Temperature dependence of anisotropic lower critical fields in (La sub 1 minus x Sr sub x ) sub 2 CuO sub 4

Journal Article · Thu Mar 01 04:00:00 EST 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.41.4823· OSTI ID:6977437

Naito, M; Matsuda, A ^[1]; Kitazawa, K; Kambe, S ^[2]; Tanaka, I; Kojima, H ^[3]

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1. Basic Research Laboratories Nippon Telegraph and Telephone Corporation, Musashino-shi, Tokyo 180, Japan (JP)
2. Department of Industrial Chemistry, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan (JP)
3. Institute of Inorganic Synthesis, Yamanashi University, Kofu 400, Japan (JP)

The anisotropic lower critical fields {ital H}{sub {ital c}1} are determined from a novel procedure based on the Bean's critical-state model to pick up the onset of flux penetration in broad zero-field-cooled magnetization curves in (La{sub 1{minus}{ital x}}Sr{sub {ital x}}){sub 2}CuO{sub 4} ({ital x}{approx}0.07) single crystals. The values of {ital H}{sub {ital c}1} at {ital T}=0 K are estimated to be 70 G for {ital H}{parallel} layer and 300 G for {ital H}{perpendicular} layer. The temperature dependence of {ital H}{sub {ital c}1} is such that it tends to saturate towards the lowest temperature measured (2 K) in contrast to the other recent results which report the abnormal upturn of the {ital H}{sub {ital c}1}-{ital T} curve at low temperatures. Instead the results indicate that the critical current density in plane has a strong temperature dependence even in the temperature range well below {ital T}{sub {ital c}} and becomes {similar to}10{sup 6} A/cm{sup 2} at 2 K.

• OSTI ID: 6977437
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 41:7; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CRITICAL FIELD
CRYSTALS
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MAGNETIC FIELDS
MAGNETIZATION
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS