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Aspect of Spin-Charge Separation due to Antiferromagentic Spin Fluctuations in Technically Nested 2D Metals

By Kazumasa Miyake and Osamu Narikiyo


It is shown that the charge susceptibility in nearly half-filled two-dimensional (2D) metals, with technically nested Fermi surface, shows anomaly at the wavevector different from that for the spin susceptibility at low temperatures. Namely charge degrees of freedom behave there as if their “Fermi surface” corresponded to that of “holes ” created in the Mott insulator. Such anomaly is caused by the Aslamazov-Larkin type contribution of 2D antiferromagnetic spin fluctuations. This phenomenon gives a possible clue to resolve the paradox of normal state properties of high-Tc cuprates starting from the Fermi-liquid fixed point. Typeset using REVTEX 1 Since the discovery of high-Tc cuprates, it has been a central issue how to understand the anomalous properties in the normal state [1,2]. Among them the most exotic one is that the charge degrees of freedom behave as if they were “holes ” created in the Mott insulator by doping while the spin degrees of freedom show a response reflecting the existence of larg

Year: 1994
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