The temperature dependences of the 63Cu nuclear spin-lattice relaxation rate 1 / T1 and Knight shift K in YBa2Cu4Os have been measured by nuclear quadrupole resonance (NQR) and nuclear magnetic resonance (NMR) techniques. In the normal state, both the 1/T~ for the Cu (2) sites and the in-plane compo
Carrier concentration dependences of the nuclear spin-lattice relaxation rate and the Knight shift in Y1−xCaxBa2Cu4O8
✍ Scribed by Takato Machi; Izumi Tomeno; Keishi Tai; Naoki Koshizuka; Hiroshi Yasuoka
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 627 KB
- Volume
- 226
- Category
- Article
- ISSN
- 0921-4534
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📜 SIMILAR VOLUMES
Spin-lattice relaxation rates for Cu-1 and Cu-2 are calculated in YBa,Cu,O,\_, for various stoichiometries. It is found that the Cu-1 relaxation rate has a maximum in the vicinity of 6 = 0.3 if disordering occurs in the Cu-0 chains.
We have investigated the dependence of the oxygen isotope effect on the hole density in the high-T~ cuprates Bi2Sr2CaCu2Os and YBa:Cu~Os. The hole density n was varied by partial replacement of Ca by Y (hole acceptor) in BizSr2CaCu2Os, and by partial replacement of Y by Ca (hole donor) in YBa2Cu4Os.
Antiferromagnetic nuclear magnetic resonance (AFNMR) of the Cu(2) site and the Cu-NQR of the Cu(1) site are investigated as a function of excess oxygen, y, in Pb2Sr2(Yl\_xCa,)CuaO~+ ~. We confirm the re-appearance of the antiferromagnetic order of the Cu(2) moments and The ~h~n~e of the valence of t