MBE growth and properties of T′-La2CuO4 thin films

✍ Scribed by H. Yamamoto; O. Matsumoto; A. Tsukada; M. Naito

• Book ID: 104084589
• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 461 KB
• Volume: 470
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2010.05.026

✦ Synopsis

Parent-compound superconductors Nd 2 CuO 4 (T 0 ) structure MBE Phase control a b s t r a c t

We prepared thin films of T 0 -La 2 CuO 4 , which usually crystallizes in the T structure, by MBE, and investigated their properties while systematically changing the post-reduction conditions with a view towards obtaining superconductivity along the lines of the parent compound superconductors we have recently reported (O. Matsumoto et al., Phys. Rev. B 79 (2009) 100508(R)). The results indicate that the optimal reduction window is very narrow, near which metallic conductivity is obtained down to 50 K. The resistivity of the T 0 -La 2 CuO 4 films is in the range of 10 À2 -10 À3 X cm, which is several orders of magnitude lower than that of the counterpart T-La 2 CuO 4 , the implication of which is briefly discussed from the viewpoint of the difference in electronic structure induced by different oxygen coordination.