Making High T$_c$ Higher: A Theoretical Proposal

Steven Kivelson

doi:10.1016/S0921-4526(02)00775-5

paper

Making High T $_{c}$ Higher: A Theoretical Proposal

arXiv:cond-mat/0109151 · doi:10.1016/S0921-4526(02)00775-5

Abstract

There is considerable evidence that the highest $T_{c}$ obtainable in a copper-oxide plane is limitted by the competition between two effects: On the one hand, as the concentration of doped-holes, $x$ , is increased, the pairing scale, which is related to the properties of a doped Mott insulator, decreases. On the otherhand, the superfluid density, which controls the stiffness of the system to phase fluctuations, vanishes as $x \to 0$ , and increases with increasing $x$ . Optimal $T_{c}$ is obtained at a crossover from a phase ordering dominated regime at small $x$ to a pairing dominated regime at large $x$ . If this description is valid, then higher $T_{c}$ 's can be obtained in an array of coupled planes with different doped hole concentrations, such that a high pairing scale is derived from the underdoped planes and a large phase stiffness from the optimally or overdoped ones.

6 pages

Making High Tc​ Higher: A Theoretical Proposal

Abstract

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Making High T $_{c}$ Higher: A Theoretical Proposal