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首页> 外文期刊>Physical review >Heavy electron doping induced antiferromagnetic phase as the parent for the iron oxypnictide superconductor LaFeAsO_(1-x)H_x
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Heavy electron doping induced antiferromagnetic phase as the parent for the iron oxypnictide superconductor LaFeAsO_(1-x)H_x

机译：重电子掺杂诱导反铁磁相作为氧氧化铁超导体LaFeAsO_（1-x）H_x的母体

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摘要

We perform transport measurements and band structure calculations of electron-doped LaFeAsO_(1-x)H_x over a wide range of x from 0.01 to 0.66. The T~2 and √T dependency of the resistivity are observed at x ～ 0.17 and 0.41, respectively. The sign change of R_H without opening of the spin-density-wave gap for 0.45 ≤ x ≤ 0.58 and T ＜ T_N as well as the calculated non-nested Fermi surface at x = 0.5 indicate the more localized nature of the AF2 as compared to spin-density-wave phase at the nondoped sample. Considering the results from band calculations and the finite size of Hund's rule coupling, the change of the normal conducting state with x is reasonably explained by a strong depression of the coherent scale owing to the increased effective Coulomb repulsion in the narrow antibonding 3d_(xy) band that approaches the half-filled regime. The following transition from the paramagnet to AF2 is understood as the quenching or ordering of the less-screened spins with a large entropy at low temperature. These results suggest that the normal conducting properties over a wide doping range for the LaFeAsO_(1-x)H_x are strongly influenced by the local spins in the incoherent region. Thus, we conclude that the parent phase in LaFeAsO_(1-x)H_x is not the spin-density wave but the AF2, which may be primarily responsible for the singular superconducting properties of the 1111 type compared with other iron pnictides.
机译：我们在0.01到0.66的x范围内进行电子掺杂LaFeAsO_（1-x）H_x的传输测量和能带结构计算。电阻率的T〜2和√T依赖性分别在x〜0.17和0.41处观察到。在0.45≤x≤0.58和T ＜T_N且未打开自旋密度波隙的情况下，R_H的符号变化以及在x = 0.5时计算出的非嵌套费米面，表明AF2与非掺杂样品的自旋密度波相位。考虑到带计算的结果和Hund规则耦合的有限大小，由于窄反键3d_（xy）中有效库仑斥力的增加，相干尺度的强烈降低可以合理地解释正常导电态随x的变化。接近半满制的乐队。从顺磁体到AF2的以下过渡被理解为是在低温下具有较大熵的，受较少筛选的自旋的猝灭或有序化。这些结果表明，LaFeAsO_（1-x）H_x在较宽的掺杂范围内的正常导电性能受非相干区局部自旋的强烈影响。因此，我们得出的结论是，LaFeAsO_（1-x）H_x中的母相不是自旋密度波，而是AF2，与其他铁肽相比，AF2可能是1111型奇异超导性质的主要起因。

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  • 来源
    《Physical review》 |2016年第2期|024512.1-024512.10|共10页
  • 作者

    Soshi Iimura; Satoru Matsuishi; Hideo Hosono;

  • 作者单位

    Laboratory for Materials and Structures, Tokyo Institute of Technology, Yokohama 226-8503, Japan;

    Materials Research Center for Element Strategy, Tokyo Institute of Technology, Yokohama 226-8503, Japan;

    Laboratory for Materials and Structures, Tokyo Institute of Technology, Yokohama 226-8503, Japan,Materials Research Center for Element Strategy, Tokyo Institute of Technology, Yokohama 226-8503, Japan;

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