Gordon Godfrey Theoretical Seminar 2004
Spin,
Charge and Orbital and Their Excitations in Transition Metal Oxides
Prof.
Sadamichi Maekawa
Institute for Materials Research, Tohoku University, Sendai 980-8577,
Japan
Tuesday,
December 7, 12.00, room 5
Abstract
There are two kinds of physics; one is to search for elements in nature
and the other is to examine the diversity of nature. An electron is
an elementary particle. However, when many of them interact strongly
in materials, they give rise to a variety of quantum phenomena. In addition,
electrons cannot often keep their own properties in such correlated
states. They exhibit collective excitations which are based on their
internal degrees of freedom, i.e., spin, charge and orbital. In transition
metal oxides such as high temperature superconducting cuprates and colossal
magnetoresistive manganites, these novel excitations have recently been
obtained. These excitations and their application in nano-technology
such as spin-electronics and opto-electronics are discussed.
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