Low-energy spin fluctuations in YBa2Cu3O6.1 and ErBa2Cu3O6+x A Cu (1) T1 NQR study

✍ Scribed by S.G. Jang; C. Bucci; R. De Renzi; G. Guidi; M. Varotto; C. Segre; P. Radaelli

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 722 KB
• Volume: 226
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(94)90209-7

✦ Synopsis

63Cu( 1 ) NQR signals and their relaxation have been measured in YBa2Cu306.1 and ErBa2CuaO6+x at temperatures between 10 K and 300 K. In YBa2Cu306.1 a peak is observed in the spin-lattice relaxation, T/-~, around 140 K. An explanation in terms of doped-hole motion is presented and alternative O (4)-O (5) diffusion mechanisms are critically discussed. In ErBa2Cu306+x the low-temperature T i-1 is dominated by magnetic fluctuations of Er; quantitative agreement is found when the correct ground state and magnetic dynamic properties of the rare earth are taken into account.