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首页> 美国卫生研究院文献>Proceedings of the National Academy of Sciences of the United States of America >Quantum spin correlations through the superconducting-to-normal phase transition in electron-doped superconducting Pr0.88LaCe0.12CuO4-δ
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Quantum spin correlations through the superconducting-to-normal phase transition in electron-doped superconducting Pr0.88LaCe0.12CuO4-δ

机译：电子掺杂的超导Pr0.88LaCe0.12CuO4-δ中超导至正态相变的量子自旋相关性

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摘要

The quantum spin fluctuations of the S = 1/2 Cu ions are important in determining the physical properties of high-transition-temperature (high Tc) copper oxide superconductors, but their possible role in the electron pairing of 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-δ (Tc = 24 K), is accompanied by the complete suppression of the resonance and the concomitant emergence of static antiferromagnetic 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.
机译：S = 1/2 Cu离子的量子自旋涨落对于确定高转变温度（高Tc）氧化铜超导体的物理性质很重要，但是它们在超导电子配对中的可能作用仍然是一个悬而未决的问题。最佳掺杂的高Tc超导体中自旋涨落的主要特征是定义明确的磁共振，其能量（ER）跟踪Tc（随着成分的变化），其强度像超导状态下的阶次参数一样发展。我们表明，在电子掺杂的高Tc超导体Pr0.88LaCe0.12CuO4-δ（Tc = 24 K）中，磁场对超导性及其相关的凝结能量的抑制伴随着对共振的完全抑制和磁化。随之出现静态反铁磁序。我们的结果表明，共振与超导缩合能密切相关，因此表明它在电子配对和超导中起作用。

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