Particle-hole symmetry in the antiferromagnetic state of the cuprates

Abstract

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 $\mathrm{YB}{\mathrm{a}}_2\mathrm{C}{\mathrm{u}}_3{\mathrm{O}}_{\mathrm{y}}$, 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.

8 pages, 7 figures

References in corpus (2)

• Mobility of the Doped Holes and the Antiferromagnetic Correlations in Underdoped High-T_c Cuprates
• Antiferromagnetic ordering in superconducting $\mathbf{YB}{\mathbf{a}}_2\mathbf{C}{\mathbf{u}}_3{\mathbf{O}}_{6.5}$

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