Clear distinction between the underdoped and overdoped regime in the {ital T}{sub {ital c}} suppression of Cu-site-substituted high-{ital T}{sub {ital c}} cuprates
- Department of Applied Physics, Faculty of Engineering, Tohoku University, Aramaki Aoba, Aoba-ku, Sendai 980 (Japan)
The {ital T}{sub {ital c}} suppression by Cu-site substitution has been studied in a wide range of carrier concentrations {ital p}, from the underdoped regime to the overdoped regime, using sintered polycrystals of Bi{sub 2}Sr{sub 2}Ca{sub 1{minus}{ital x}}Y{sub {ital x}}(Cu{sub 1{minus}{ital z}}{ital M}{sub {ital z}}){sub 2}O{sub 8+{delta}} with {ital x}=0 and {ital x}=0.3 and under variation of {delta}. The carrier-dependent strength of the {ital T}{sub {ital c}} suppression by substituting {ital M}=Fe, Co, Ni, Zn for Cu is measured. In the overdoped regime, we find {ital T}{sub {ital c}} scaling as {ital T}{sub {ital c}}({ital p},{ital z})/{ital T}{sub {ital c}}({ital p},0)={ital g}({ital z}) with a {ital p}-independent function {ital g}({ital z}), whereas in the underdoped regime {ital T}{sub {ital c}}({ital p},{ital z})/{ital T}{sub {ital c}}({ital p},0) is strongly {ital p} dependent. Replotting data of various publications on the La{sub 2{minus}{ital x}}Sr{sub {ital x}}CuO{sub 4} system and comparison with the YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} system demonstrate the universality of this distinction between the two regimes in {ital p}-type high-{ital T}{sub {ital c}} cuprates. The scaling behavior is discussed with respect to Born-limit and unitarity-limit scattering.
- OSTI ID:
- 76437
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 52, Issue 2; Other Information: PBD: 1 Jul 1995
- Country of Publication:
- United States
- Language:
- English
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