Danuta Liberda, Henning Lichtenberg, Ewa Madej, Anna Mandziak, Andrzej Marendziak, Krzysztof Matlak, Alexey Maximenko, Pawel Nita, Natalia Olszowska, Roman Panas, Ewa Partyka-Jankowska, Marcel Piszak, Alexander Prange, Michal Rawski, Maciej Roman, Marcin Rosmus, Marcin Sikora, Joanna Slawek, Tomasz Sobol, Katarzyna Sowa, Nika Spiridis, Joanna Stepien, Magdalena Szczepanik, Tomasz Slezak, Tolek Tyliszczak, Grzegorz Wazny, Jaroslaw Wiechecki, Dorota Wilgocka-Slezak, Barbara Wolanin, Pawel Wrobel, Tomasz Wrobel, Marcin Zajac, Adriana Wawrzyniak, Marek Stankiewicz
Summary: The SOLARIS synchrotron in Krakow, Poland is a third-generation light source operating at medium electron energy. It was first observed in 2015, and experiments using soft X-ray energies were conducted in 2018. SOLARIS is now expanding its operation to include hard X-rays and is continuously developing its beamlines and infrastructure. This article provides an overview of the SOLARIS synchrotron design, including the beamlines, research infrastructure, performance parameters, and future development plans.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Nanoscience & Nanotechnology
Sebastian Svanstrom, Alberto Garcia Fernandez, Tamara Sloboda, T. Jesper Jacobsson, Fuguo Zhang, Fredrik O. L. Johansson, Danilo Kuhn, Denis Ceolin, Jean -Pascal Rueff, Licheng Sun, Kerttu Aitola, Hakan Rensmo, Ute B. Cappel
Summary: In this study, the band alignment and interfacial electric field variations of a fully functional lead halide perovskite solar cell structure under operating conditions were measured directly using hard X-ray photoelectron spectroscopy (HAXPES). The results showed that 70% of the photovoltage was generated at the back contact, with equal contributions from the hole transport material/gold interface and the perovskite/hole transport material interface.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Biochemistry & Molecular Biology
Joshua A. Stoll, Dorota Lachowicz, Angelika Kmita, Marta Gajewska, Marcin Sikora, Katarzyna Berent, Marek Przybylski, Stephen E. Russek, Zbigniew J. Celinski, Janusz H. Hankiewicz
Summary: The aim of this project is to fabricate hydrogen-rich silicone doped with magnetic nanoparticles for use as a temperature change indicator in MRI-guided thermal ablations. The nanoparticles were synthesized directly in a medical-grade silicone polymer solution to avoid clustering. The synthesized nanoparticles exhibited superparamagnetic behavior and can potentially be used as a temperature indicator in high-temperature MRI-guided ablations.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Editorial Material
Physics, Multidisciplinary
Dai Aoki, Ilya Sheikin, Alix McCollam, Jun Ishizuka, Youichi Yanase, Gerard Lapertot, Jacques Flouquet, Georg Knebel
Summary: In this study, de Haas -van Alphen (dHvA) experiments were performed in the spintriplet superconductor UTe2, revealing the presence of three fundamental dHvA frequencies and suggesting the existence of cylindrical Fermi surfaces. The possibility of small pocket Fermi surfaces associated with extremely heavy masses cannot be fully excluded.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2023)
Article
Multidisciplinary Sciences
Edwin Herrera, Isabel Guillamon, Victor Barrena, William J. Herrera, Jose Augusto Galvis, Alfredo Levy Yeyati, Jan Rusz, Peter M. Oppeneer, Georg Knebel, Jean Pascal Brison, Jacques Flouquet, Dai Aoki, Hermann Suderow
Summary: Two-dimensional electronic states are often observed at surfaces of wide-band metals, resulting from confinement by nanoscale closed geometries. In this study, we used scanning tunnelling microscopy to investigate atomically flat terraces on the surfaces of a heavy-fermion superconductor, URu2Si2. We observed two-dimensional heavy fermions with quantized energy levels separated by a fraction of a millielectronvolt, suggesting a new route to studying quantum-well states in strongly correlated quantum materials.
