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首页> 外文期刊>Physical review >Interplay of composition, structure, magnetism, and superconductivity in SmFeAs_(1-x)P_xO_(1-y)
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Interplay of composition, structure, magnetism, and superconductivity in SmFeAs_(1-x)P_xO_(1-y)

机译：SmFeAs_（1-x）P_xO_（1-y）中组成，结构，磁性和超导的相互作用

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摘要

Polycrystalline samples and single crystals of SmFeAs_(1_x)P_xO_(1-y), were synthesized and grown employing different synthesis methods and annealing conditions. Depending on the phosphorus and oxygen content, the samples are either magnetic or superconducting. In the fully oxygenated compounds, the main impacts of phosphorus substitution are to suppress the Neel temperature T_n of the spin density wave (SDW) state and to strongly reduce the local magnetic field in the SDW state, as deduced from muon spin rotation measurements. On the other hand, the superconducting state is observed in the oxygen-deficient samples only after heat treatment under high pressure. Oxygen deficiency as a result of synthesis at high pressure brings the Sm-0 layer closer to the superconducting As/P-Fe-As/P block and provides additional electron transfer. Interestingly, the structural modifications in response to this variation of the electron count are significantly different when phosphorus is partly substituting arsenic. Point contact spectra are well described with two superconducting gaps. Magnetic and resistance measurements on single crystals indicate an in-plane magnetic penetration depth of ～200 nm and an anisotropy of the upper critical field slope of ~4-5.
机译：合成了SmFeAs_（1_x）P_xO_（1-y）的多晶样品和单晶，并采用不同的合成方法和退火条件对其进行了生长。根据磷和氧的含量，样品是磁性的或超导的。在完全氧化的化合物中，磷取代的主要影响是抑制自旋密度波（SDW）状态的Neel温度T_n，并强烈减小SDW状态下的局部磁场，这是通过μon自旋旋转测量得出的。另一方面，仅在高压下热处理后，在缺氧样品中才观察到超导状态。高压合成引起的缺氧使Sm-0层更接近超导As / P-Fe-As / P嵌段，并提供了额外的电子转移。有趣的是，当磷部分取代砷时，响应于电子数变化的结构修饰显着不同。点接触光谱用两个超导间隙很好地描述了。对单晶的磁和电阻测量表明，面内磁穿透深度约为200 nm，上临界场斜率的各向异性约为4-5。

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  • 来源
    《Physical review》 |2011年第13期|p.134526.1-134526.14|共14页
  • 作者

    N. D. Zhigadlo; S. Katrych; M. Bendele; P. J. W. Moll; M. Tortello; S. Weyeneth; V. Yu. Pomjakushin; J. Kanter; R. Puzniak; Z. Bukowski; H. Keller; R. S. Gonnelli; R. Khasanov; J. Karpinski; B. Batlogg;

  • 作者单位

    Laboratory for Solid State Physics, ETH Zurich, CH-8093 Zurich, Switzerland;

    Laboratory for Solid State Physics, ETH Zurich, CH-8093 Zurich, Switzerland;

    Physik-Institut der Universitaet Zuerich, Winterthurerstrasse 190, CH-8057 Zuerich, Switzerland,Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland;

    Laboratory for Solid State Physics, ETH Zurich, CH-8093 Zurich, Switzerland;

    Dipartimento di Fisica, Politecnico di Torino, 10129 Torino, Italy;

    Physik-Institut der Universitaet Zuerich, Winterthurerstrasse 190, CH-8057 Zuerich, Switzerland;

    Laboratory for Neutron Scattering, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland;

    Laboratory for Solid State Physics, ETH Zurich, CH-8093 Zurich, Switzerland;

    Institute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32146, PL-02-668 Warsaw, Poland;

    Laboratory for Solid State Physics, ETH Zurich, CH-8093 Zurich, Switzerland;

    Physik-Institut der Universitaet Zuerich, Winterthurerstrasse 190, CH-8057 Zuerich, Switzerland;

    Dipartimento di Fisica, Politecnico di Torino, 10129 Torino, Italy;

    Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland;

    Laboratory for Solid State Physics, ETH Zurich, CH-8093 Zurich, Switzerland;

    Laboratory for Solid State Physics, ETH Zurich, CH-8093 Zurich, Switzerland;

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  • 关键词

    effects of material synthesis, crystal structure, and chemicalrncomposition; properties of type Ⅰand type Ⅱsuperconductors; methods of materials synthesis and materials processing;

    机译：材料合成;晶体结构和化学成分的影响;Ⅰ型和Ⅱ型超导体的性能;材料合成与材料加工方法;

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