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  • 1
    Electronic Resource
    Electronic Resource
    Magnetoacoustics in low dimensional spin systems in pulsed magnetic fields (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 7055-7057 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present results on sound wave propagation in pulsed fields up to 50 T for CsCuCl3 and (VO)2P2O7. Sound velocity and attenuation exhibit anomalies at the field induced spin transitions at low temperatures. In CsCuCl3 we observe step-like anomalies in sound velocity and pronounced peaks in attenuation at the saturation field (34 T at 1.5 K) and broader anomalies at the commensurate-incommensurate transition (14–17 T). In (VO)2P2O7 we observe a strong anomaly at the critical field when the lowest triplet branch crosses the singlet ground state (27 T at 1.6 K). All these experiments give important information on the spin state in high magnetic fields of these low dimensional spin systems and on the spin-phonon coupling. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372929
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  • 2
    Electronic Resource
    Electronic Resource
    Elastic properties of ferromagnetic EuB 6 (2001)
    Springer
    The European physical journal 22 (2001), S. 327-333 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 62.65.+k Acoustical properties of solids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Results of an ultrasonic investigation of EuB6 at low temperatures are reported. Both longitudinal and transverse acoustic modes exhibit anomalies in the vicinity of the low-temperature phase transitions of EuB6. The ultrasound data serve to establish part of the B-T phase diagram of EuB6. At magnetic fields exceeding 3 T, magneto-acoustic quantum oscillations (MAQO) are observed. The nature of the acoustic anomalies and possible phases in external magnetic fields are discussed. Also a comparison with the elastic properties of other rare-earth (RE) hexaboride compounds is made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01312802
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  • 3
    Electronic Resource
    Electronic Resource
    Electron-phonon interaction in LaAg (1987)
    Springer
    The European physical journal 68 (1987), S. 291-298 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Magnetoacoustic de Haas-van Alphen data on LaAg are compared with a new relativistic band structure calculation including La-4f states. We find convincing agreement of the measured and calculated dHvA frequencies. The deformation of the Fermi surface under strain is determined from the magnetoacoustic dHvA amplitude. The strongest deformation potential coupling is found for three equivalent pockets which become inequivalent under orthorhombic strain. The lifting of their degeneracy leads to the softening of theT 3 elastic constant. This is different from the useual band Jahn-Teller effect which is based on the lifting of subband degeneracy at a single point ink-space.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01304242
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetoacoustic quantum oscillations in the heavy fermion superconductor UBe13 (1991)
    Springer
    The European physical journal 85 (1991), S. 159-160 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In UBe13 magnetoacoustic quantum oscillations (MAQO) are observed for the attenuation- and the sound velocity-changes in the superconducting and normal state. The observed extremal areas and the effective masses are small.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01313215
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  • 5
    Electronic Resource
    Electronic Resource
    Charge ordering and elastic constants in Fe Zn O (2000)
    Springer
    The European physical journal 13 (2000), S. 491-494 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 71.30.+h Metal-insulator transitions and other electronic transitions - 62.65.+k Acoustical properties of solids - 75.40.Cx Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We present the temperature dependence of elastic modes of Fe3-xZnxO4 with x = 0, x = 0.02 and x = 0.032. The c44 shear modes show a pronounced softening which can be normalized to a common behavior for all these substances. We can explain the softening with a bilinear coupling of the elastic strain to an order parameter linked to charge ordering processes. The other elastic modes (c11, c12 and the bulk modulus) do not show any softening. We present a symmetry analysis for the charge ordering model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050060
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  • 6
    Electronic Resource
    Electronic Resource
    Structural instability and superconductivity in (2000)
    Springer
    The European physical journal 16 (2000), S. 59-66 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 62.65.+k Acoustical properties of solids - 74.72.-h High- compounds
