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首页> 外文期刊>Physica, C. Superconductivity and its applications >NMR RELAXATION RATES IN SUPERCONDUCTORS WITH (IN)COMMENSURATE MAGNETIC ORDER - A MODEL INSPIRED BY HIGH-T-C SUPERCONDUCTORS
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NMR RELAXATION RATES IN SUPERCONDUCTORS WITH (IN)COMMENSURATE MAGNETIC ORDER - A MODEL INSPIRED BY HIGH-T-C SUPERCONDUCTORS

机译：具有（不）对称磁阶的超导体中的NMR弛豫速率-一种由高T-C超导体激发的模型

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摘要

We propose a model for s wave superconductors (the antiferromagnetic superconductor (AFS) model) in the presence of nonuniform (in)commensurate magnetic order and analyse the NMR properties of this model. It is found that the superconducting quasiparticle spectrum has nodes in the gap when the exchange energy h is larger than the superconducting order parameter Delta. This leads to a power-law dependence of various quantities on temperature and frequency. By using the RPA susceptibility chi(ij)(k,omega) the longitudinal and transverse NMR relaxation rates 1/T-1 and 1/T-2, as well as the Knight shift K(T) are calculated in the AFS model. As an example we study an HTS-like system with a t-t' quasiparticle spectrum. The results obtained are compared with experimental results on YBa2Cu3O6+x. A reasonable fit for K(T) is obtained for the ratio 2 Delta/T-c = 6-8 and h approximate to (0.1-0.2)t. At low T one has 1/T-1 similar to T-3 for both O-17 and Cu-63, while (1) the coherence Hebel-Slichter peak is absent, (2) the slope at T-c fits rather well by the quasiparticle damping rate Gamma = 0.8T(c)(T/T-c)(3). The temperature dependence of the rate 1/T-2 is similar to case of the d wave pairing. The proposed AFS theory is general and it is applicable to systems where the coexistence of (in)commensurate magnetic order and superconductivity takes place: magnetic superconductors, heavy-fermion superconductors, and rare-earth nickel boride-carbides RNi(2)B(2)C. [References: 47]
机译：我们提出了在存在不均匀（相称）磁阶的情况下用于s波超导体的模型（反铁磁超导体（AFS）模型），并分析了该模型的NMR特性。发现当交换能量h大于超导阶数参数Delta时，超导准粒子谱在间隙中具有节点。这导致各种量的幂律对温度和频率的依赖性。通过使用RPA磁化率chi（ij）（k，ω），在AFS模型中计算了纵向和横向NMR弛豫率1 / T-1和1 / T-2以及奈特位移K（T）。作为示例，我们研究了具有t-t'准粒子光谱的类HTS系统。将获得的结果与YBa2Cu3O6 + x上的实验结果进行比较。对于比率2 Delta / T-c = 6-8且h近似于（0.1-0.2）t，可以获得K（T）的合理拟合。在低T处，O-17和Cu-63的T / 1 / T-1都与T-3相似，而（1）不存在相干Hebel-Slichter峰，（2）Tc处的斜率非常适合准粒子阻尼率Gamma = 0.8T（c）（T / Tc）（3）。比率1 / T-2的温度依赖性与d波对的情况类似。所提出的AFS理论是通用的，适用于发生（以）相称的磁序和超导共存的系统：磁超导体，重-铁超导体和稀土硼化硬质合金RNi（2）B（2） ）C。 [参考：47]

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