Article
Chemistry, Physical
Sabeur Mansouri, Mohamed Balli, Serge Jandl, Aminat Oyiza Suleiman, Patrick Fournier, Sayed Hamad Bukhari, Joelle Margot, Mohamed Chaker
Summary: The spin-phonon coupling and magnetocaloric effect in polycrystalline GdMn2O5 were studied using Raman spectroscopy and isothermal magnetization curves. It was observed that the frequencies of 680 and 700 cm-1 modes showed anomalous temperature variations, indicating a strong spin-phonon coupling below the Neel temperature. The frequency deviation from standard temperature dependence was quantitatively explained by a simplified theoretical model. Additionally, a relatively large magnetic entropy change of Smax = 9.8 J/(kg K) was achieved with magnetic fields up to 70 kOe. The polycrystalline samples of GdMn2O5, with their low-cost fabrication and large electric polarisation, were found to be more suitable for possible cooperative magneto-electrocaloric refrigeration.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Physics, Condensed Matter
A. N. Matveeva, I. A. Zobkalo, A. Sazonov, A. L. Freidman, S. V. Semenov, M. I. Kolkov, K. Yu Terentjev, N. S. Pavlovskiy, K. A. Shaykhutdinov, V. Hutanu
Summary: The effect of substituting Dy by Ho on the magneto-electric behavior of Dy0.8Ho0.2MnO3 was studied using polarized and classical neutron diffraction, as well as macroscopic methods. It was found that substituting 20% of Dy with Ho did not change the overall crystal symmetry of the compound, which remained of Pbnm type at very low temperatures. The magnetic ordering, temperature, and field evolution were determined using single crystal neutron diffraction and magnetization measurements. The presence of a chiral magnetic structure on the Mn subsystem was confirmed below Tc & AP;16 K. Polarized neutron diffraction revealed that the rare earth magnetic ordering in Dy0.8Ho0.2MnO3 had a 3-component character, in contrast to DyMnO3. It was shown that doping with 20% Ho suppressed the spontaneous rare-earth ordering and allowed for coherent incommensurate spatial propagation between the manganese and rare earth subsystems. The study also demonstrated the strong magneto-electric coupling in the multiferroic phase, as evidenced by the direct influence of an external electric field on the magnetic chirality. The correlation between microscopic and macroscopic investigations was established by studying electric polarization under similar temperatures and fields on the same samples.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Chemistry, Multidisciplinary
Young-Woo Son, Hosub Jin, Sejoong Kim
Summary: This study examines the electronic properties of a new planar carbon crystal formed by networking biphenylene molecules, revealing novel electronic features such as zone-center saddle points and peculiar type-II Dirac fermionic states among carbon materials. Additionally, possible magnetic instabilities related to low-energy bands are discussed, and the effects of moderate uniaxial strain on the merging of Dirac points with zone-center saddle points are explored.
Article
Multidisciplinary Sciences
Alexey Falin, Haifeng Lv, Eli Janzen, James H. Edgar, Rui Zhang, Dong Qian, Hwo-Shuenn Sheu, Qiran Cai, Wei Gan, Xiaojun Wu, Elton J. G. Santos, Lu Hua Li
Summary: This study uses single-atom-thin hBN to investigate the mechanical properties of materials and finds that the lighter isotope 10B exhibits higher elasticity and strength compared to the heavier isotope 11B. This suggests that two-dimensional materials can be used to study the intrinsic mechanical properties of materials, and the normally neglected isotopic perturbation sometimes plays a more critical role than the isotopic mass effect in the mechanical and other physical properties. Two-dimensional materials can serve as good platforms for studying extremely subtle mechanical behaviors.
NATURE COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Hong Ao, Wenchuan Li, Yulin Zhang, Siqi Zhong, Heng Wu, Rongli Gao, Xiaoling Deng, Gang Chen, Chunlin Fu, Zhenhua Wang, Wei Cai, Xiang Lei
Summary: In this study, multiferroic materials were prepared using hydrothermal method and sol-gel method, and the effect of PZT particle size on magnetoelectric properties was investigated. The results showed that the PZT particle size has a significant influence on the dielectric constant, polarization intensity, and magnetoelectric coupling coefficient. This research is of great significance for the potential application of multiferroic materials.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Multidisciplinary Sciences
Masaki Uchida, Shin Sato, Hiroaki Ishizuka, Ryosuke Kurihara, Taro Nakajima, Yusuke Nakazawa, Mizuki Ohno, Markus Kriener, Atsushi Miyake, Kazuki Ohishi, Toshiaki Morikawa, Mohammad Saeed Bahramy, Taka-hisa Arima, Masashi Tokunaga, Naoto Nagaosa, Masashi Kawasaki
Summary: The study of the magnetic semiconductor EuAs revealed a new mechanism for inducing large anomalous Hall effect (AHE) in magnetic semiconductors through spin cluster scattering. This suggests potential for developing a field targeting diluted carriers strongly coupled to noncoplanar spin structures.
