Article
Materials Science, Multidisciplinary
Chongli Yang, Jing Guo, Shu Cai, Yazhou Zhou, Vladimir A. Sidorov, Cheng Huang, Sijin Long, Youguo Shi, Qiuyun Chen, Shiyong Tan, Qi Wu, Piers Coleman, Tao Xiang, Liling Sun
Summary: The recent discovery of superconductivity in the heavy fermion compound UTe2 has sparked interest. The stoichiometric UTe2 was found to be nonsuperconducting, but can be compressed into a superconducting state under quasi-uniaxial pressure. This pressure-induced superconductivity coexists with an exotic magnetic state.
Article
Materials Science, Multidisciplinary
Quynh Anh T. Nguyen, Thi H. Ho, Myung-Hwa Jung, Sonny H. Rhim
Summary: The effect of Co substitution on Mn3Ga was examined using first-principles study, revealing that Mn3Ga prefers tetragonal phase when Co concentration (x) is less than or equal to 0.5, and cubic phase when x is greater than or equal to 0.5. The ferrimagnetic property remains robust regardless of x in both phases.
CURRENT APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Amrita Datta, Mantu Modak, Pralay Paul, Manju Mishra Patidar, T. V. Chandrasekhar Rao, V. Ganesan, Sangam Banerjee
Summary: The study reveals that the compound Cr2CoAl exhibits soft magnetic properties with low magnetic moment below 20.5K, and may contain magnetic clusters. Additionally, the compound shows a paramagnetic to short-range ordered ferromagnetic transition around 20.5K, increasing resistivity with temperature, and T-2 dependency in resistivity at low temperatures.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Multidisciplinary Sciences
Kentaro Ueda, Tonghua Yu, Motoaki Hirayama, Ryo Kurokawa, Taro Nakajima, Hiraku Saito, Markus Kriener, Manabu Hoshino, Daisuke Hashizume, Taka-hisa Arima, Ryotaro Arita, Yoshinori Tokura
Summary: This study investigates the less studied half-Heusler alloy HoAuSn and demonstrates its transition into a Weyl semimetal state under a magnetic field, resulting in a significant decrease in resistance.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Md Rejaul Karim, Arundhati Adhikari, Surya Narayan Panda, Purbasha Sharangi, Soubhik Kayal, Gouranga Manna, P. S. Anil Kumar, Subhankar Bedanta, Anjan Barman, Indranil Sarkar
Summary: This study demonstrates the electrochemical growth of Heusler alloy film on a single-crystalline substrate with good morphological quality and crystalline order. The surface magnetization reversal of the films is revealed using static magneto optical Kerr effect studies. The understanding of magnetization dynamics in these materials is presented using time-resolved magneto optical Kerr effect measurements under femtosecond laser excitation, with further insights gained from excitation laser fluence dependence study on ultrafast demagnetization time, fast remagnetization time, and magnetic damping parameter correlations.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Physics, Applied
Zheng Su, Xiao-Bin Guo, Wen-Hai Qiu, Ang He, Wen-Hua Li, Yan-Ping Jiang, Shui-Feng Li, Xin-Gui Tang
Summary: In this study, we achieved pure electric field-controlled 180 degrees magnetization switching by engineering a specific shape of nanomagnet on a piezoelectric substrate. The results help to understand electrically regulated magnetization reversal and provide new insights for designing multistate spintronic devices.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Yang Liu, Xiuting Xu, Wei Fang, Sukai Teng, Xinjian Xie, Linyang Li, Shanshan Fan, Jun Li, Jia Li
Summary: The TiFe0.5Ni0.5Sb compound with special quasi-random structure (SQS) was modeled using the 18-electron rule, showing a nonmagnetic indirect band gap semiconductor with a band gap of 0.45 eV. Its lattice thermal conductivity decreases with increasing temperature, while the dimensionless figure of merit ZT at 1390 K is evaluated to be 0.35, higher than its parent compound. The theoretical prediction for TiFe0.5Ni0.5Sb can simulate experimental results and potentially improve the TE performance of disordered alloys using the 18-electron rule.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Yitian Ma, Yayi Yang, Yuan Gao, Yong Hu
Summary: In NiMn-based Heusler alloys, SEB with ferromagnetic and antiferromagnetic exchange interactions is influenced by parameters such as K-AF, J(FM-AF), J(AF-AF), and x(FM), with the maximum SEB value obtained at specific parameter values. The magnetic relaxation properties of the materials also play a role in determining the final SEB.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Yurong Ruan, Ke Zhong, Ying Zhang, Fang Zhang, Yubo Zhang, Wenqing Zhang
