Extraordinary behaviour of the Y[sub 1[minus]x]Pr[sub x]Ba[sub 2]Cu[sub 3]O[sub 7[minus][delta]] system

Conference · Tue Feb 01 04:00:00 EST 1994 · Journal of Superconductivity; (United States)

OSTI ID:7071524

Maple, M B ^[1]; Almasan, C C; Seaman, C L; Han, S H; Buchgeister, M; Gajewski, D A ^[2]; Yoshiara, K ^[3]; Paulius, L M ^[4]; Lee, B W ^[5]; Jardim, R F ^[6]

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1. Univ. of California, San Diego, CA (United States) Los Alamos National Lab., NM (United States)
2. Univ. of California, San Diego, CA (United States)
3. Univ. of California, San Diego, CA (United States) Mitsubishi Electric Corp., Sagamihara (Japan)
4. Univ. of California, San Diego, CA (United States) Western Michigan Univ., Kalamazoo, MI (United States)
5. Univ. of California, San Diego, CA (United States) Hankuk Univ. of Foreign Studies, Yong In Gun (Korea, Republic of)
6. Univ. of California, San Diego, CA (United States) Universidade de Sao Paulo (Brazil); and others

Investigations of Y[sub 1[minus]x]M[sub x]Ba[sub 2]Cu[sub 3]O[sub 7[minus][delta]] (M = Ce, Tn) c-axis oriented thin film specimens show that the rate of depression of T[sub c] with x is larger for M = Th, than for M = Ce and Pr, and suggest that Ce, like Th, is tetravalent in this compound. Hall effect measurements on Y[sub 1[minus]x]Pr[sub x]Ba[sub 2]Cu[sub 3]O[sub 7[minus][delta]] single crystals reveal a T[sup 2] dependence of the cotangent of the Hall angle in the normal state and a [open quotes]negative Hall anomaly[close quotes] below Tc in the superconducting state, in agreement with recent reports. Our research shows that the depth, [Delta], of the negative Hall signal scales with T/T[sub c] and that the maximum value of [Delta] decreases linearly with x and vanishes at x [approx] 0.24. Magnetoresistance measurements on Y[sub 1[minus]x]Pr[sub x]Ba[sub 2]Cu[sub 3]O[sub 7[minus][delta]] single crystals indicate that the irreversibility line H(T[sup *]) obeys a universal scaling relation characterized by an m = 3/2 power law near Tc, with a crossover to a more rapid temperature dependence of below T/Tc [approx] 0.6, similar to that observed for polycrystalline specimens. 56 refs., 10 figs.

• DOE Contract Number: FG03-86ER45230
• OSTI ID: 7071524
• Report Number(s): CONF-930710--; CNN: PD-EXT 91/2743-0
• Conference Information: Journal Name: Journal of Superconductivity; (United States) Journal Volume: 7:1
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ACTINIDE COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CERIUM COMPOUNDS
COPPER COMPOUNDS
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
CRYSTALS
CUPRATES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FILMS
HALL EFFECT
HIGH-TC SUPERCONDUCTORS
MAGNETORESISTANCE
MONOCRYSTALS
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
POLYCRYSTALS
PRASEODYMIUM COMPOUNDS
RARE EARTH COMPOUNDS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THIN FILMS
THORIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS