Thermoelectric power measurements on Tl sub 2. 2 Ba sub 2 (Ca sub 2 minus x Y sub x )Cu sub 3 O sub Y

Journal Article · Sat Dec 01 04:00:00 EST 1990 · Applied Physics Communications; (United States)

OSTI ID:5387497

Wang, J H; Dong, C; Hermann, A M ^[1]; Weeks, D; Fei, X ^[2]; Kiehl, W ^[3]; Trefny, J ^[4]; Zhao, Z ^[5]

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1. Univ. of Colorado, Boulder (United States)
2. Univ. of Arkansas, Fayetteville (United States)
3. Univ. of Colorado, Boulder (United States) Univ. of Arkansas, Fayetteville (United States)
4. Colorado School of Mines, Golden (United States)
5. Inst. of Physics, Beijing (China)

Thermoelectric power, resistivity, ac susceptibility and structural properties of bulk samples with an initial composition of Tl{sub 2.2}Ba{sub 2}(Ca{sub 2{minus}x}Y{sub x})Cu{sub 3}O{sub y} are studied for the range 0.0 {le} x {le} 2.0. The Tl-based 2,223, 2,212 and 1,212 (Tl, Ba, Ca, Cu) crystal structures are identified in the multiphased samples. For x {le} 0.1 the 2,223 phase is predominant while for 0.5 {le} x {le} 2 the 1,212 phase predominates. As x is increased the critical temperature is observed to decrease and the thermoelectric power to increase. From the thermoelectric power measurements, it is determined that the Tl{sub 2.2}Ba{sub 2}(Ca{sub 2{minus}x}Y{sub x})Cu{sub 3}O{sub y} samples are p-type for all values of x studied. The thermoelectric power demonstrates a clear transition to superconductivity for x {le} 0.1, uncorrelated Fermi liquid behavior for 0.5 {le} x {le} 1.8 above 80K, and semiconductive behavior for x = 2 at all temperatures studied.

• OSTI ID: 5387497
• Journal Information: Applied Physics Communications; (United States), Journal Name: Applied Physics Communications; (United States) Vol. 10:4; ISSN 0277-9374; ISSN APCOD
• Country of Publication: United States
• Language: English

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ELECTRIC CONDUCTIVITY
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OXIDES
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THERMODYNAMIC PROPERTIES
THERMOELECTRIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
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YTTRIUM COMPOUNDS
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