Fundamental and harmonic susceptibilities of YBa sub 2 Cu sub 3 O sub 7 minus. delta

Journal Article · Tue May 01 00:00:00 EDT 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.41.8937· OSTI ID:6883893

Ishida, T ^[1]; Goldfarb, R B ^[2]

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1. Department of Physics, Ibaraki University, Mito 310, Japan (JP)
2. Electromagnetic Technology Division, National Institute of Standards Technology, Boulder, Colorado 80303 (USA)

We have examined the complex harmonic magnetic susceptibilities {chi}{sub {ital n}}={chi}{sub {ital n}}{sup {prime}}{minus}{ital i}{chi}{sub {ital n}}{sup {prime}{prime}} ({ital n}=1,2,3,...,10) of the sintered high-critical-temperature (high-{ital T}{sub {ital c}}) superconductor YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}. The experimental variables for the measurements of {chi}{sub {ital n}} were the sample temperature {ital T} (10{le}{ital T}{le}110 K), the ac magnetic field amplitude {ital H}{sub ac} (1.4 {mu}T{le}{mu}{sub 0}{ital H}{sub ac}{le}8.5 mT), frequency {ital f} (7.3{le}{ital f}{le}1460 Hz), and the magnitude of a superimposed dc field {ital H}{sub dc} ({vert bar}{mu}{sub 0}{ital H}{sub dc}{vert bar}{le}8.5 mT). As functions of temperature, {chi}{sub 1}{sup {prime}} and {chi}{sub 1}{sup {prime}{prime}} depend on both {ital H}{sub ac} and {ital H}{sub dc}. In particular, the {chi}{sub 1}{sup {prime}} transition curve can shift to {ital higher} temperatures with increasing {ital H}{sub dc}. Odd-harmonic susceptibilities were measured as functions of temperature below {ital T}{sub {ital c}} for zero {ital H}{sub dc}; both even and odd harmonics were observed for nonzero {ital H}{sub dc}. At fixed temperature, the odd-harmonic susceptibilities are even functions of {ital H}{sub dc}, while the even-harmonic susceptibilities are odd functions of {ital H}{sub dc}. We compared the experimental intergrain {ital coupling} characteristics of {chi}{sub {ital n}}{sup {prime}} and {chi}{sub {ital n}}{sup {prime}{prime}} with theoretical susceptibility curves based on magnetization equations derived by Ji {ital et} {ital al}. from a simplified Kim model for critical current density.

• OSTI ID: 6883893
• Journal Information: Physical Review, B: Condensed Matter; (USA), Vol. 41:13; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
MAGNETIC SUSCEPTIBILITY
COPPER OXIDES
YTTRIUM OXIDES
GRANULAR MATERIALS
HARMONICS
LOW TEMPERATURE
MAGNETIC FIELDS
SINTERING
SUPERCONDUCTORS
TYPE-II SUPERCONDUCTORS
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
FABRICATION
MAGNETIC PROPERTIES
MATERIALS
OSCILLATIONS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties