NMR study on magnetic phase transition in electron-doped cuprate (La1−yYy)2−xCexCuO4 with T′-type structure
✍ Scribed by Takayuki Goto; Kaichiro Chiba; Masatsugu Fukunaga; Tetsuo Fukase
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 243 KB
- Volume
- 263
- Category
- Article
- ISSN
- 0921-4534
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✦ Synopsis
The magnetization of 4f-spins in the electron-doped high-T c cuprate with T'-type structure M2_xCexCuO 4 (M = Nd, Pr, Sm, Eu) has so far prevented NMR studies of the Cu 3d-spin and the conduction carrier. We have successfully synthesized the 4f-spin-free cuprate (Lal_yYy) 2 xCexCuO4 for Cu-NMR study. The observed sharp spectra of 63/65Cu without quadrupolar splittings similar to other conventional electron-doped cuprates like Nd2_xCexCuO 4 indicate that the doped carrier in this system is electron-like. With Ar-annealing treatment, though the electrical resistance showed a drastic reduction, the Cu-NMR Knight shift did not change appreciably, suggesting that the M-annealing treatment does not bring any change in the carrier concentration.