Summary: A large group of intrinsic off-stoichiometry quaternary Heusler-like semiconductors with mixing and tunable occupation of atomic sites has been discovered. These novel semiconductors break the conventional electron counting rule and have a compensated electronic structure due to the introduction of extra atoms.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Guijiang Li, Qihang Sun, Lei Xu, Guodong Liu, Zhenhua Cao
Summary: The phase stability of Ti2MnAl Heusler compound was investigated using first-principles calculations. The formation mechanisms of non-magnetic Ti2MnAl in Cu2MnAl-type structure and spin gapless semiconductor in Ti2MnAl with Hg2CuTi-type structure were revealed. It was found that the kinetic arrest of atomic diffusion during sample preparation resulted in the metastable spin gapless semiconductor in Ti2MnAl film sample. The study suggests that interatomic orbital hybridization is crucial for the atomic configuration and phase stability in Ti2MnAl, and it can be controlled by careful control of the kinetic diffusion process.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Physics, Condensed Matter
Biplab Bag, Rajendra Loke, Birender Singh, A. Thamizhavel, Bahadur Singh, S. Ramakrishnan
Summary: In this study, we investigated the superconducting state properties and electronic structure of ScAu2Al, a full Heusler material. Our results show that ScAu2Al exhibits the highest superconducting transition temperature among the Heusler superconductors and belongs to the moderate type-II superconductors. The electron-phonon coupling constant in ScAu2Al is found to be the highest among the reported Heusler superconductors, indicating the significant role of electron-phonon coupling in mediating superconductivity.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Chemistry, Physical
Jing-Han Chen, Tej Poudel Chhetri, Anthony T. Grant, Chung-Kai Chang, David P. Young, Igor Dubenko, Naushad Ali, Shane Stadler
Summary: The magnetic, structural, and thermal behaviors of Cu-doped Heusler alloy Ni2Mn1-xCuxGa (0 <= x <= 0.4) were investigated as a function of Cu concentration. Increasing Cu concentration led to higher structural transition temperatures, while chemical order-disorder transition temperatures and melting points decreased. The study constructed a comprehensive phase diagram of magnetic and structural properties as a function of Cu concentration.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
S. Parajuli, C. Cheng, J. W. Wei, K. G. Martuza, M. Irfan, X. M. Zhang, K. Javed, J. F. Feng, X. F. Han
Summary: One-dimensional nanogeometries of Ni2FeGa have been fabricated in AAO templates using electrodeposition technique, showing ferromagnetic behavior from low temperatures to room temperature. The difference in magnetic properties between nanowires and nanotubes is mainly attributed to the anisotropy field.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Chemistry, Physical
Noah Hoffmann, Tiago F. T. Cerqueira, Pedro Borlido, Antonio Sanna, Jonathan Schmidt, Miguel A. L. Marques
Summary: We conducted an extensive study on the superconducting and elastic properties of the cubic (full-)Heusler family using a combination of ab initio methods and interpretable and predictive machine-learning models. Through statistical analysis and comparison with anti-perovskites, we identified universal behaviors common to all conventional superconductors as well as specific behaviors unique to the Heusler family. Our findings include the discovery of eight hypothetical materials with critical temperatures above 10 K, surpassing the current record of Tc = 4.7 K in this family. These materials are also expected to be highly ductile, making them potential candidates for superconducting magnets' wire and tape manufacturing.
NPJ COMPUTATIONAL MATERIALS
(2023)
Article
Physics, Multidisciplinary
Yooleemi Shin, Mircea Vomir, Dong-Hyun Kim, Phuoc Cao Van, Jong-Ryul Jeong, Ji-Wan Kim
Summary: This study demonstrates the significant role of quasi-static strain (QSS) in the ultrafast spin dynamics of ferromagnetic materials using ultrafast Sagnac interferometry and magneto-optical Kerr effect.