Article
Materials Science, Multidisciplinary
Lingfei Wang, Wenwen Xu, Xuefeng Zhou, Chao Gu, Hu Cheng, Jian Chen, Liusuo Wu, Jinlong Zhu, Yusheng Zhao, Er-Jia Guo, Shanmin Wang
Summary: We systematically investigated the finite-size effect on the magnetostructural transition in CrN by studying a series of nanoparticle samples prepared through a high-pressure method. We discovered anomalous critical behaviors near the transition, especially for spin correlation length, which can be attributed to the strong spin-lattice coupling in this nitride. Using the Gibbs-Thomson theorem and considering the size-dependent effect, we derived a scaling relationship between the transition temperature and spin correlation length, taking into account the transition-induced volume change. A phenomenological model was also established to understand the kinetics and dynamics of magnetic fluctuation at transition in a finite-size system. Additionally, we found that CrN nanoparticles have a compressed surface shell described by Laplace pressure, following a unique 1/d(1.8) finite-size scaling law.
Article
Materials Science, Multidisciplinary
Andrei Zadorozhnyi, Yuri Dahnovsky
Summary: The spin-spiral texture in helimagnets can significantly alter charge transport properties, specifically the anomalous Hall effect. The behavior of direct conductivity shows kinks, while the anomalous Hall current exhibits changing sign, with minima and maxima depending on the chemical potential μ. The origin of the anomalous Hall effect is attributed to the interplay between the asymmetry of energy bands in the x and z directions and spin restrictions due to the conical potential.
Article
Chemistry, Inorganic & Nuclear
Robert D. Smyth, Dmitry Khalyavin, Yoshihiro Tsujimoto, Kazunari Yamaura, Simon J. Clarke
Summary: The full characterisation of the high-pressure-synthesised, metastable layered oxyhalide Sr2NiO2Cl2 is reported, unveiling its unique crystal structure and magnetic properties.
SOLID STATE SCIENCES
(2023)
Article
Nanoscience & Nanotechnology
Cai Jin, Xiaowen Li, Wenqiao Han, Qi Liu, Sixia Hu, Yanjiang Ji, Zedong Xu, Songbai Hu, Mao Ye, Meng Gu, Yuanmin Zhu, Lang Chen
Summary: Integrating materials characteristics through constructing artificial superlattices has led to the successful synthesis of BiFeO3/BiMnO3 SLs with considerable ferroelectric polarizations and tunable magnetic moments. The tunable magnetic moments of SLs are closely linked to the dimensionality of BiFeO3 layers, with the superexchange interaction of Fe-O-Mn in SLs tending towards antiferromagnetic rather than ferromagnetic as the dimensionality of BiFeO3 per period is reduced. This interlayer modulation effect in SLs offers an attractive way to precisely control multiple order parameters in a multiferroic oxide system.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
S. X. Yang, X. Q. Zheng, L. Xi, D. S. Wang, C. F. Liu, J. W. Xu, L. C. Wang, Z. Y. Xu, J. Y. Zhang, Y. F. Wu, J. X. Shen, H. Huang, S. G. Wang, B. G. Shen
Summary: The study systematically investigated the effect of In or Ge substitution for Ga on magnetic ordering in TmGa(In/Ge) compounds. It was found that Ge substitution has a significant influence on magnetic ordering, while In substitution leads to similar magnetic transitions. Additionally, variable temperature XRD experiments revealed a sharp change in bond length between nearest neighboring Tm atoms with increasing temperature.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Akhil K. Ramesh, Yi-Ting Chou, Mu-Ting Lu, Pushparaj Singh, Yuan-Chieh Tseng
Summary: This paper presents an approach to biological sensing using spintronic devices to detect magnetic particles attached to biological carriers. The proposed sensor offers real-time measurement results and is compatible with semiconductor fabrication technology, allowing for integration with semiconductor chips and reducing manufacturing cost and power consumption.
Article
Chemistry, Multidisciplinary
H. Wu, H. Ao, W. Li, Z. Zeng, R. Gao, C. Fu, G. Chen, X. Deng, Z. Wang, X. Lei, W. Cai
Summary: BST and CCFO nanopowders were prepared by different methods and used to create BST-CCFO multiferroic fluids with various mass ratios. Interestingly, the multiferroic fluid formed a chain structure under the external magnetic field, enhancing the magnetoelectric performance significantly.
