Effects of strong magnetic fields on pairing fluctuations in high-temperature superconductors
Effects of strong magnetic fields on pairing fluctuations in high-temperature superconductors
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DOI：
10.1103/physrevb.59.12095
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发表时间：
1999-05-01
影响因子：
3.7
通讯作者：
Sauls, JA
中科院分区：
文献类型：
--
作者：
Eschrig, M;Rainer, D;Sauls, JA
我们提出了超导配对涨落对高磁场中层状超导体的核自旋晶格弛豫率 1/T-1 和 NMR Knight 位移的影响的理论。这些结果可用于阐明高 T-c 铜酸盐中赝能隙的起源，该起源归因于自旋波动和配对波动。我们提出了 s 波和 d 波配对波动的理论结果，并表明最近在最佳掺杂 YBa2Cu3O7-delta 中的实验是通过 d 波配对波动来描述的 [V. F. Mitrovic 等人，物理学。莱特牧师。 82、2784（1999）； H.N.巴赫曼等人。 （未发表）]。此外，我们还表明，YBa2Cu3O7-δ 中的正交畸变解释了实验观察到的核四极共振和低场核磁共振获得的 1/T-1 之间的差异。我们提出了一种核磁共振实验来区分波动的 s 波阶次参数和波动的强各向异性阶次参数，该实验可应用于 Nd2-xCexCuO4-delta 系统以及可能的其他层状超导体。 [S0163-1829(99)02818-0]。
We present the theory for the effects of superconducting pairing fluctuations on the nuclear spin-lattice relaxation rate 1/T-1 and the NMR Knight shift for layered superconductors in high magnetic fields. These results can be used to clarify the origin of the pseudogap in high-T-c cuprates, which has been attributed to spin fluctuations as well as pairing fluctuations. We present theoretical results for s-wave and d-wave pairing fluctuations and show that recent experiments in optimally doped YBa2Cu3O7-delta are described by d-wave pairing fluctuations [V. F. Mitrovic et al., Phys. Rev. Lett. 82, 2784 (1999); H. N. Bachman et al. (unpublished)]. In addition, we show that the orthorhombic distortion in YBa2Cu3O7-delta accounts for an experimentally observed discrepancy between 1/T-1 obtained by nuclear quadrupole resonance and nuclear magnetic resonance at low field. We propose an NMR experiment to distinguish a fluctuating s-wave order parameter from a fluctuating strongly anisotropic order parameter, which may be applied to the system Nd2-xCexCuO4-delta and possibly other layered superconductors. [S0163-1829(99)02818-0].