Superconductivity in undoped T' cuprates with Tc over 30 K
| Autor: | Matsumoto, Osamu, Utsuki, Aya, Tsukada, Akio, Yamamoto, Hideki, Manabe, Takaaki, Naito, Michio |
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| Rok vydání: | 2008 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.79.100508 |
| Popis: | Undoped cuprates have long been considered to be antiferromagnetic insulators. In this article, however, we report that superconductivity is achieved in undoped T'-RE2CuO4 (RE = Pr, Nd, Sm, Eu, and Gd). Our discovery was performed 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. Comment: 22 pages, 5 figures, submitted to Physical Review Letters |
| Databáze: | arXiv |
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