Article
Physics, Multidisciplinary
A. Rosuel, C. Marcenat, G. Knebel, T. Klein, A. Pourret, N. Marquardt, Q. Niu, S. Rousseau, A. Demuer, G. Seyfarth, G. Lapertot, D. Aoki, D. Braithwaite, J. Flouquet, J. P. Brison
Summary: The recently discovered superconductor UTe2, with a superconducting transition temperature Tc between 1.5 and 2 K, has raised great attention due to its strong suspicion of spin-triplet and topological superconductivity. The properties of UTe2 under a magnetic field are also remarkable, showing field-reinforced and field-induced superconducting phases. This study provides the first complete thermodynamic determination of the phase diagram for fields applied along different crystallographic directions, revealing a strong negative curvature of the upper critical field along the easy axis and the existence of a phase transition line within the superconducting phase.
Article
Physics, Multidisciplinary
Fabrice Wilhelm, Jean-Pierre Sanchez, Daniel Braithwaite, Georg Knebel, Gerard Lapertot, Andrei Rogalev
Summary: This article investigates the electronic structure of UTe2 through two types of X-ray spectroscopy, revealing unusual features and pressure dependence of the 5f electron count. This understanding is crucial for fully comprehending its superconducting properties.
COMMUNICATIONS PHYSICS
(2023)
Article
Physics, Applied
Vitaliy Bilovol, Marcin Sikora, Sona Lisnikova, Jan Zukrowski, Katarzyna Berent, Marta Gajewska
Summary: Temperature is a crucial factor in the synthesis of nanoparticles, and it has a significant impact on the atomic arrangement in the lattice. In the system of magnetically hard CoFe2O4 spinel ferrite, the distribution of cations directly affects the magnetic properties of the sample. Through various tests, the behavior of co-precipitation synthesis products at different sintering temperatures was studied, revealing that the lower the sintering temperature, the lower the inversion degree and the more Co ions tend to occupy the tetrahedral sites.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
N. Biniskos, F. J. dos Santos, M. dos Santos Dias, S. Raymond, K. Schmalzl, P. Steffens, J. Persson, N. Marzari, S. Bluegel, S. Lounis, T. Brueckel
Summary: In this study, we investigate the spin-excitation spectrum of bulk Mn5Si3 using inelastic neutron scattering measurements and density functional theory calculations. We find that the spin dynamics of each phase in Mn5Si3 is robust against any combination of temperature and magnetic field. The high-energy spin dynamics exhibit distinctive characteristics of either spin waves or broad fluctuation patterns in different phases.
Article
Materials Science, Multidisciplinary
N. S. Dhami, V. Baledent, O. Bednarchuk, D. Kaczorowski, S. R. Shieh, J. M. Ablett, J. -p. Rueff, J. P. Itie, C. M. N. Kumar, Y. Utsumi
Summary: We investigated the pressure effects on the electronic and crystal structures of EuCoGe3, a noncentrosymmetric antiferromagnet. By performing high-pressure fluorescence detected near-edge x-ray absorption spectroscopy and synchrotron powder x-ray diffraction, we found that the valence state of Eu changes under pressure, while the Co and Ge spectra remain unchanged. The lattice parameters of EuCoGe3 decrease with increasing pressure, but the crystal symmetry remains unchanged.
Article
Materials Science, Multidisciplinary
V. Baledent, A. Vaunat, S. Petit, L. Nataf, S. Chattopadhyay, S. Raymond, P. Foury-Leylekian
Summary: This paper investigates the physical properties of the type-II multiferroic GdMn2O5 material using neutron scattering, electric polarization, and magnetization measurements. A complex (T,H) phase diagram is observed, with a field-induced magnetic transition occurring at around 11 T at low temperature. In the high-field phase, an additional electric polarization along both the a and b directions is observed, which is allowed by symmetry but has never been experimentally observed before. While the magnetic properties return to their initial states after the field is driven back to zero, the polarization along the a direction shows a significant increase. This behavior, observed for all directions of the magnetic field, represents a novel and striking manifestation of magnetoelectric coupling, resulting in the establishment of a new ground state at zero magnetic field.
