Article
Chemistry, Physical
Xu Zheng, Jiao Tan, Qianqian Wang, Chan Gao, Xiaohui Yu, Wenhui Xie, Yifeng Yang, Yujie Wang, Changqing Jin
Summary: In this study, MnN single crystal was synthesized under high pressure and temperature, and a first-order phase transition accompanied by an antiferromagnetic to ferromagnetic magnetic structure transition was observed. The magnetic and structural transition of MnN was found to be induced by the enhanced ferromagnetic double exchange interactions in the [001] plane. These findings provide important insights for the development of GaMnN or MnN layer diluted magnetic semiconductor materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Physics, Applied
Alexander Firlus, Juergen E. K. Schawe, Peter G. Weidler, Michalis Charilaou, Joerg F. Loeffler, Andreas U. Gehring
Summary: The monosulfides of the pyrrhotite omission series are important remanence carriers for paleomagnetic reconstruction, and this study reveals the occurrence of intergrown long-range ordered polytypes and a third constituent that exhibits spin-glass behavior.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Physical
You-Hu Chen, Jie Tang, Lu-Chang Qin
Summary: We have developed a simple method for synthesizing diamonds in liquid form through solvothermal reactions of acetone and chlorides. Various characterization techniques including X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, electron diffraction, electron microscopy, and electron energy-loss spectroscopy were employed to confirm the structure and purity of the synthesized cubic diamond (CD). Additionally, the use of Cs-corrected high-resolution transmission electron microscopy revealed the presence of unique carbon dumbbell pairs, further confirming the CD structure. This research provides a straightforward approach for synthesizing diamonds of nanoscale or large sizes in solution.
CHEMISTRY OF MATERIALS
(2023)
Article
Geosciences, Multidisciplinary
Andy Moore, Herwart Helmstaedt
Summary: Framesites are polycrystalline diamonds that differ from monocrystalline diamond varieties in many aspects. They have rapid crystallization textures and short mantle residence time, suggesting formation around the same time as the host kimberlite. The high proportion of garnet inclusions in framesites were previously believed to be from a websteritic paragenesis, but the compositional overlap between websteritic and megacryst garnets makes it inconclusive.
EARTH-SCIENCE REVIEWS
(2023)
Article
Physics, Applied
Jinchao Qiao, Xin Gao, Qiang Zhou, Jianjun Liu, Longhai Zhong, Pengwan Chen
Summary: Black phosphorus quantum dots (BPQDs) were prepared through shock-induced phase transformation using ball-milled red phosphorus nanopowder as precursor. The majority of recovered sample is BPQDs with specific lateral size and thickness. The micromorphology of precursor is critical to the formation of BPQDs.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
A. P. Yelisseyev, E. Zhimulev, Z. A. Karpovich, A. A. Chepurov, V. M. Sonin, A. Chepurov
Summary: This paper reports the results of growing diamonds in an Fe-C melt with the addition of 1% sulfur under high-pressure high-temperature conditions. It was found that adding 1% sulfur can significantly reduce the concentration of nitrogen defects in diamonds, resulting in near-colorless diamonds. The analysis of intense photoluminescence confirms that nitrogen impurities in diamonds mainly exist as single substitutional atoms.
Article
Astronomy & Astrophysics
B. Binaei Ghotbabadi, A. Sheykhi, G. H. Bordbar
Summary: This study investigates the effects of Lifshitz dynamical exponent z on paramagnetic-ferromagnetic phase transition in Lifshitz spacetime, using numerical methods in the probe limit. Results show that critical temperature decreases with increasing power parameter q and dynamical exponent z, and the formation of magnetic moment is harder without an external magnetic field. The magnetic susceptibility satisfies the Curie-Weiss law in the presence of an external magnetic field.
GENERAL RELATIVITY AND GRAVITATION
(2021)
Review
Environmental Sciences
Jingsui Yang, Weiwei Wu, Dongyang Lian, Huichao Rui
Summary: Ophiolites, segments of oceanic lithosphere emplaced onto continental crust, provide insights into processes such as continental rifting, mantle melting, asthenospheric upwelling and cooling of oceanic lithosphere. Chromium spinel and associated mineral inclusions in ophiolitic mantle sections are crucial for understanding the tectonic setting and past histories, with evidence of deep crustal recycling. Ultra-high-pressure minerals and crustal components in ophiolitic peridotites and chromitites suggest incorporation of deep-recycled crustal material, offering a window into deep crustal recycling and mantle dynamics.