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We report results of the ultrasonic investigation of Ba1-xKxBiO3 superconducting (SC) single crystals for two potassium concentrations and in a wide temperature range including the normal and the SC states. An instability of the crystal lattice that develops above the superconducting phase transition leads to a softening of both the transverse c44 and the longitudinal c11 modes at temperatures between 200 K and 50 K. In the case of Ba0.65K0.35BiO3 a pronounced hysteresis was discovered. Low temperature X-ray powder diffraction analysis does not reveal any change of the cubic structure in the samples within a resolution of our X-ray technique. The softening of the elastic moduli, the hysteresis, the maximum in the attenuation of sound along with the possible short- (or long-) range structural distortion can be explained qualitatively in a simple model by assuming a coupling of the acoustic modes with the anharmonic oscillations of BiO6 octahedra. Some weak anomalies are discovered in the velocity of the longitudinal sound in the vicinity of the superconducting phase transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510070249
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  • 7
    Electronic Resource
    Electronic Resource
    Lattice effects in singlet ground state systems (1976)
    Springer
    The European physical journal 25 (1976), S. 41-48 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have investigated elastic, magnetic, thermal and structural properties of systems which exhibit induced magnetic behavior (TbP, PrSn3, Pr3Se4, Pr3Te4). Particular emphasis is given to phonon effects due to the crystalline electric field, phase transitions, and magnetic fields. TbP has a first order magnetic phase transition and both TbP, PrSn3 show a temperature dependence of the elastic constants, which can be explained with the known crystal field level scheme. The compounds Pr3S4, La3S4, Pr3Se4 exhibit structural instabilities at much higher temperatures than the magnetic or superconducting transition temperatures. Pr3Te4 does not exhibit a structural transition, but a strong elastic softening in a magnetic field. This effect is due to strong field dependent quadrupole transitions. All these systems are analyzed with respect to typical induced moment parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01343308
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  • 8
    Electronic Resource
    Electronic Resource
    Singlet ground state magnetism: II. magnetic excitons in paramagnetic TbP (1979)
    Springer
    The European physical journal 35 (1979), S. 253-259 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The magneticΓ 1 –Γ 4 exciton of the singlet ground state system TbP has been studied by inelastic neutron scattering above the antiferromagnetic ordering temperature. Considerable dispersion and a pronounced splitting was found in the [100] and [110] directions. Both the band width and the splitting increased rapidly as the transition temperature was approached in accordance with the predictions of the RPA-theory. The dispersion is analysed in terms of a phenomenological model using interactions up to the fourth nearest neighbour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01319845
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  • 9
    Electronic Resource
    Electronic Resource
    LaAg x In1−x (1980)
    Springer
    The European physical journal 39 (1980), S. 151-158 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The phonon dispersion of LaAg x In1−x (x=1, 0.89, 0.8) has been studied by inelastic neutron scattering in the cubic high temperature phase. A soft mode behaviour was observed at theM-point. The doubling and the cubic to tetragonal deformation of the elementary cell was observed through the phase transition. The measurements of the elastic constants were extended to 450 K and their magnetic field dependence was investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01301521
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  • 10
    Electronic Resource
    Electronic Resource
    Physical factors influencing refraction of the echolocative sound beam in delphinid cetaceans (1979)
    Springer
    Marine biology 52 (1979), S. 285-290 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The delphinid melon has been postulated to function as a “sound lens” in which lipids refract and collimate the ultrasonic beam used for echolocation. To identify the major physical factors influencing sound-beam refraction, lipid samples from the 4 regions of the Tursiops truncatus melon were examined for variation of sound velocity with temperature. These results were then combined with available sound velocity data for Tursiops sp. melon tissue, Globicephala melaena melon lipids, G. melaena melon tissue, and seawater to model the total melon/seawater system encountered by the projected sound beam in both delphinids. Our analysis suggests that much of the refractive collimation occurs at the tissue/seawater interface rather than in the main body of the delphinid melon. Abrupt changes in the temperature and sound velocity at or near this convex interface (the forehead) cause this refraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00398142
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