Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2001-10-10
Proc. Nat. Acad. Sci. 98, 11091-11096 (2001)
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 7 figures
Scientific paper
10.1073/pnas.201228498
In the layered cuprate perovskites, the occurence of high-temperature superconductivity seems deeply related to the unusual nature of the hole excitations. The limiting case of a very small number of holes diffusing in the antiferromagnetic (AF) background may provide important insights into this problem. We have investigated the transport properties in a series of crystals of $\rm YBa_2Cu_3O_y$, and found that the temperature dependences of the Hall coefficient $R_H$ and thermopower $S$ change abruptly as soon as the AF phase boundary is crossed. In the AF state at low temperatures $T$, both $R_H$ and $S$ are unexpectedly suppressed to nearly zero over a broad interval of $T$. We argue that this suppression arises from near-exact symmetry in the particle-hole currents. From the trends in $R_H$ and $S$, we infer that the symmetry is increasingly robust as the hole density $x$ becomes very small ($x\simeq 0.01$). We discuss implications for electronic properties both within the AF state and outside.
Ong N. P.
Wang Yayu
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