NATURE REVIEWS EARTH & ENVIRONMENT
(2021)
Article
Chemistry, Physical
Junjie He, Shuo Li, Liujiang Zhou, Thomas Frauenheim
Summary: This study demonstrates the ultrafast optical control of magnetism in two-dimensional magnets through real-time time-dependent density functional theory. The results provide insights into light-induced interlayer spin and charge dynamics, which could impact magnetic storage technology and spintronics.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Xiaoyan Miao, Si Li, Zhenyi Jiang, Chunmei Zhang, Aijun Du
Summary: By using density functional theory, we investigated the crystalline configuration and electronic structure of the Fe3GeTe2 monolayer under external strain. We found that a moderate compressive strain can break the structural vertical symmetry while retaining the ferromagnetism. Surprisingly, strain-induced polarization in the off-center Fe and Ge atoms barely contributes to the energy states at the Fermi level. The decoupling of conductivity and polarization in the strained Fe3GeTe2 monolayer results in a rare phase with the coexistence of polarization, metallicity, and ferromagnetism, known as magnetic polar metals, which have potential applications in magnetoelectricity and spintronics.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Engineering, Mechanical
Piao Zhou, Tao Sun, Chunjin Wang, Hui Deng, Yongwei Zhu
Summary: This study uses molecular dynamics simulation to investigate the structural evolution and formation of 3C-SiC substrates abraded by diamond at the nanoscale. The results reveal the stable formation of graphene-like 2D structures from SiC and diamond crystalline. This finding has important implications for developing new options in the preparation of graphene-like 2D-SiC.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Li Zhang, Yannan Zhou, Xiaoli Zheng, Jingyun Jiang, Qun Xu
Summary: In this study, defect-rich 2D nonlayered VO2(M) nanosheets were fabricated by strain engineering of CO2 on the metal-insulator transition of VO2, exhibiting unique room-temperature ferromagnetism.
CHEMICAL COMMUNICATIONS
(2021)
Article
Polymer Science
Shengqi Ji, Xiaoyan Yuan, Qianjin Guo, Lixia Ren
Summary: Self-assembly is a universal method to prepare block copolymers with ordered structures, which is very important in organic magnets to align the magnetic centres to enhance ferromagnetic interaction. The amphiphilic magnetic polymers (PTMTBDI[FeCl4]) with para-terphenyl group in the cations and high spin FeCl4- as single spin carrier are prepared by ring-opening metathesis polymerization (ROMP) and post modification. Due to the strong p-p stacking interaction between terphenyl groups, magnetic polymers are self-assembled into macromolecular mono-layer structures with hydrophilic FeCl4- on the two sides and the polymer main chain and side group in the middle in aqueous solution. Fe(III) atoms are arranged in lattice fringe with domain spacing of ca. 2.6 A. Magnetic property studies show that the polymers are changed from paramagnetic to ferromagnetic with hysteresis loops after self-assembly. The ferromagnetic interaction is induced by the close packing and ordered alignment of the Fe(III) atoms. This work unveils a new method to generate ordered structures in angstrom periodicity and thus improve ferromagnetic interaction in organic magnets.
