Physics – Condensed Matter – Superconductivity
Scientific paper
2007-08-17
Physics
Condensed Matter
Superconductivity
PDF Format: 35 pages, 4 main text figures, 6 supplemental figures; Accepted for publication in PNAS
Scientific paper
10.1073/pnas.0704822104
The quantum spin fluctuations of the S = 1/2 Cu ions are important in determining the physical properties of the high-transition temperature (high-Tc) copper oxide superconductors, but their possible role in the electron pairing for superconductivity remains an open question. The principal feature of the spin fluctuations in optimally doped high-Tc superconductors is a well defined magnetic resonance whose energy (Er) tracks Tc (as the composition is varied) and whose intensity develops like an order parameter in the superconducting state. We show that the suppression of superconductivity and its associated condensation energy by a magnetic field in the electron-doped high-Tc superconductor, Pr0.88LaCe0.12CuO4-d (Tc = 24 K), is accompanied by the complete suppression of the resonance and the concomitant emergence of static antiferromagnetic (AF) order. Our results demonstrate that the resonance is intimately related to the superconducting condensation energy, and thus suggest that it plays a role in the electron pairing and superconductivity.
Dai Pengcheng
Freeman Paul G.
Habicht Klaus
Li Shiliang
Lynn Jeffrey W.
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