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Charge-density wave and superconductor competition in stripe phases of high-temperature superconductors

机译：高温超导体条纹相中的电荷密度波和超导体竞争

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摘要

We discuss the problem of competition between a superconducting (SC) ordered state and a charge-density wave (CDW) state in stripe phases of high T_c superconductors. We consider an effective model for each stripe motivated by studies of spin-gapped electronic ladder systems. We analyze the problem of dimensional crossover arising from interstripe SC and CDW couplings using non-Abelian bosonization and renormalization group (RG) arguments to derive an effective O (4) -symmetric nonlinear δ model in D=2+1 for the case when both interstripe couplings are of equal magnitude as well as equally RG relevant. By studying the effects of various symmetry lowering perturbations, we determine the structure of the phase diagram and show that, in general, it has a broad regime in which both orders coexist. The quantum and thermal critical behavior is discussed in detail, and the phase coexistence region is found to end at associated T=0 as well as T>0 tetracritical points. The possible role of hedgehog topological excitations of the theory is considered and argued to be RG irrelevant at the spatially anisotropic higher dimensional low-energy fixed point theory. Our results are also relevant to the case of competing Neel and valence bond solid orders in quantum magnets on two-dimensional isotropic square as well as rectangular lattices interacting via nearest-neighbor Heisenberg exchange interactions.
机译：我们讨论了高T_c超导体的条纹相中超导（SC）有序态与电荷密度波（CDW）态之间的竞争问题。我们通过研究自旋间隙电子梯形系统为每个条带考虑一个有效的模型。我们分析了使用非阿贝尔玻色化和重归一化组（RG）参数的条带化SC和CDW耦合引起的尺寸交叉问题，对于两种情况下D = 2 + 1的情况，得出了有效的O（4）对称非线性δ模型条纹耦合的大小相等，RG相关性也相同。通过研究各种对称性降低扰动的影响，我们确定了相图的结构，并表明，一般而言，它具有两个阶次共存的宽泛范围。详细讨论了量子和热临界行为，发现相共存区域在关联的T = 0以及T> 0四临界点处终止。该理论的刺猬拓扑激发的可能作用被认为并认为与空间各向异性高维低能量不动点理论无关。我们的结果也与二维各向同性正方形量子磁体中的Neel和价键固体顺序竞争以及通过最近邻海森堡交换相互作用相互作用的矩形晶格有关。

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  • 来源
    《Physical review》 |2010年第14期|p.144531.1-144531.8|共8页
  • 作者

    Akbar Jaefari; Siddhartha Lal; Eduardo Fradkin;

  • 作者单位

    Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801-3080, USA;

    Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801-3080, USA, IISER-Kolkata, Mohanpur campus, West Bengal741252, India;

    Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801-3080, USA;

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  • 正文语种 eng
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  • 关键词

    inhomogeneous superconductors and superconducting systems; transition temperature variations;

    机译：不均匀的超导体和超导系统;转变温度变化;

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