Article
Chemistry, Physical
Fang Kang, Xiaorong Ma, Lixue Zhang, Tao Li, Xiaopei Zhu, Zepeng Wang, Qinzhao Sun, Pu Mao, Tianran Zhang, Jiping Wang
Summary: The study focuses on designing and optimizing high temperature piezoelectric ceramics with large electromechanical properties for actuators in harsh environments. BiFeO3-BaTiO3 based ceramics show promise due to their high electromechanical properties and high Curie temperature. By doping K ions into the A-sites of the ceramics, positive temperature-dependent electromechanical properties are achieved, with excellent performance observed in the 0.63B0.9975K0.0025F-0.37BT ceramic.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Javier Blasco, Gloria Subias, Jose Luis Garcia-Munoz, Francois Fauth, Joaquin Garcia
Summary: In this paper, a complete structural study of the YBaMn2O6 compound with successive phase transitions is conducted, revealing distinct structural features and arrangements of Mn sites as well as increasing charge differences. The compound undergoes three consecutive phase transitions, with the emergence of new structural characteristics and increased charge segregation, indicating specific and unique properties.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Materials Science, Multidisciplinary
J. Blasco, G. Subias, J. L. Garcia Munoz, F. Fauth, M. C. Sanchez, J. Garcia
Summary: In this study, the charge-orbital ordering and magnetic phase transitions in A-site ordered SmBaMn2O6 perovskite were investigated using synchrotron radiation x-ray powder diffraction and symmetry-adapted modes analysis. Successive phase transitions in charge, spin, and lattice degrees of freedom were observed with decreasing temperature. The two charge-ordered phases show differences in their stacking sequence along the c axis, leading to controversy in the literature.
Article
Materials Science, Multidisciplinary
G. Subias, J. Blasco, V. Cuartero, S. Lafuerza, L. Simonelli, G. Gorni, M. Castro, J. Garcia
Summary: We investigated the temperature dependence of Mn local structure in A-site ordered RBaMn2O6 perovskites and their disordered counterparts R0.5Ba0.5MnO3 using XES and XAS. The results show that the MnO6 octahedron in LaBaMn2O6 remains regular at all temperatures, while a local distortion develops with decreasing R ionic radius in the ordered samples NdBaMn2O6, SmBaMn2O6, and YBaMn2O6. Charge segregation between nonequivalent Mn sites is confirmed in the polar phase of Sm and Y ordered samples. The study suggests a displacive mechanism for the charge-localization and polar transitions in Nd and Sm ordered samples, while a combination of displacive and order-disorder contributions is revealed for YBaMn2O6.
Article
Chemistry, Inorganic & Nuclear
Alexei A. Belik, Dmitry D. Khalyavin, Yoshitaka Matsushita, Kazunari Yamaura
Summary: A new member of A-site columnar-ordered A(2)A'A'' B4O12 quadruple perovskites Y2CuGaMn4O12 prepared by a high-pressure, high-temperature method exhibits long-range ferrimagnetic order and anisotropic thermal expansion. The Cu2+ doping significantly changes the magnetic properties, affecting the ordering.
INORGANIC CHEMISTRY
(2022)
Article
Engineering, Electrical & Electronic
Xinyu Jiang, Zhengguang Zou, Bangrong He, Weijian Zhang, Zheng Mao
Summary: A series of La0.7Sr0.3-xSmxMn0.95Ni0.05O3 materials were synthesized by the Pechini sol-gel method to investigate the changes in structure and magnetic properties caused by the substitution of Sr2+ by Sm3+. The samples maintained a rhombohedral structure before and after the substitution, but the cell volume increased. The Curie temperature (T-C) and magnetic entropy change (Delta S-M) gradually decreased with increased doping, indicating weakened ferromagnetic coupling.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Physical
Faxue Lu, Yajun Ji, Dong Shi, Junnan Yao, Lijun Pei
Summary: In this study, a 3D Mn-doped NiCo hydroxide electrode material was prepared through metal doping and electrochemical reconstruction methods. The resulting material exhibited excellent capacitance performance and cycling stability, providing a feasible and effective strategy for high-performance supercapacitors.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
S. Imajo, T. Kobayashi, A. Kawamoto, K. Kindo, Y. Nakazawa
Summary: The thermodynamic properties of the organic superconductor lambda-(BETS)(2)GaCl4 were investigated to study the high-field superconducting state FFLO phase. An anomaly was observed at a field H-FFLO around 10 T, likely indicating a transition from a uniform superconducting state to the FFLO state. The results suggest that the high-field superconductivity in lambda-(BETS)(2)GaCl4 is likely the FFLO state from a thermodynamic perspective.