COMMUNICATIONS PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Su Kong Chong, Peng Zhang, Jie Li, Yinong Zhou, Jingyuan Wang, Huairuo Zhang, Albert. V. V. Davydov, Christopher Eckberg, Peng Deng, Lixuan Tai, Jing Xia, Ruqian Wu, Kang. L. L. Wang
Summary: A novel procedure combining thin-film deposition and 2D material stacking techniques is demonstrated to create dual-gated devices of magnetically doped topological insulators. The orthogonal control over the charge density and electric displacement field is achieved in these devices. Through electrical manipulation of the surface exchange gap, the capabilities to strengthen or suppress the quantum anomalous Hall state and drive a topological phase transition to a trivial state are demonstrated. The experimental results are explained using first principle theoretical calculations, providing a practical route for in situ control of quantum anomalous Hall states and topology.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Yipeng An, Juncai Chen, Zhengxuan Wang, Jie Li, Shijing Gong, Chunlan Ma, Tianxing Wang, Zhaoyong Jiao, Ruqian Wu, Jiangping Hu, Wuming Liu
Summary: In this study, a new kagome magnesium triboride (MgB3) superconductor is predicted, with a calculated critical temperature of about 12.2 K and 15.4 K under external stress, which is potentially the highest among the reported diverse kagome-type superconductors. Various exotic physical properties of the system, including van Hove singularity, flat-band, multiple Dirac points, and nontrivial topology, are revealed. The topological and nodal superconducting nature of MgB3 is unveiled using a recently developed symmetry indicators method. This study suggests that MgB3 can serve as a new platform to explore exotic physics in the kagome structure and search for more superconductors and topological materials with XY3-type kagome lattice.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Shabbir Tahir, Joachim Landers, Soma Salamon, David Koch, Carlos Donate-Buendia, Anna R. Ziefuss, Heiko Wende, Bilal Goekce
Summary: A method has been developed to generate magnetocaloric microstructures from an equiatomic iron-rhodium (FeRh) bulk target. Paramagnetic near-to-equiatomic solid-solution FeRh nanoparticles are generated through picosecond-pulsed laser ablation in ethanol, and then transformed into printable ink and patterned using a continuous wave laser. FeRh 2D structures with different geometries can be created using laser sintering of magnetocaloric inks.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Physical
Amir H. Omranpoor, Anupam Bera, Denise Bullert, Matthias Linke, Soma Salamon, Samira Weber, Heiko Wende, Eckart Hasselbrink, Eckhard Spohr, Stephane Kenmoe
Summary: The interaction between 2-propanol and Co3O4(001) was investigated to understand the molecular pathways of catalytic oxidation. Experimental and theoretical studies confirmed that 2-propanol adsorbs molecularly. The presence of water not only competes for adsorption on the surface, but also inhibits the deprotonation of 2-propanol. The presence of water deactivates the lattice oxygen, reducing surface activity.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Jie Li, Ruqian Wu
Summary: In this study, a van der Waals (vdW) heterostructure of ultrathin MnBi2Se4 and Bi2Se3 layers is proposed as an excellent tunable platform for the quantum anomalous Hall (QAH) effect. The band gap of this heterostructure closes and reopens as the applied electric field increases, exhibiting a novel topological phase transition. It also has other advantageous properties such as a large topological band gap, perpendicular magnetization, and strong ferromagnetic ordering.
Article
Chemistry, Multidisciplinary
Huaixun Huyan, Zhe Wang, Linze Li, Xingxu Yan, Yi Zhang, Colin Heikes, Darrell G. Schlom, Ruqian Wu, Xiaoqing Pan
Summary: Defect engineering in perovskite thin films has received extensive attention due to their atomic-level modification and the design of novel nanostructures. However, three-dimensional defect-assisted nanostructures in thin film matrices usually have large misfit strains and unstable structures. In contrast, one- or two-dimensional defect-assisted nanostructures embedded in thin films can sustain large misfit strains without relaxation, making them suitable for defect engineering in perovskite thin films.
Article
Chemistry, Inorganic & Nuclear
Georgia Gkouzia, Damian Guenzing, Ruiwen Xie, Teresa Wessels, Andraas Kovacs, Alpha T. N'Diaye, Maïrton Major, J. P. Palakkal, Rafal E. Dunin-Borkowski, Heiko Wende, Hongbin Zhang, Katharina Ollefs, Lambert Alff
Summary: This study investigates the effect of copper substitution on the magnetic properties of SmCo5 thin films synthesized by molecular beam epitaxy. The results show that copper substitution not only stabilizes the formation of the SmCo5 structure but also enhances magnetic anisotropy and coercivity. X-ray magnetic circular dichroism and scanning transmission electron microscopy reveal the nanoscale inhomogeneities in the distribution of copper and cobalt.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Benedikt Eggert, Asli Cakir, Damian Guenzing, Nicolas Josten, Franziska Scheibel, Richard A. Brand, Michael Farle, Mehmet Acet, Heiko Wende, Katharina Ollefs
Summary: The precipitation process of L2(1)-ordered Ni2MnSn and L1(0)-ordered NiMn in off-stoichiometric Ni50Mn45Sn5 during temper annealing is investigated using X-ray diffraction and Sn-119 Mossbauer spectroscopy. The induced magnetic Sn moment is shown to be a powerful tool for detecting microscopic structural changes and investigating the formation of nano-precipitates. Similar research can be conducted in the future on different pinning type magnets like Sm-Co or Nd-Fe-B.
