Superconductivity in undoped T'-RE2CuO4 with Tc over 30 K

O. Matsumoto; A. Utsuki; A. Tsukada; H. Yamamoto; T. Manabe; M. Naito

doi:10.1016/j.physc.2008.05.019

Superconductivity in undoped T'-RE2CuO4 with Tc over 30 K

Superconductivity 2009-11-13 v1

Authors: O. Matsumoto , A. Utsuki , A. Tsukada , H. Yamamoto , T. Manabe , M. Naito

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Abstract

In this article, we report the superconductivity in T'-RE2CuO4 (RE = Pr, Nd, Sm, Eu, and Gd), which have been for a long time believed as a Mott insulator. Our discovery was achieved by using metal-organic decomposition (MOD), an inexpensive and easy-to-implement thin-film process. The keys to prepare the superconducting films are firing with low partial-pressure of oxygen and reduction at low temperatures. The highest Tc of undoped T'-RE2CuO4 is over 30 K, substantially higher than "electron-doped" analogs. Remarkably, Gd2CuO4, even the derivatives of which have not shown superconductivity so far, gets superconducting with Tconset as high as 20 K. The implication of our discovery is briefly discussed.

Keywords

superconductivity T'-RE2CuO4 undoped cuprates Mott insulator metal-organic decomposition thin films critical temperature

Cite

@article{arxiv.0801.4469,
  title  = {Superconductivity in undoped T'-RE2CuO4 with Tc over 30 K},
  author = {O. Matsumoto and A. Utsuki and A. Tsukada and H. Yamamoto and T. Manabe and M. Naito},
  journal= {arXiv preprint arXiv:0801.4469},
  year   = {2009}
}

Comments

17 pages, 5 figures, International Symposium on Superconductivity 2007

Superconductivity in undoped T'-RE2CuO4 with Tc over 30 K

Abstract

Keywords

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