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Particle-hole symmetry in the antiferromagnetic state of the cuprates | | Yayu Wang
; N. P. Ong
; | | Date: |
10 Oct 2001 | | Journal: | Proc. Nat. Acad. Sci. 98, 11091-11096 (2001) | | Subject: | Strongly Correlated Electrons; Superconductivity | cond-mat.str-el cond-mat.supr-con | | 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 $
m 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 ($xsimeq 0.01$). We discuss implications for electronic properties both within the AF state and outside. | | Source: | arXiv, cond-mat/0110215 | | Other source: | [GID 897544] pnas | | Services: | Forum | Review | PDF | Favorites | |
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