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  • 1
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    Investigation of structure and magnetic properties of Ru-doped YMnO3 (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-07-26
    Description: A series of polycrystalline YMn 1−x Ru x O 3 (0 ≤ x ≤ 0.2) samples were prepared by traditional solid-state reaction method. Effects of doping on the microstructures and magnetic properties were investigated. Microstructural results reveal that samples crystallize in a single hexagonal structure with P 6 3 cm group for x ≤ 0.1. Lattice parameters a, c, and unit-cell volume of YMn 1−x Ru x O 3 are found to increase with doping content, which are ascribed to the larger radius of Ru 3+ than that of Mn 3+ . Weak ferromagnetism is found and is enhanced with increasing doping concentration x. The bond angles of Mn-O3-Mn and Mn-O4-Mn are changed in the opposite trends, which break the Mn-Mn exchange interaction, thus the antiferromagnetic ordering. The MnO 5 bipyramid is found to be relieved and the trimerization of Mn ions is weakened. These structural modifications result in the increase of weak ferromagnetism ordering in samples.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 2
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    Charge transfer and orbital reconstruction in the (La2/3Sr1/3MnO3)m/(SrRuO3)n superlattices (2015)
    American Institute of Physics (AIP)
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    Publication Date: 2015-05-13
    Description: The structural, electronic, and magnetic properties of (La 2/3 Sr 1/3 MnO 3 ) m /(SrRuO 3 ) n superlattices have been investigated based on the first principles calculations. An obvious Jahn-Teller distortion, which depends on m, n, appears in MnO 6 octahedron in the superlattices. The stretch along c -axis of MnO 6 octahedron at the interface lifts the Mn e g orbital degeneracy, with electrons preferring the lower energy 3 z 2 − r 2 to the higher energy x 2 − y 2 . Benefitting from the charge transfer at the interface, the still occupied x 2 − y 2 orbital can mediate a robust in-plane double exchange interaction. La 2/3 Sr 1/3 MnO 3 block is ferromagnetic and metallic, even for the superlattice with m = n = 1.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 3
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    Strain controlled orbital state and magnetization in insulating LaMnO3+δ films (2015)
    American Institute of Physics (AIP)
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    Publication Date: 2015-04-29
    Description: LaMnO 3+δ films with various thicknesses were grown on LaAlO 3 (001) single crystal substrate to investigate the effect of in-plane compressive strain (∼−0.57%) on magnetic properties. All films exhibit a blocking temperature T b at which the zero field cooled magnetization reaches a maximum, indicating the ferromagnetic (FM) nanoclusters are embedded in the background of antiferromagnetic (AFM) matrix. The onset temperature of FM transition T c and T b is increased by 24% and 89%, respectively, with the thickness decreasing from 82.4 nm to 9.2 nm. Simultaneously, the saturation magnetization greatly increases by 309%, which is ascribed to the strain-induced transition of AFM to FM phase due to the orbital order structure switching from x 2 − 1/y 2 −1 [A-type] to (x 2 − y 2 ) + (z 2 − 1) [F-type].
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 4
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    Dimensional crossover in the electrical and magnetic properties of the layered LaSb_{2} superconductor under pressure: The role of phase fluctuations (2011)
    American Physical Society (APS)
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    Publication Date: 2011-06-01
    Description: Author(s): S. Guo, D. P. Young, P. W. Adams, X. S. Wu, Julia Y. Chan, G. T. McCandless, and J. F. DiTusa We present electrical transport, magnetization, and ac as well as dc magnetic susceptibility measurements of the highly anisotropic compound LaSb 2 . Our data display a very broad anisotropic transition upon cooling below 2.5 K into a clean superconducting state with a field-dependent magnetization th... [Phys. Rev. B 83, 174520] Published Tue May 31, 2011
    Keywords: Superfluidity and superconductivity
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 5
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    Multicavity X-Ray Fabry-Perot Resonance with Ultrahigh Resolution and Contrast (2012)
    American Physical Society (APS)
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    Publication Date: 2012-06-01
    Description: Author(s): X. R. Huang, D. P. Siddons, A. T. Macrander, R. W. Peng, and X. S. Wu Realization of x-ray Fabry-Perot (FP) resonance in back-Bragg-reflection crystal cavities has been proposed and explored for many years, but to date no satisfactory performance has been achieved. Here we show that single-cavity crystal resonators intrinsically have limited finesse and efficiency. To... [Phys. Rev. Lett. 108, 224801] Published Thu May 31, 2012
    Keywords: Plasma and Beam Physics
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 6
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    Ferromagnetism in CuFeSb: Evidence of competing magnetic interactions in iron-based superconductors (2012)
    American Physical Society (APS)
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    Publication Date: 2012-04-27
    Description: Author(s): B. Qian, J. Lee, J. Hu, G. C. Wang, P. Kumar, M. H. Fang, T. J. Liu, D. Fobes, H. Pham, L. Spinu, X. S. Wu, M. Green, S. H. Lee, and Z. Q. Mao We have synthesized a new layered iron-pnictide CuFeSb. This material shares a similar layered tetragonal structure with iron-based superconductors, with Fe square planar sheets forming from the edge-sharing iron antimony tetrahedral network. CuFeSb differs remarkably from Fe-based superconductors i... [Phys. Rev. B 85, 144427] Published Thu Apr 26, 2012
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 7
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    Structural Variability of the Nightside Martian Ionosphere Near the Terminator: Implications on Plasma Sources (2019)
    Wiley
    Details
    Publication Date: 2019
    Description: Abstract With the aid of the Neutral Gas and Ion Mass Spectrometer measurements made onboard the Mars Atmosphere and Volatile Evolution, we examine the morphology of the nightside Martian ionosphere near the terminator at 150–250 km in terms of the extension into darkness for a selected set of ion species: O , NO+, HNO+, N /CO+, CO , and HCO+. Our analysis reveals several interesting characteristics, including the presence of dawn‐dusk and north‐south asymmetries and the variability among different species. A full interpretation of the Neutral Gas and Ion Mass Spectrometer observations relies on the combination of impact ionization by precipitating electrons and day‐to‐night plasma transport, as two important sources of plasma in the nightside Martian ionosphere near the terminator. The former partially contributes to the north‐south asymmetry, whereas the latter favorably explains not only the dawn‐dusk asymmetry but also NO+ and HCO+ as two exceptions which are more extended into darkness as compared to the other species on the dusk side. A comparison between the two plasma sources further indicates that the effect of day‐to‐night transport tends to be suppressed over the southern hemisphere. The above results highlight the impacts of crustal magnetic fields on the structural variability of the nightside Martian ionosphere near the terminator, manifest as the shielding of precipitating electrons and the suppression of day‐to‐night transport, both by the presence of strong magnetic anomalies clustering over the southern hemisphere of the planet.
