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  • American Institute of Physics (AIP)
  • Molecular Diversity Preservation International (MDPI)
  • 1
    Electronic Resource
    Electronic Resource
    Low frequency pulse excitation in zero field magnetic resonance (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 6623-6635 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Zero field magnetic resonance experiments using semiselective excitation by low frequency pulses are analyzed. The prospects of phase cycling experiments in zero field are discussed and the differences between excitation by low frequency and direct current pulses are outlined. It is demonstrated that despite the selectivity of excitation all three transitions in a three-level system are observed. Deuterium quadrupolar resonance and computer simulations are employed to verify predictions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455384
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Chromium and nickel ion irradiation effects on the low- and high-temperature metal-semiconductor transitions in (V1−xCrx)2O3 ceramics (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 5646-5652 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Chromium doped vanadium sesquioxide [(V1−xCrx)2O3] ceramic samples have been irradiated using medium energy chromium and nickel ions (52Cr:572 MeV, 64Ni:640 MeV) at various fluences (4×1011–1.1×1014 ions/cm2) and doping rates (x=0.3, 0.6, and 0.7). Irradiation has been carried out under vacuum and at room temperature. Irradiated samples have been characterized by electrical resistivity measurements as a function of temperature for the low- and the high-temperature transitions in the (V1−xCrx)2O3 system. Irradiation by chromium and nickel ions creates bilayered samples as the ions mean projected range were smaller than the sample thickness. The bilayer structure is characterized by two transitions at low temperature. Dealing with the high temperature positive temperature coefficient transition, the negative temperature coefficient behavior above this transition has been considerably attenuated due to the bilayered structure. In situ measurements on an irradiated sample have shown that after annealing the electrical characteristics for the low- and the high-temperature transitions tend to be close to those of an unirradiated sample. However, even an annealing at 380 °C does not eliminate all the irradiation effects. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363616
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  • 3
    Electronic Resource
    Electronic Resource
    Does continuous trail of damage appear at the change in the electronic stopping power damage rate? (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 1545-1549 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Y3Fe5O12 samples have been irradiated by Kr ions with incident energies between 9 and 37 MeV/A and Xe ions between 9 and 25 MeV/A. In this way a range of electronic stopping power between 7 and 28 MeV/μm has been explored. The irradiated samples have been etched chemically. A homogeneous track etching radius is observed after xenon irradiation but not after krypton irradiation. This result indicates that at an electronic stopping power value (dE/dx) of 17±3 MeV/μm a change in the damage morphology occurs: above this value the latent track becomes continuous cylinder. This value of stopping power is markedly higher than the dE/dx (8±1 MeV/μm) at which we have previously observed a change in the latent track damage rate and in the damage morphology from spherical to cylindrical shape of the defects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346631
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic properties of chromium doped rare earth manganites Ln0.5Ca0.5Mn1−xCrxO3 (Ln=Pr, Nd, Sm and 0.05≤x≤0.10) by soft x-ray magnetic circular dichroism (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 2616-2621 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Soft-x-ray magnetic circular dichroism (SXMCD) at Mn, Cr L2,3 and Ln M4,5 edges of Ln0.5Ca0.5Mn1−xCrxO3 (Ln=Pr, Nd, Sm and 0.05≤x≤0.10) bulk polycrystalline samples have been performed at T=20 K below the ferromagnetic Curie temperature. We show the existence of magnetic sublattice on each of the probed cations. Chromium cations order at low temperature antiparallel to the manganese subnetwork and rare earth cations likely exhibit a sperimagnetic ordering. These results are compared with magnetization measurements and a tentative correlation with magnetoresistance properties is discussed. This work also demonstrates that SXMCD can probe element and site specific magnetic properties of multicomponent systems. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371100
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  • 5
    Electronic Resource
    Electronic Resource
    Use of electron beam lithography to selectively decompose metalorganics into patterned thin-film superconductors (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 526-528 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fine line superconductors, approximately 5 μm in width and 260 nm thick, were formed from Y-Ba-Cu on 〈100〉SrTiO3 by the combined methods of metalorganic deposition and selective area electron beam exposure. The lines were written in metal neodecanoates using an electron beam having a spot size of 0.25 μm and an energy of 25 kV. The dosage of the exposure was 1200 μC/cm2. Unexposed areas were removed with a 30 s xylene wash. A 500 °C pyrolysis in air for 300 s followed by rapid thermal annealing in oxygen produced lines having superconducting onsets above 90 K and zero resistance at 69 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100625
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  • 6
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    Chemical pressure effects on crystal and magnetic structures of bilayer manganites PrA2Mn2O7 (A = Sr or Ca) (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-06-04
    Description: The crystal and magnetic structures of the bilayer manganites PrSr 2 Mn 2 O 7 (PSMO) and PrCa 2 Mn 2 O 7 (PCMO) have been studied by neutron powder diffraction. It was found that PSMO crystallizes in space group I4/mmm, while PCMO adopts space group Cmc2 1 at room temperature. The difference in the structure arises from chemical pressure induced by the Ca substitution for Sr on the A sites, which causes different Jahn-Teller distortions. In PSMO, the MnO 6 octahedra suffer a small elongated distortion, while those in PCMO adopt strong compressed distortion along the axial direction. In addition, the octahedra in PCMO show a + b 0 c 0 rotation and a 0 b + c + tilting in the Glazer notation in comparison to PSMO. As a result, these two compounds adopt very different magnetic structures: The magnetic structure of PSMO is an A-type magnetic structure (Im'm'm) with propagation vector k = (0, 0, 1) and magnetic moments in the ab plane. In contrast, a C-type antiferromagnetic magnetic structure (Cm'c2′ 1 ) with the multiple propagation vectors (k = (0, 1 2 , 1 2 ) and (0, 1 2 , 0)) and magnetic moments mainly along the b axis is found in PCMO. The critical exponent of the magnetic phase transition is around 0.345 for PSMO and 0.235 for PCMO, indicating 3D and 2D XY transitions, respectively. The strong Jahn-Teller distortion induced by the chemical pressure is believed to suppress the double exchange and favour super-exchange in PCMO, leading to the dramatic difference in the magnetic structure.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 7
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    Collapse and reappearance of magnetic orderings in spin frustrated TbMnO3 induced by Fe substitution (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-09-08
    Description: We studied the temperature dependent magnetic phase evolution in spin frustrated TbMnO 3 affected by Fe doping via powder neutron diffraction. With the introduction of Fe (10% and 20%), the long range incommensurate magnetic orderings collapse. When the Fe content is increased to 30%, a long-range antiferromagnetic ordering develops, while a spin reorientation transition is found near 35 K from a canted G-type antiferromagnetic ordering to a collinear G-type antiferromagnetic ordering. This work demonstrates the complex magnetic interactions existing in transition metal oxides, which helps to understand the frustrated spin states in other similar systems and design magnetic materials as well.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 8
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    In-plane Van der Waals interactions of molecular self-assembly monolayer (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-02-26
    Description: We demonstrate that the Van der Waals interactions in plane are important to control molecular self-assembly structure as well their phase transition. Using precise chemical modification to mediate such in-plane cohesive interactions, we observed the spontaneous formations of 2D order or disorder molecular self-assembly structures, as well their order-disorder phase transitions by annealing. Interestingly, we identified that the side alkyl chains stand up at surfaces and form the ‘locked’ pairs/windmill structures. Moreover, we realized the covalent coupling based on ethynyl functionality before molecular desorption from metal surfaces, by enhancing the in-plane interactions.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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