Article
Materials Science, Multidisciplinary
Hao Liu, Huan Zheng, Yamei Wang, Can Huang, Chunlan Ma, Yan Zhu, Hao Yang, Langsheng Ling, Lei Zhang, Jiyu Fan
Summary: In this study, a large-area CrTe film deposited on an Al2O3 substrate was analyzed. The critical exponents β=0.386(3) and γ=1.391(2) were obtained through the analysis of critical isothermal magnetization and the modified Arrott plot. Furthermore, using the renormalization group theory, it was confirmed that CrTe exhibits a quasi-2D Heisenberg-like behavior with long-range interactions. Density functional theory calculations indicated that the CrTe band structure is mainly composed of Cr atom, and the total magnetic moments are determined by the polarized spin-up t(2g) electron of Cr atom.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Yu-Hui Fang, Zheng Liu, Shen Zhou, Peng-Xiang Fu, Ye-Xin Wang, Zi-Yu Wang, Zhe-Ming Wang, Song Gao, Shang-Da Jiang
Summary: This study demonstrates for the first time the feasibility of achieving quantum coherent SEC effect in molecular ferroelectrics by manipulating the zero-field splitting of Mn(II) ions to achieve controllable phase shifts. Detailed investigations reveal the vanishment and enhancement of SEC effects at different crystal orientations.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Geosciences, Multidisciplinary
Kuang He, Sophie C. Roud, Stuart A. Gilder, Ramon Egli, Christoph Mayr, Nikolai Petersen
GEOPHYSICAL RESEARCH LETTERS
(2018)
Article
Chemistry, Multidisciplinary
A. Guenther, R. Hochleitner, E. Schmidbauer, A. Schoettler-Himmel, M. Volk
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2019)
Article
Geochemistry & Geophysics
Michael W. R. Volk, Joshua M. Feinberg
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2019)
Article
Geochemistry & Geophysics
Patrick Arneitz, Ramon Egli, Roman Leonhardt, Karl Fabian
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
(2019)
Article
Geochemistry & Geophysics
Michael W. R. Volk, Michael Eitel, Mike Jackson
GEOPHYSICAL JOURNAL INTERNATIONAL
(2019)
Article
Geochemistry & Geophysics
Andrew P. G. Fowler, Qiu-li Liu, Yongshu Huang, Chunyang Tan, Michael W. R. Volk, W. C. Pat Shanks, William Seyfried
GEOCHIMICA ET COSMOCHIMICA ACTA
(2019)
Article
Geochemistry & Geophysics
Yves Gallet, Michel Fortin, Alexandre Fournier, Maxime Le Goff, Philip Livermore
EARTH AND PLANETARY SCIENCE LETTERS
(2020)
Article
Geochemistry & Geophysics
Dario Bilardello, Subir K. Banerjee, Michael W. R. Volk, Jennifer A. Soltis, R. Lee Penn
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2020)
Article
Physics, Condensed Matter
C. R. S. Haines, S. E. Dutton, M. W. R. Volk, M. A. Carpenter
JOURNAL OF PHYSICS-CONDENSED MATTER
(2020)
Article
Geochemistry & Geophysics
Roger R. Fu, Eduardo A. Lima, Michael W. R. Volk, Raisa Trubko
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2020)
Article
Geochemistry & Geophysics
Maxime Le Goff, Yves Gallet, Nicolas Warme, Agnes Genevey
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
(2020)
Article
Geochemistry & Geophysics
Michael W. R. Volk, Roger R. Fu, Anna Mittelholz, James M. D. Day
Summary: The strength and duration of the martian dynamo are crucial for understanding Mars' habitability and deep interior dynamics. Recent data from the InSight mission show stronger than predicted crustal fields, which can be explained by an older subsurface magnetized layer without a late, active dynamo, supporting a deeply buried, highly magnetized crust in the northern hemisphere of Mars. These findings provide corroborating evidence for the existence of strong, small-scale crustal fields on Mars.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2021)
Article
Geochemistry & Geophysics
Yves Gallet, Maxime Le Goff, Agnes Genevey
Summary: This paper introduces the use of the vibrating sample magnetometer Triaxe and the additional parameter AutoR'(Ti) to interpret the Triaxe measurements. The experiments demonstrate the reliability of the Triaxe procedure and provide alternatives for estimating mean archeointensity values.
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
(2022)
Article
Computer Science, Interdisciplinary Applications
Michael W. R. Volk, Roger R. Fu, Raisa Trubko, Pauli Kehayias, David R. Glenn, Eduardo A. Lima
Summary: This study introduces a method of measuring the magnetic field of rocks using a quantum diamond microscope and develops an open-source software toolbox called QDMlab for generating and analyzing magnetic field maps of geologic samples.
COMPUTERS & GEOSCIENCES
(2022)
Article
Geosciences, Multidisciplinary
Roger R. Fu, Michael W. R. Volk, Dario Bilardello, Guy Libourel, Geoffroy R. J. Lesur, Oren Ben Dor
Summary: The study suggests that the magnetization of the Allende carbonaceous chondrite meteorite may have originated from reactions between Fe-bearing minerals and aqueous fluids on the parent asteroid around 3.0-4.2 million years after solar system formation, in a magnetic field of >40 mu T. This supports the idea that the early solar system's magnetic field had a nebular origin rather than dynamo or solar wind alternatives.