Article
Chemistry, Multidisciplinary
Jan Grunwald, Jorge Torres, Axel Buchholz, Christian Naether, Lea Kaemmerer, Manuel Gruber, Sebastian Rohlf, Sangeeta Thakur, Heiko Wende, Winfried Plass, Wolfgang Kuch, Felix Tuczek
Summary: The article reports a compound with unprecedented properties, which can maintain its high-spin state at high temperatures for a long period of time under light irradiation. The researchers attribute this behavior to the large structural difference between the two spin states and the four distortion coordinates associated with the spin transition, which drastically reduce the relaxation rate of the metastable high-spin state. These findings open up new strategies for developing compounds that exhibit light-induced excited spin state trapping (LIESST) at high temperatures, potentially around room temperature.
Article
Materials Science, Multidisciplinary
S. B. Song, Z. Wang, R. Q. Wu
Summary: In this study, we used density functional theory calculations to investigate the magnetic properties of 5d transition metal monolayers on a ferroelectric substrate. Our results showed that the easy magnetization axis of iridium and platinum monolayers can be rotated by 90 degrees by reversing the electric polarization of the substrate, while the magnetocrystalline anisotropy energy of the osmium monolayer is significantly enhanced in the upward polarization state. These findings provide valuable insights for controlling the magnetization direction of monoatomic layers and developing low-energy spintronics devices.
Article
Chemistry, Physical
Steven Angel, Michael Braun, Baris Alkan, Joachim Landers, Soma Salamon, Heiko Wende, Corina Andronescu, Christof Schulz, Hartmut Wiggers
Summary: The product properties of mixed oxide nanoparticles synthesized via spray-flame synthesis depend on the solvent and precursor chemistries in the solution. The use of different metal precursors, acetates and nitrates, in a solvent mixture of ethanol and 2-ethylhexanoic acid was studied for the synthesis of LaFexCo1-xO3 perovskites. Regardless of the precursors used, similar particle-size distributions were obtained. The choice of precursors affected the elemental distributions and the formation of secondary phases.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Chemistry, Physical
Ao Lou, Hua-Hua Fu, Ruqian Wu
Summary: Using density functional theory and the Boltzmann transport equation, we have discovered a new class of high-performance thermoelectric materials, called supertetrahedral Ga4C-family materials, which exhibit an ultrahigh thermoelectric figure of merit (ZT) due to a large power factor and ultralow lattice thermal conductivity. The power factor is influenced by multiple electronic band degeneracies, flat bands, and valley anisotropy, while the low lattice thermal conductivity is attributed to strong phonon scattering and low phonon group velocity. Moreover, we found that tensile strain engineering can further decrease lattice thermal conductivity while maintaining the multi-band degeneracies, valley anisotropy, and flat bands. In addition to band degeneracy, the scattering mechanism can also greatly affect the power factor during strain implementation. As a result, we observed a novel thermoelectric phenomenon, with Ca4C exhibiting a ZT value larger than 4.4 under a small strain ratio (0.75%). Our theoretical studies not only reveal a new class of high-performance thermoelectric materials with multiple effective mechanisms but also provide a realistic platform for investigating the competitive effects of different factors on enhancing the thermoelectric figure of merit.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Materials Science, Multidisciplinary
Yinong Zhou, Ruqian Wu
Summary: In this study, the possibility of direct control of topological corner states is demonstrated by introducing spin degrees of freedom and local magnetization and electric potential in a rhombus-shaped Kekule nanostructure. By applying local magnetization on one corner, strong spin polarization can be achieved in both corners. Reversal of spin polarization at both corners is achieved by applying local electric potential at the same corner. The robustness of spin polarization control under disorder is also proven, and material realization is demonstrated in a gamma-graphyne nanostructure. Other higher-order lattices and nanostructure shapes are discussed as well. These studies provide a showcase of the remote correlation of quantum states in higher-order topological materials for spintronic and quantum applications.
Article
Chemistry, Multidisciplinary
Yijuan Zheng, Ben Zhang, Tian Ma, Rui Yan, Wei Geng, Zhiyuan Zeng, Yanning Zhang, Shuang Li
Summary: This study employs a facile molten urea method to construct nitrided Rh nanoclusters supported on N-doped carbon (RhxN-NC), which exhibit optimized water bonding and splitting effects and excellent pH-universal hydrogen evolution reaction (HER) performance.
Article
Chemistry, Physical
Hongxian Liu, Chencheng Zhao, Hong Li, Xuelan Li, Xianfeng Mu, Dunhua Hong, Furu Zhong, Zhenxing Fang, Yanning Zhang
Summary: This study explores the possibility of CeO2-supported multi-nuclear NbxSy clusters for HER catalysis using the DFT method. The CeO2 support not only stabilizes the NbxSy clusters, but also acts as a highly efficient electron buffer to regulate the oxidation states of the anchored NbxSy clusters. The interaction between the NbxSy clusters and the CeO2 support reorganizes the electronic structures, leading to excellent HER catalytic performance.
SUSTAINABLE ENERGY & FUELS
(2023)
