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

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.

arXiv comment17 pages, 5 figures, International Symposium on Superconductivity 2007

References in corpus (4)

• New class of T-prime-structure cuprate superconductors
• Kondo effect in underdoped n-type superconductors
• Phase control of La2CuO4 in thin-film synthesis
• Role of impurity oxygen in superconductivity of "non-doped" T'-(La,RE)2CuO4

Cited by in corpus (11)

• Apical oxygens and correlation strength in electron and hole doped copper oxides
• Direct theoretical evidence for weaker correlations in electron-doped and Hg-based hole-doped cuprates
• Generic phase diagram of "electron-doped" T' cuprates
• Superconductivity in undoped T' cuprates with Tc over 30 K
• New superconduting cuprates with no effective doping: T'-(La3+)2-x(RE3+)xCuO4
• Reduction dependence of superconductivity in undoped T' cuprates
• Optical study of superconducting Pr${}_2$CuO${}_x$ with $x\simeq 4$
• Transport anomalies and quantum criticality in electron-doped cuprate superconductors
• Tunable superconductivity in parent cuprate Pr${}_2$CuO${}_{4\pm \delta }$ thin films
• Normal State Gap in Parent Cuprate Pr2CuO4+/-δ
• Eliashberg analysis of the optical conductivity in superconducting Pr${}_2$CuO${}_x$ ($x\simeq 4$)