Magnetic properties of single-crystal Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub 8+[ital y]]: Experimental evidence for a dimensional crossover

Journal Article · Sun May 01 00:00:00 EDT 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.49.12984· OSTI ID:6735888

Pradhan, A K; Roy, S B; Chaddah, P ^[1]; Chen, C; Wanklyn, B M ^[2]

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1. Low Temperature Physics Group, Centre for Advanced Technology, Indore 452 013 (India)
2. Clarendon Laboratory, Department of Physics, Oxford University, Parks Road, Oxford, OX1 3PU (United Kingdom)

Magnetization curves of high-quality superconducting Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub 8+[ital y]] single crystals in fields oriented parallel to the [ital c] axis have been reported at various temperatures. The irreversibility line and magnetic relaxation of this single crystal have been measured in magnetic fields parallel to the [ital c] axis of the crystal. We have observed a low-field anomaly in the magnetization together with a sharp rise of the irreversibility line and a nonlogarithmic magnetic relaxation at 25 K. We argue that 25 K is a boundary temperature where the system undergoes a dimensional crossover from the three-dimensional (3D) to the 2D regime. The relaxation rate also predicts that although the flux creep above this crossover temperature follows the conventional Kim-Anderson thermally activated flux-creep model, below this crossover temperature it follows that predicted by the collective flux pinning or vortex-glass models.

• OSTI ID: 6735888
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 49:18; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

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360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
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ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
CRITICAL CURRENT
CRYSTALS
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MAGNETIC PROPERTIES
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MONOCRYSTALS
OXIDES
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TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
THERMODYNAMIC PROPERTIES
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