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  • 1
    Electronic Resource
    Electronic Resource
    Stability of the low-temperature tetragonal phase in La2−x Ba x CuO4 and related compounds (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 33-35 
    Details
    ISSN: 1572-9605
    Keywords: Low-temperature tetragonal (TLT) phase ; La2−x Ba x−y M y CuO4 (M=Sr or Ca) ; La2−x−y Nd y Ba x CuO4 ; ionic size
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract In La2−x Ba x CuO4 (LBCO), the structural transition to a low-temperature tetragonal phase below 60 K and suppression of superconductivity are observed when the carrier density isp ∼ 1 /8 per copper. The replacement by divalent ions smaller than Ba2+ suppresses the static deformation of the lattice. We have found that the variationsT d2 and superconducting transition temperatureT c are quantitatively characterized by the averaged ionic radius at the La site or lattice parameters. This aspect of substitution could be regarded as the effect of chemical pressure, since similar variations have been reported on applying hydrostatic pressure. In La2−x−y Nd y (Ba, Sr) x CuO4,T d2 increases with increasingy in a wide range ofp whileT c is suppressed only at p∼ l /8. The structural transition atT d2 here should be ascribed mainly to the crystallochemical origin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00730363
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Electrophysiological determinations of the effects of 1 kHz noise exposure on the high-frequency hearing of guinea pigs (1990)
    Springer
    European archives of oto-rhino-laryngology and head & neck 247 (1990), S. 206-210 
    Details
    ISSN: 1434-4726
    Keywords: Low-frequency tones ; High frequency hearing ; Cochlear microphonics ; Action potentials ; Endocochlear potential
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effects of noise were studied in 90 5-week-old albino Hartley guinea pigs with normal hearing. The following experimental setup was used: (1) exposure to 1 kHz tones at 100 dB for 4 h, 20 h and 40 h; (2) exposure to 1 kHz tones at 110 dB for 20 h and 40 h. In order to investigate the effects of the noise exposures on the hearing of the guinea pigs, cochlear microphonics (CM), whole nerve action potentials (AP) and endocochlear potentials (EP) were examined. We obtained the following results. With a high sound pressure, a decrease was observed in the CM maximum output voltage in the test frequencies from 2 kHz to 6 kHz while the CM threshold increased (“pseudo threshold”). Intensity function of the N1 potential of the AP using a 7 kHz tone burst decreased; the threshold of the N1 potential also increased considerably by exposure to chronic high sound pressure. An extension of latency and a decrease in the absolute value of the negative potential in EP were induced by chronic noise exposure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00178985
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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