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arXiv 0705.1472cond-mat.supr-concond-mat.str-el
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四层结构Ba2Ca3Cu4O8F2中电子掺杂层的反铁磁性和高温超导性的均匀混合:电子欠掺杂RegimePhenomenon中的一种新现象

Uniform Mixing of Antiferromagnetism and High-Tc Superconductivity in Electron-doped Layers in Four-layered Ba2Ca3Cu4O8F2 : A New Phenomenon in an Electron Underdoped RegimePhenomenon in an Electron Underdoped Regime

S. Shimizu, H. Mukuda, Y. Kitaoka, A. Iyo, Y. Tanaka, Y. Kodama, K. Tokiwa, T. Watanabe

摘要:

本文报道了四层含氟(F-1)的高温超导体Ba_2Ca_3Cu_4O_8F_2(0234 F(2.0))的Cu-和F-NMR研究。我们发现,该化合物具有反铁磁性(AFM)与尼尔温度TN=100 K,尽管是一个Tc= 55 K-超导体。通过与相关的三层铜酸盐Ba_2Ca_2Cu_3O_6F_2(0223 F(2.0))的比较,证明了在0234 F(2.0)和0223 F(2.0)中电子从内平面(IP)转移到外平面(OP),证实了在单一化合物中具有电子和空穴掺杂的自掺杂高温超导性(HTSC)。值得注意的是,AFM和HTSC的均匀混合发生在0234 F(2.0)中的电子掺杂OP和空穴掺杂IP两者中。

英文摘要:

We report Cu- and F-NMR studies on a four-layered high-temperature superconductor Ba2Ca3Cu4O8F2(0234F(2.0)) with apical fluorine (F-1), an undoped 55 K-superconductor with a nominal Cu2+ valence on average. We reveal that this compound exhibits the antiferromagnetism (AFM) with a Neel temperature TN=100 K despite being a Tc= 55 K-superconductor. Through a comparison with a related tri-layered cuprate Ba2Ca2Cu3O6F2 (0223F(2.0)), it is demonstrated that electrons are transferred from the inner plane (IP) to the outer plane (OP) in 0234F(2.0) and 0223F(2.0), confirming the self-doped high-temperature superconductivity (HTSC) having electron and hole doping in a single compound. Remarlably, uniform mixing of AFM and HTSC takes place in both the electron-doped OPs and the hole-doped IPs in 0234F(2.0).

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