Article
Crystallography
Jie Wu, Shuai Zhang, Jun Yan, Bingsuo Zou, Ruosheng Zeng
Summary: In this study, the 0D metal halide (CsK2)BiCl6 was investigated theoretically and experimentally. It was found to have structural stability and improved luminescence properties through Mn doping.
Article
Chemistry, Physical
Yuping Ren, Hongbo Liu, Fangchao Liu, Gang Liu
Summary: Three incorporation manners of Mn, namely as an additive, substituting Fe site, and substituting Ti site, were investigated in Mn-doped 0.5BiFeO(3)-0.5SrTiO(3) ceramics. It was found that the incorporation manner significantly influenced the dielectric, ferroelectric, and magnetic properties, with Mn doping at Fe site enhancing magnetization.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Xiaodan Gou, Yiwen Zhang, Zejing Xing, Cheng Ma, Changjie Mao, Jun-Jie Zhu
Summary: In this study, a site-selective heat boosting electrochemiluminescence microscopy technique was reported. By generating a micron-scale heat point in situ at the electrode-solution interface, a 63-fold enhancement in luminescence intensity and a 0.2 V advance in applied voltage were achieved. Experimental results and finite element simulation showed that the fundamental reasons for this phenomenon were accelerated reaction rate and thermal convection via a photothermal effect. The concentrated electrochemiluminescence not only boosted the contrast of single cells by 20.54 times but also enabled the site-selective cell-by-cell analysis of the heterogeneous membrane protein abundance. This electrochemical visualization method has great potential in the highly sensitive and selective analysis of local electron transfer events.
Article
Materials Science, Multidisciplinary
Ying-Jie Zhang, Qing Li, Zhengyan Zhu, Yiwen Li, Wei Xie, Hai-Hu Wen
Summary: This study investigates the superconductivity and normal state properties of Ti1-xMnx alloys. It is found that with an increase in Mn doping, the crystal phase of the system changes and the superconducting property transforms from filamentary to bulk superconductivity. It is suggested that the superconductivity induced by dilute Mn doping is not intrinsic, but rather is influenced by the residual phase embedded in the alpha phase. Additionally, Ti0.88Mn0.12 exhibits a positive Hall coefficient and a significant reduction in charge-carrier density, which is contrary to pure Ti.
Article
Chemistry, Physical
Lijin Wang, Licun Fu, Yunhuan Nie
Summary: Research reveals that the relationship between the density of states and frequency of low-frequency excess vibrational modes in some three-dimensional glasses does not follow the quartic law found in previous simulation studies, which has implications for understanding the properties of glasses.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Energy & Fuels
Xin Wang, Junkai Chong, Shuoyang Liang, Min Guo, Mei Zhang
Summary: Sorbents of Mn doped CuO loading on alumina particles were successfully synthesized by hydrothermal method for capturing H2S at low-temperature in a dry and anaerobic environment. The effects of calcination temperature and Cu/Mn molar ratio on the desulfurization performance were investigated. The prepared sorbent showed improved breakthrough H2S capacity and CuO active component utilization.
