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Anomalous charge transfer in La2CuO4 near the Néel temperature: Evidence of the transition from spin liquid to two-sublattice antiferromagnetic state

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Abstract

The temperature dependence of the electrical resistance and thermopower of La2− x SrxCuO4+δ single crystals with x ≅ 0.003 and δ<0.05 has been studied in the temperature range from 100 to 400 K. All crystals exhibiting two-dimensional hopping conductivity via neighboring acceptor sites in the CuO2 plane show a significant difference in the charge transfer below and above the Néel temperature T N. This difference indicates that the loss of a two-sublattice antiferromagnetic order strongly affects the charge transport in the CuO2 plane. The obtained data lead to a conclusion that the crystal above T N occurs in a resonance valence bond state of the Bose type.

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Authors and Affiliations

  1. Russian Research Centre Kurchatov Institute, Moscow, 123182, Russia

    O. E. Parfenov & A. A. Nikonov

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  1. O. E. Parfenov
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  2. A. A. Nikonov
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__________

Translated from Pis’ma v Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Fiziki, Vol. 80, No. 4, 2004, pp. 284–288.

Original Russian Text Copyright © 2004 by Parfenov, Nikonov.

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Parfenov, O.E., Nikonov, A.A. Anomalous charge transfer in La2CuO4 near the Néel temperature: Evidence of the transition from spin liquid to two-sublattice antiferromagnetic state. Jetp Lett. 80, 253–257 (2004). https://doi.org/10.1134/1.1813681

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