Tl-NMR study on high-{Tc} oxides TlM{sub 2}CaCu{sub 2}O{sub 7{minus}{delta}} (M=Ba, Sr): Spin-gap in underdoped and overdoped systems
Journal Article
·
· Journal of Low Temperature Physics
The Spin-lattice relaxation rate T{sub 1}{sup {minus}1} and the Knight shift have been measured for Tl-based cuprates TlBa{sub 2}CaCu{sub 2}O{sub 7+{delta}} (TB1212) and TlSr{sub 2} Y{sub 1{minus}x}Ca{sub x}Cu{sub 2}O{sub 7+{delta}} (TS1212). In the underdoped sample of TS1212 with {Tc} = 34K. (T{sub 1}T){sup {minus}1} showed a gap-like behavior from the temperature T{sub sg} = 120K. As for the slightly overdoped sample of TB1212 with {Tc} = 80K. both the Knight shift and (T{sub 1}T){sup {minus}1} showed a significant decrease from 160K. suggesting the existing of the spin-gap not only around q{approx{underscore}equal}({pi},{pi}), but also q{approx{underscore}equal}0.
- Research Organization:
- Sophia Univ., Tokyo (JP)
- OSTI ID:
- 20012834
- Journal Information:
- Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 3-4 Vol. 117; ISSN 0022-2291; ISSN JLTPAC
- Country of Publication:
- United States
- Language:
- English
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