1eand 2esuperconductivity in spin liquids and spin crystals
- 1 June 1987
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 35 (16), 8720-8722
- https://doi.org/10.1103/physrevb.35.8720
Abstract
The recent, unexpected discoveries of superconductors with reported transition temperatures as high as 123 K have renewed the search for mechanisms with higher transition temperatures. Among the resulting proposals is one by Anderson in which an odd-electron insulator in a resonating valence-bond or quantum-spin-liquid state becomes superconducting via pair condensation when sufficiently doped. However, Kivelson, Rokhsar, and Sethra have suggested that doping such a state introduces singly charged boson defects which form a superconducting state via Bose-Einstein condensation. We resolve this apparent contradiction by pointing out the possible existence of a remarkable transition between superconductivity with an elementary charge of the supercurrent of e to superconductivity with an elementary charge of 2e with increased doping. Moreover, both kinds of superconductivity occur, even in the spin-crystal or Néel state.Keywords
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