MATERIALS TODAY CHEMISTRY
(2021)
Article
Physics, Applied
Yuki Hamada, Yuichiro Kurokawa, Tomoki Yamauchi, Hiroki Hanamoto, Hiromi Yuasa
Summary: Experimental investigation showed that the Fe3Si film exhibits a large anomalous Nernst effect (ANE) compared to other iron-silicide films. The highest ANE coefficient was observed for Fe3Si, suggesting that the contribution of αyx dominates in the enhancement of ANE in Fe3Si.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Guillermo Lopez-Polin, Hugo Aramberri, Jorge Marques-Marchan, Benjamin Weintrub, Kirill Bolotin, Jorge Cerda, Agustina Asenjo
Summary: Research has focused on increasing the ANE coefficient of materials, but little effort has been devoted to increasing the power supplied by the effect. By fabricating micrometer-sized devices and using materials with high ANE thermopower, record power densities generated by the ANE have been achieved.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
H. Y. Huang, A. Singh, C. Wu, J. D. Xie, J. Okamoto, A. A. Belik, E. Kurmaev, A. Fujimori, C. T. Chen, S. Streltsov, D. J. Huang
Summary: The state with effective total moment J(eff) = 1/2 can suppress Jahn-Teller distortions and induce a strong exchange anisotropy, leading to the formation of a spin-liquid state in real materials. However, diagnosing this state remains challenging. In this study, resonant inelastic X-ray scattering is used to probe the J(eff) = 1/2 state in CuAl2O4, and it is found that a Jahn-Teller state competes with the J(eff) = 1/2 state in this compound.
NPJ QUANTUM MATERIALS
(2022)
Article
Chemistry, Inorganic & Nuclear
Alexei A. Belik
Summary: Aurivillius phases are important inorganic compounds with potential ferroelectric properties. Bi4Ti3O12 is a well-known compound in this family, and a full magnetic analogue, Bi4V3O12, has been successfully synthesized with d(1) cations. Bi4V3O12 shows reversible structural transitions in an inert atmosphere, and exhibits anisotropic thermal expansion as well as low-dimensional magnetism with antiferromagnetic interactions.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Physical
Yu Yu Dikhtyar, D. A. Spassky, V. A. Morozov, D. Deyneko, A. A. Belik, O. Baryshnikova, I. Nikiforov, B. Lazoryak
Summary: Ca(8)ZnLn(PO4)(7) phosphates with β-Ca-3(PO4)(2)-type structure were prepared by high-temperature solid-state technique, and the influence of Ln(3+) on its structure, luminescent properties and temperature of phase transitions was investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
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
Chemistry, Physical
Alexei A. Belik, Andreas Doenni, Masahiko Tanaka, Iana S. Glazkova, Alexey V. Sobolev, Igor A. Presniakov
Summary: New ferrites with the BaRFeO4 composition (R = Ho, Er, Tm, and Yb) were synthesized using a solid-state method. Their crystal structures, physical properties, and magnetic behavior were studied. The results showed distinct magnetic transitions for different R values and evidence of spin-induced ferroelectric polarization, suggesting complex magnetic structures and exchange interactions.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Dmitry Karpinsky, Maxim Silibin, Siarhei Latushka, Dmitry Zhaludkevich, Vadim V. Sikolenko, Roman Svetogorov, M. Sayyed, Nouf Almousa, Alex Trukhanov, Sergei Trukhanov, Alexei A. Belik
Summary: The compound BiFe0.7Mn0.3O3 consists of coexistent anti-polar orthorhombic and polar rhombohedral phases at room temperature. It has a metastable structural state which can be modified by thermal annealing and an external magnetic field. These modifications lead to changes in the volume fraction of the rhombohedral phase and the magnetic properties of the compound.
Article
Chemistry, Multidisciplinary
Svetlana M. M. Posokhova, Vladimir A. A. Morozov, Dina V. V. Deyneko, Boris S. S. Redkin, Dmitry A. A. Spassky, Vitali Nagirnyi, Alexei A. A. Belik, Joke Hadermann, Erzhena T. T. Pavlova, Bogdan I. I. Lazoryak
Summary: The influence of preparation techniques on the structure and luminescent properties of K5Eu(MoO4)(4) (KEMO) was studied. The different synthesis techniques resulted in variations in the crystal structure of KEMO, with the CZ technique producing a (3 + 1)D incommensurately modulated structure. The crystal grown by the CZ technique also exhibited the highest luminescent intensity and a high quantum yield of 66.5%.