    Print ISSN: 2169-9097
    Electronic ISSN: 2169-9100
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 8
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    The morphology of the topside Martian ionosphere: Implications on bulk ion flow (2019)
    Wiley
    Details
    Publication Date: 2019
    Description: Abstract Prior to the Mars Atmosphere and Volatile Evolution (MAVEN) mission, the only information on the composition of the Martian ionosphere came from the Viking Retarding Potential Analyzer data, revealing the presence of substantial ion outflow on the dayside of Mars. Extensive measurements made by the MAVEN Neutral Gas and Ion Mass Spectrometer allow us to examine the morphology of the Martian ionosphere not only in unprecedented detail but also on both the dayside and the nightside of the planet. Above 300 km, various ionospheric species present a roughly constant density scale height around 100 km on the dayside and 180 km on the nightside. An evaluation of the ion force balance, appropriate for regions with near horizontal magnetic field lines, suggests the presence of supersonic ion outflow predominantly driven by the ambient magnetic pressure, with characteristic dayside and nightside flow velocities of 4 km s−1 and 20 km s−1, respectively, both referred to an altitude of 500 km. The corresponding total ion outflow rates are estimated to be 5 × 1025 s−1 on the dayside and 1 × 1025 s−1 on the nightside. The data also indicate a prominent variation with magnetic field orientation in that the ion distribution over regions with near vertical field lines tends to be more extended on the dayside but more concentrated on the nightside, as compared to regions with near horizontal field lines. These observations should have important implications on the pattern of ion dynamics in the vicinity of Mars.
    Print ISSN: 2169-9097
    Electronic ISSN: 2169-9100
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 9
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    Normal and inverse bulk spin valve effects in single-crystal ruthenates (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-04-23
    Description: The current-perpendicular-to-plane magnetoresistivity (CPP-MR) / ρ c ( B ) is investigated in single crystal ruthenates Ca 3 (Ru 1− x Ti x ) 2 O 7 ( x  = 0.02). This material is naturally composed of ferromagnetic metallic bilayers (Ru,Ti)O 2 separated by nonmagnetic insulating layers of Ca 2 O 2 , resulting in tunneling magnetoresistivity. Non-monotonic ρ c ( B ) curves as well as the inverse spin valve effect are observed around the magnetic phase transition associating with the metal-to-insulator transition. A spin dependent tunneling model with alternate distribution of hard and soft magnetic layers [(Ru,Ti)O 2 ] is proposed to explain the exotic CPP-MR behavior. This eccentric CPP-MR behavior highlights the strong spin-charge coupling in double-layered ruthenates and provides a potential material for spintronic devices.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 10
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    Phenotypes of mouse diabetes and rat fatty due to mutations in the OB (leptin) receptor (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-02-16
    Description: Mice harboring mutations in the obese (ob) and diabetes (db) genes display similar phenotypes, and it has been proposed that these genes encode the ligand and receptor, respectively, for a physiologic pathway that regulates body weight. The cloning of ob, and the demonstration that it encodes a secreted protein (leptin) that binds specifically to a receptor (OB-R) in the brain, have validated critical aspects of this hypothesis. Here it is shown by genetic mapping and genomic analysis that mouse db, rat fatty (a homolog of db), and the gene encoding the OB-R are the same gene.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chua, S C Jr -- Chung, W K -- Wu-Peng, X S -- Zhang, Y -- Liu, S M -- Tartaglia, L -- Leibel, R L -- DK26687/DK/NIDDK NIH HHS/ -- DK47473/DK/NIDDK NIH HHS/ -- HD28047/HD/NICHD NIH HHS/ -- New York, N.Y. -- Science. 1996 Feb 16;271(5251):994-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Human Behavior and Metabolism, Rockefeller University, New York 10021, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8584938" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; Blotting, Southern ; Carrier Proteins/*genetics ; Chromosome Mapping ; Cloning, Molecular ; DNA Mutational Analysis ; Diabetes Mellitus/*genetics ; Genetic Markers ; Leptin ; Mice ; Mice, Inbred C57BL ; Mice, Inbred Strains ; Molecular Sequence Data ; Obesity/*genetics ; Phenotype ; Polymerase Chain Reaction ; Proteins/genetics ; Rats ; Rats, Inbred Strains ; *Receptors, Cell Surface ; Receptors, Cytokine/*genetics ; Receptors, Leptin
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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