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  • 2000-2004  (5)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Nitrogen use strategies of neotropical rainforest trees in threatened Atlantic Forest (2003)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 26 (2003), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The characteristics of nitrogen acquisition, transport and assimilation were investigated in species of an Atlantic Forest succession over calcareous soil in south-eastern Brazil. Differences in behaviour were observed within the regeneration guilds. Pioneer species showed high leaf nitrogen contents, a high capacity to respond to increased soil nitrogen availability, a high capacity for leaf nitrate assimilation and were characterized by the transport of nitrate + asparagine. At the other end of the succession, late secondary species had low leaf nitrogen contents, little capacity to respond to increased soil nitrogen availability, low leaf nitrate assimilation and were active in the transport of asparagine + arginine. The characteristics of nitrogen nutrition in some early secondary species showed similarities to those of pioneer species whereas others more closely resembled late secondary species. Average leaf δ15N values increased along the successional gradient. The results indicate that the nitrogen metabolism characteristics of species may be an additional ecophysiological tool in classifying tropical forest tree species into ecological guilds, and may have implications for regeneration programmes in degraded areas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3040.2003.00970.x
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  • 2
    Electronic Resource
    Electronic Resource
    Plutonium-based superconductivity with a transition temperature above 18 K (2002)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 420 (2002), S. 297-299 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Plutonium is a metal of both technological relevance and fundamental scientific interest. Nevertheless, the electronic structure of plutonium, which directly influences its metallurgical properties, is poorly understood. For example, plutonium's 5f electrons are poised on the border ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature01212
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    UCu4Pd: A Disordered Antiferromagnetic Compound (2000)
    Springer
    Journal of low temperature physics 121 (2000), S. 105-113 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present a systematic study of the specific heat and ac- as well as dc-susceptibility in various fields and frequencies down to 60 mK in the non-Fermi liquid system UCu5−x Pd x . The results show that, although the specific heat data of UCu4Pd increase logarithmically above 200 mK, it orders antiferromagnetically below T N=190 mK while simultaneously showing evidence for spin glass behavior possibly due to random occupation of the 16e site with palladium. For UCu3.5Pd1.5 our measurements reveal spin glass behavior with an anomalously high shift with frequency of the freezing temperature (T f) of the ac-susceptibility at the beginning of the spin glass phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026408610127
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  • 4
    Electronic Resource
    Electronic Resource
    Crossover to Fermi-Liquid Behavior at Lowest Temperatures in Pure CeNi2Ge2 (2000)
    Springer
    Journal of low temperature physics 119 (2000), S. 147-153 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present a low temperature study of the nearly antiferromagnetic heavy Fermion compound CeNi2Ge2 including specific heat measurements in magnetic fields up to 13 T, resistivity, magnetization, DC- and AC- susceptibility measurements down to 30 mK. The results show that, although the system is close to a quantum critical point, CeNi2Ge2 exhibits Fermi-liquid behavior below approximately 300 mK. At higher temperatures hyperscaling indicates the existence of strong coupling spin fluctuations responsible for the observed non-Fermi-liquid properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004616704032
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  • 5
    Electronic Resource
    Electronic Resource
    Low Temperature Specific Heat of CeRu2Si2 at the Field Induced Metamagnetic Instability (2000)
    Springer
    Journal of low temperature physics 118 (2000), S. 235-239 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report specific heat measurements in a broad temperature range between 0.06 and 20 K on single crystalline CeRu2Si2 in magnetic fields applied parallel to the c-direction around the critical field B M , where the metamagnetic transition from the itinerant to the localized state takes place. In the critical field B M ∥ c=7.8 T a distinct deviation from the usual Fermi- liquid behavior is found down to our lowest temperature. Below 1.8 K C/T varies as (1−aT), while for 1.8 K〈T〈20 K a power law T λ−1 with λ=0.66 is found. Small deviations from the critical magnetic field leads to the recovery of a Fermi-liquid ground state. The observed behavior of the specific heat at the field induced magnetic instability is discussed in the context of a non-Fermi-liquid state and compared with those for the field-induced nFl CeCu6−x Ag x and the recent observation of nFl behavior at B M in UPt3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004651225026
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