Article
Chemistry, Inorganic & Nuclear
Xun Kang, Alexei A. Belik, Yoshihiro Tsujimoto, Kazunari Yamaura
Summary: Under high-pressure and high-temperature conditions, doped Bi3Re3O11 and Bi3Re3O11 with Fe up to 29 atomic % were synthesized. The crystal structures and chemical compositions of Bi3Os2.45Fe0.55O11 and Bi3Re2.13Fe0.87O11 were determined by synchrotron powder X-ray diffraction and electron probe microanalysis. Both materials showed magnetic and electronic transport properties, indicating their potential for spintronic devices.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Physical
Alexei A. Belik, Ran Liu, Kazunari Yamaura
Summary: Sm2MnZnMn4-xTixO12 perovskites with different Mn contents were synthesized, and it was found that Zn doping significantly modified the magnetic properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Alexei A. Belik, Ran Liu, Kazunari Yamaura
Summary: In this study, a new perovskite-type oxide with a rare columnar A-site order was successfully prepared using a high-pressure, high-temperature method. The crystal structure and properties of the compound were investigated, revealing spin-glass magnetic properties and frequency and temperature independent dielectric constant.
Article
Chemistry, Physical
Dmitry Spassky, Andrey Vasil'ev, Nataliya Krutyak, Oleg Buzanov, Vladimir Morozov, Alexei Belik, Nikita Fedorov, Patrick Martin, Andrei Belsky
Summary: The decay kinetics of Gd3Al2Ga3O12:Ce3+ single crystal luminescence were investigated under dense laser excitation. Both the decay times and the intensity of Ce3+ luminescence were found to be dependent on the excitation density. These observed effects were attributed to the interaction between excitons and the energy transfer from excitons to Ce3+. Numerical simulation of the experimental results was carried out to support the proposed model.
Article
Chemistry, Physical
Alexei A. Belik, Ran Liu, Andreas Donni, Masahiko Tanaka, Kazunari Yamaura
Summary: In this work, perovskite solid solutions (Lu0.5Mn0.5)(Mn1-xTix)O-3 were synthesized and their crystal structure was determined by Rietveld analysis of X-ray powder diffraction data. It was found that the x=0.25 and 0.50 samples exhibit long-range ferrimagnetic order below their respective transition temperatures Tc=89K and 36K, despite the presence of non-magnetic Ti4+ ions diluting the A and B sublattices. The x=0.75 sample shows a spin-glass transition at Ts=6K. Temperature-independent dielectric constants were observed for the x=0.50 and x=0.75 samples.
Article
Chemistry, Physical
Elena V. V. Sipina, Dmitry A. A. Spassky, Nataliya R. R. Krutyak, Vladimir A. A. Morozov, Evgenia S. S. Zhukovskaya, Alexei A. A. Belik, Mikhail S. S. Manylov, Bogdan I. I. Lazoryak, Dina V. V. Deyneko
Summary: beta-Ca-3(PO4)(2)-type phosphors Ca9-xMnxEu(PO4)(7) were synthesized and characterized. The abnormal reduction of Eu3+ to Eu2+ in air was observed and confirmed by PL spectra study and XPS. The redistribution of Eu2+/Eu3+ ions among crystal sites and the abnormal quenching of Eu3+ emission were discussed in detail.
Article
Materials Science, Multidisciplinary
Bin Gao, Tong Chen, Han Yan, Chunruo Duan, Chien-Lung Huang, Xu Ping Yao, Feng Ye, Christian Balz, J. Ross Stewart, Kenji Nakajima, Seiko Ohira-Kawamura, Guangyong Xu, Xianghan Xu, Sang-Wook Cheong, Emilia Morosan, Andriy H. Nevidomskyy, Gang Chen, Pengcheng Dai
Summary: This research demonstrates that applying a large external magnetic field to Ce2Zr2O7 induces an Anderson-Higgs transition, condensing the spinons into a static ferromagnetic state with octupolar spin waves that are not visible to neutrons but contribute to the heat capacity. The study also provides a qualitative understanding for the presence of octupole scattering at large wave vectors in Ce2Sn2O7 and its absence in Ce2Zr2O7. These findings identify Ce2Zr2O7 as a strong candidate for an octupolar U(1) QSL and establish frustrated magnetic octupolar interactions as responsible for QSL properties in Ce-based pyrochlore magnets.
Article
Materials Science, Multidisciplinary
Biswajit Dalal, Xun Kang, Yoshitaka Matsushita, Alexei A. Belik, Yoshihiro Tsujimoto, Kazunari Yamaura
Summary: This study focuses on the comparative analysis of Gd0.5Sr0.5CrO3 and Gd0.5Ca0.5CrO3, two half-doped perovskite-type chromites, and reveals that the Cr4+ oxidation state can be stabilized under high-pressure conditions. The materials were characterized using various techniques, including synchrotron x-ray diffraction and magnetization measurements, and were found to exhibit different crystal structures and magnetic properties.
