Temperature dependence of anisotropic lower critical fields in (La1-xSrx)2CuO4

Michio Naito, Azusa Matsuda, Koichi Kitazawa, Shinsaku Kambe, Isao Tanaka, Hironao Kojima

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

The anisotropic lower critical fields Hc1 are determined from a novel procedure based on the Beans critical-state model to pick up the onset of flux penetration in broad zero-field-cooled magnetization curves in (La1-xSrx)2CuO4 (x0.07) single crystals. The values of Hc1 at T=0 K are estimated to be 70 G for H layer and 300 G for H layer. The temperature dependence of Hc1 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 Hc1-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 Tc and becomes 106 A/cm2 at 2 K.

Original languageEnglish
Pages (from-to)4823-4826
Number of pages4
JournalPhysical Review B
Volume41
Issue number7
DOIs
Publication statusPublished - 1990 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

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