Article
Physics, Applied
Anitha Anand, M. Manjuladevi, R. K. Veena, V. S. Veena, S. Sagar
Summary: The influence of non-magnetic Ti doping on the magnetoresistance and thermopower properties of Sm0.6Sr0.4MnO3 prepared by solid-state reaction method is investigated. The magnetoresistances of the samples increase with Ti doping at low temperatures. All samples have negative thermoelectric power at room temperature. The power factor is comparatively high for the 15% Ti-doped sample STMO0.15 at room temperature.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2022)
Article
Multidisciplinary Sciences
Lichen Wang, Guanhong He, Zichen Yang, Mirian Garcia-Fernandez, Abhishek Nag, Kejin Zhou, Matteo Minola, Matthieu Le Tacon, Bernhard Keimer, Yingying Peng, Yuan Li
Summary: By studying two members of the model Hg family, it is found that the energy of magnetic fluctuations may limit the highest critical temperature of cuprate superconductors, providing important clues for understanding the superconducting mechanism. Furthermore, the correlation between paramagnon energy and maximal critical temperature is also confirmed in other cuprate families.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Fei Li, Vladimir Pomjakushin, Bertrand Roessli, Romain Sibille, Marisa Medarde, Kazimierz Conder, Ekaterina Pomjakushina
Summary: In this study, magnetization and neutron powder diffraction were conducted on oxygen stoichiometric R1/3Sr2/3FeO3 (R = Pr and Nd) in the temperature range of 2 K to 300 K. Two magnetic models were proposed through a combination of irreducible representations and magnetic space groups, and both models fit the neutron powder diffraction data equally well.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
K. von Arx, Qisi Wang, S. Mustafi, D. G. Mazzone, M. Horio, D. John Mukkattukavil, E. Pomjakushina, S. Pyon, T. Takayama, H. Takagi, T. Kurosawa, N. Momono, M. Oda, N. B. Brookes, D. Betto, W. Zhang, T. C. Asmara, Y. Tseng, T. Schmitt, Y. Sassa, J. Chang
Summary: In high-temperature cuprate superconductors, the stripe order evolution across optimal doping remains controversial. This study investigates weak charge correlations in La2-xSrxCuO4 and La1.8-xEu0.2SrxCuO4 using resonant inelastic X-ray scattering. The results reveal temperature-dependent long-range stripe order only below optimal doping, while temperature-independent short-range correlations exist at higher doping, suggesting an unresolved electron-phonon coupling origin.
NPJ QUANTUM MATERIALS
(2023)
Article
Chemistry, Physical
Igor Plokhikh, Oscar Fabelo, Lilian Prodan, Michael Worle, Ekaterina Pomjakushina, Antonio Cervellino, Vladimir Tsurkan, Istvan Kezsmaerki, Oksana Zaharko
Summary: In this study, the properties of GdSb0.71Te1.22 are investigated through bulk magnetization measurements, single-crystal and powder synchrotron X-ray diffraction, as well as single-crystal hot-neutron diffraction. It is found that GdSb0.71Te1.22 exhibits a weak orthorhombic distortion and a charge density wave with incommensurate modulations. The magnetic structure is modulated with two propagation vectors, one of which persists up to the paramagnetic transition and the other disappears above an intermediate magnetic transition.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Multidisciplinary Sciences
Hiroki Ueda, Mirian Garcia-Fernandez, Stefano Agrestini, Carl P. Romao, Jeroen van den Brink, Nicola A. Spaldin, Ke-Jin Zhou, Urs Staub
Summary: The concept of chirality plays a crucial role in various natural phenomena. Recent studies in condensed matter physics have revealed the existence of chiral fermions and their connection to emergent phenomena and topology. However, experimental verification of chiral phonons in macroscopic systems remains challenging. In this study, we provide experimental evidence of chiral phonons using resonant inelastic X-ray scattering with circularly polarized X-rays. By studying the chiral material quartz, we demonstrate that circularly polarized X-rays couple to chiral phonons at specific positions in reciprocal space, allowing for the determination of the chiral dispersion of lattice modes. This experimental proof of chiral phonons introduces a new degree of freedom in condensed matter physics, with both fundamental importance and potential for exploring novel emergent phenomena based on chiral bosons.
Review
Physics, Multidisciplinary
Petr Adamus, Bing Xu, Premysl Marsik, Adam Dubroka, Paulina Barabasova, Hana Ruzickova, Pascal Puphal, Ekaterina Pomjakushina, Jeffery L. Tallon, Yves-Laurent Mathis, Dominik Munzar, Christian Bernhard
Summary: This study compares the phonon anomalies and electronic gap features in two weakly coupled two-leg-ladder systems (SCCO and YBCO) using experimental and theoretical methods. Results show that the a-axis conductivity in SCCO is similar to the c-axis conductivity in YBCO, and the c-axis conductivity in SCCO is strikingly similar to the in-plane conductivity in YBCO. These findings suggest that collective degrees of freedom play a significant role in the low-energy response of underdoped high-T (c) cuprates, and indicate the formation of quasi-one-dimensional structures similar to two-leg ladders in the CuO2 planes.
REPORTS ON PROGRESS IN PHYSICS
(2023)
Article
Multidisciplinary Sciences
Hebatalla Elnaggar, Abhishek Nag, Maurits W. Haverkort, Mirian Garcia-Fernandez, Andrew Walters, Ru-Pan Wang, Ke-Jin Zhou, Frank de Groot
Summary: In this study, the observation of triple-magnon excitation in alpha-Fe2O3 challenges the conventional wisdom that only 1- and 2-magnon excitations are possible in a resonant inelastic X-ray scattering experiment. The researchers demonstrate how a two-photon scattering process can generate exotic higher-rank magnons and discuss the relevance of these quasiparticles for magnon-based applications.
