Nuclear spin-electron coupling of copper at microkelvin temperatures |
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Authors: | K Gloos P Smeibidl F Pobell |
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Institution: | (1) Physikalisches Institut der Universität, Postfach 101251, W-8580 Bayreuth, Federal Republic of Germany;(2) Present address: Low Temperature Laboratory, Helsinki University of Technology, SF-02150 Espoo, Finland |
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Abstract: | The nuclear spin-electron coupling of copper has been determined by establishing stationary temperature differences between nuclei and electrons at electronic temperatures of 15 K to 5 mK in magnetic fields of 2 mT to 440 mT using a well-defined heat flow from the electrons to the nuclear spin system. The measured Korringa constantk increases proportional toB/T
e
2
with decreasing electronic temperatureT
e
and with increasing magnetic fieldB. At the lowest temperaturesk is more than an order of magnitude larger than its high temperature value. |
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