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28 March 2024
 
  » arxiv » cond-mat/0305455

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Anomalous high-temperature Hall effect on the triangular lattice in Na_xCoO_2
Yayu Wang ; Nyrissa S. Rogado ; R. J. Cava ; N. P. Ong ;
Date 20 May 2003
Subject Superconductivity; Strongly Correlated Electrons | cond-mat.supr-con cond-mat.str-el
AbstractThe Hall coefficient R_H of Na_xCoO_2 (x = 0.68) behaves anomalously at high temperatures. From 200 to 500 K, R_H increases linearly with T to 8 times the expected Drude value, with no sign of saturation. Together with the thermopower Q, the behavior of R_H provides firm evidence for strong correlation. We discuss the effect of hopping on a triangular lattice and compare R_H with a recent prediction by Kumar and Shastry.
Source arXiv, cond-mat/0305455
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