NATURE COMMUNICATIONS
(2023)
Correction
Multidisciplinary Sciences
Lichen Wang, Guanhong He, Zichen Yang, Mirian Garcia-Fernandez, Abhishek Nag, Kejin Zhou, Matteo Minola, Matthieu Le Tacon, Bernhard Keimer, Yingying Peng, Yuan Li
NATURE COMMUNICATIONS
(2023)
Article
Energy & Fuels
Robert A. House, Gregory J. Rees, Kit McColl, John-Joseph Marie, Mirian Garcia-Fernandez, Abhishek Nag, Ke-Jin Zhou, Simon Cassidy, Benjamin J. Morgan, M. Saiful Islam, Peter G. Bruce
Summary: Oxide ions in transition metal oxide cathodes can store charge at high voltage. However, during charging, the oxidized oxide ions form trapped O-2, resulting in undesirable voltage hysteresis. By studying ribbon-ordered Na-0.6[Li0.2Mn0.8]O-2, the authors discovered the delocalized electron holes on oxide ions before O-2 formation. The understanding of these hole states is crucial for realizing reversible high-voltage O-redox cathodes.
Article
Chemistry, Multidisciplinary
Jaewon Choi, Jiemin Li, Abhishek Nag, Jonathan Pelliciari, Hannah Robarts, Charles C. Tam, Andrew Walters, Stefano Agrestini, Mirian Garcia-Fernandez, Dongjoon Song, Hiroshi Eisaki, Steve Johnston, Riccardo Comin, Hong Ding, Ke-Jin Zhou
Summary: This study reveals the spatial symmetry of charge density waves (CDWs) in copper-oxide superconductors using high-resolution resonant inelastic x-ray scattering. The experimental results show anisotropic CDW peaks with elliptical shapes in Bi2Sr2-xLaxCuO6+δ, interpreted as evidence of unidirectional charge stripes. This work provides new insights into the symmetry and microscopic description of CDWs in copper-oxide superconductors.
ADVANCED MATERIALS
(2023)
Proceedings Paper
Physics, Applied
Yuqing Ge, Daniel Andreica, Yasmine Sassa, Elisabetta Nocerino, Ekaterina Pomjakushina, Rustem Khasanov, Henrik M. Ronnow, Martin Mansson, Ola Kenji Forslund
Summary: A Muon Spin Rotation (mu+SR) study was conducted to investigate the magnetic properties of SrCu2(BO3)(2) (SCBO) as a function of temperature/pressure. Measurements in zero field and transverse field confirm that there is no long range magnetic order at high pressures and low temperatures. The observed changes in the Cu spin fluctuations, above 21 kbar, suggest the formation of a plaquette phase, consistent with previous inelastic neutron scattering measurements. SCBO, being the only known realization of the Shatry-Sutherland model, likely has a plaquette state as its ground state mediating the dimer and antiferromagnetic phase.
15TH INTERNATIONAL CONFERENCE ON MUON SPIN ROTATION, RELAXATION AND RESONANCE
(2023)
Article
Materials Science, Multidisciplinary
V Pomjakushin, I. Plokhikh, J. S. White, Y. Fujishiro, N. Kanazawa, Y. Tokura, E. Pomjakushina
Summary: From new neutron powder diffraction experiments on MnGe, we determined all possible magnetic superstructures that fit the crystal symmetry. The magnetic structures exhibit incommensurate propagation vectors aligned with cubic axes. Multiple topologically nontrivial magnetic structures are found, including hedgehog and skyrmion structures, which may contribute to the topological Hall effect. The orthorhombic distortions caused by the transition to the magnetically ordered state leave both orthorhombic hedgehog and skyrmion models as equal candidates for the magnetic structures.
Article
Nanoscience & Nanotechnology
Chiara Ricca, Elizabeth Skoropata, Marta D. Rossell, Rolf Erni, Urs Staub, Ulrich Aschauer
Summary: A highly ordered Moire dislocation lattice has been discovered recently, and the structure and defect chemistry of these dislocations have been investigated through experimental characterization and computational calculations. The results show the presence of undercoordinated light metal cations and oxygen vacancies at the dislocation cores, which may affect the properties of complex multifunctional heterostructures and result in the reduction of Ti ions through electron doping.
ACS APPLIED MATERIALS & INTERFACES
(2023)
