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首页> 外文期刊>Physical review >D-wave superconductivity and its coexistence with antiferromagnetism in the t-J-U model: Statistically consistent Gutzwiller approach
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D-wave superconductivity and its coexistence with antiferromagnetism in the t-J-U model: Statistically consistent Gutzwiller approach

机译：t-J-U模型中的D波超导及其与反铁磁性的共存：统计上一致的Gutzwiller方法

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摘要

We discuss the coexistence of antiferromagnetism and d-wave superconductivity within the so-called statistically consistent Gutzwiller approximation (SGA) applied to the t-J-U model. In this approach, the averages calculated in a self-consistent manner coincide with those determined variationally. Such consistency is not guaranteed within the standard renormalized mean-field theory. With the help of SGA, we show that for the typical value J/∣t∣ ＝ 1/3, coexistence of antiferromagnetism (AF) and superconductivity (SC) appears only for U/∣t∣ ＞ 10.6 and in a very narrow range of doping (δ(＜) 0.006) in the vicinity of the Mott insulating state, in contrast to some previous reports. In the coexistent AF ＋ SC phase, a staggered spin-triplet component of the superconducting gap appears also naturally; its value is very small.
机译：我们讨论在应用于t-J-U模型的所谓统计上一致的Gutzwiller逼近（SGA）中反铁磁和d波超导的共存。在这种方法中，以自洽方式计算的平均值与通过变化确定的平均值一致。在标准的重新归一化均场理论中不能保证这种一致性。借助SGA，我们证明对于典型值J / ∣t∣ ＝ 1/3，仅当U / ∣t∣＞ 10.6且在非常窄的范围内出现反铁磁（AF）和超导（SC）并存与以前的一些报道相反，在莫特绝缘态附近掺杂（δ（＜0.006））。在共存的AF ＋ SC阶段，超导间隙的交错的自旋三重态分量也自然出现。它的价值很小。

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  • 来源
    《Physical review》 |2013年第9期|094502.1-094502.10|共10页
  • 作者

    M. Abram; J. Kaczmarczyk; J. JEdrak; J. Spalek;

  • 作者单位

    Marian Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4,30-059 Krakow, Poland;

    Marian Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4,30-059 Krakow, Poland;

    Faculty of Non-Ferrous Metals, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Krakow, Poland;

    Marian Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4,30-059 Krakow, Poland,Academic Centre for Materials and Nanotechnology, Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Reymonta 19, 30-059 Krakow, Poland;

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  • 正文语种 eng
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  • 关键词

    strongly correlated electron systems; heavy fermions; superconductivity phase diagrams;

    机译：强相关电子系统;重费米子超导相图;

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