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Abstract:
The presence of Ru-O bilayers in the layered perovskite metal Sr3Ru2O7
could be intuitively expected to result in a doubling of the electronic
structure of Sr2RuO4, i.e. four electron-like and two hole-like Fermi
surface sheets. To check this, we have studied the weak-field Hall
effect of Sr3Ru2O7 between 30 mK and 300 K. In contrast to the Hall
coefficient ;in Sr2RuO4, which has two temperature dependent sign
changes and is negative at low temperatures, that of Sr3Ru2O7 is
positive over the whole range studied. Possible implications for its
electronic structure are discussed. (C) 2000 Elsevier Science B.V. All
rights reserved.
