Effects of ionic size on the x=18 anomaly in La2−xBax−yMyCuO4 (M=Ca,Sr)

✍ Scribed by K. Yoshida; F. Nakamura; Y. Tanaka; Y. Maeno; T. Kagayama; G. Oomi; T. Fujita

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 149 KB
• Volume: 194-196
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(94)91525-3

✦ Synopsis

A structural transition at about 60 K occurs in La2_,,Ba~CuO 4 only around x = 1/8, accompanied by suppression of superconducting transition temperature T o. Partial substitution of smaller divalent ions for Ba 2÷ ions (Ba 2÷ > Sr 2÷ > Ca 2÷ ) leads to suppression of this low-temperature structural transition. The structural transition temperature is scaled quantitatively with the average size of divalent ions. Furthermore, this dependence corresponds well to chemical pressure effects.