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首页> 外文期刊>Japanese journal of applied physics >Universal Superconducting Ground State in Nd_(1.85)Ce_(0.15)CuO_4 and Nd_2Cu0_4
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Universal Superconducting Ground State in Nd_(1.85)Ce_(0.15)CuO_4 and Nd_2Cu0_4

机译：Nd_（1.85）Ce_（0.15）CuO_4和Nd_2Cu0_4中的通用超导基态

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摘要

Superconducting Nd_(1.85)Ce_(0.15)Cu0_4 (T_c~(zero) = 24K) and Nd_2Cu0_4 (r_c~(zero) = 25K) thin films have been grown by molecular beam epitaxy and their magneto-transport and structural properties have been investigated. The as-grown films are insulators irrespective of the substitution level, and superconductivity is induced after the samples are treated by an annealing process under reducing atmospheres. Though the metallic conductivity is higher in the Ce~(4+) substituted sample, the superconducting properties are quite similar between Ce4+ substituted and substitution-free samples. A similar upper critical magnetic field as well as a similar superconducting transition temperature of Nd_(1.85) Ce_(0.15)CuO_4 and Nd_2CuO_4 shows that the addition of electrons merely influences the superconducting state. Consequently, the appearance of an antiferromagnetic Mott insulating state solely depends on the annealing process, not on the electron doping or cerium substitution level.
机译：Nd_（1.85）Ce_（0.15）Cu0_4（T_c〜（zero）= 24K）和Nd_2Cu0_4（r_c〜（zero）= 25K）超导薄膜已经通过分子束外延生长并研究了其磁传输和结构性质。所生长的膜是绝缘体，与取代水平无关，并且在还原性气氛下通过退火工艺处理样品后，会诱发超导性。尽管在Ce〜（4+）取代样品中金属电导率较高，但是在Ce4 +取代样品和无取代样品之间的超导性能非常相似。 Nd_（1.85）Ce_（0.15）CuO_4和Nd_2CuO_4的相似的上临界磁场以及相似的超导转变温度表明，电子的添加仅影响超导状态。因此，反铁磁莫特绝缘态的出现仅取决于退火过程，而不取决于电子掺杂或铈取代水平。

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  • 来源
    《Japanese journal of applied physics》 |2012年第1issue1期|p.010106.1-010106.4|共4页
  • 作者

    Yoshiharu Krockenberger; Hideki Yamamoto; Masaya Mitsuhashi; Michio Naito;

  • 作者单位

    NTT Basic Research Laboratories, NTT Corporation, Atsugi, Kanagawa 243-0198, Japan;

    NTT Basic Research Laboratories, NTT Corporation, Atsugi, Kanagawa 243-0198, Japan;

    NTT Basic Research Laboratories, NTT Corporation, Atsugi, Kanagawa 243-0198, Japan;

    Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan;

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