Universal Charge and Spin Response in Optimally Doped Antiferromagnets

Abstract

Charge and spin response in the planar $t-J$ model at finite temperatures are investigated numerically, in the regime corresponding to cuprates at intermediate doping. We show that the local spin correlation function is $T$-independent, leading to ${\chi }^{\prime \prime }(\omega <J)\propto \tanh (\omega /2T)$. The current correlation function $C(\omega )$ appears to be $T$- as well as $\omega$-independent, and the optical conductivity $\sigma \propto (1-e^{-\omega /T})/\omega$. Such anomalous response functions are brought in connection with the large entropy persisting at $T<J$.

12 pages, REVTEX, 4 Postscript figures in a separate uufile

References in corpus (4)

• Correlated Electrons in High Temperature Superconductors
• Toward a Unified Magnetic Phase Diagram of the Cuprate Superconductors
• Quantum Critical Scaling in a Moderately Doped Antiferromagnet
• Anomalous Spin Dynamics in Doped Quantum Antiferromagnets

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