PHASE SEPARATION AND JOSEPHSON-COUPLING ORIGIN FOR THE ANOMALOUS Hc2 BEHAVIOR IN OVERDOPED Bi2Sr2-xLaxCuO6+$\delta$ CRYSTALS

doi:10.1088/1004-423X/8/9/010

Abstract

Abstract Hole-overdoped Bi₂Sr_2-xLa_xCuO_6+$\delta$ single crystals with two coexistent superconducting transitions have been intensively studied by measuring the dc magnetic susceptibility. It is found that the coexistence of these two phases cannot be attributed to any chemical or vortex dynamical effect but to some intrinsic driving force, such as the electronic-driven phase separation. Furthermore, the upper critical fields of the two phases behave in a rather different way; that is, one of them shows a "normal H_c2 behavior" which can be described by the critical fluctuation theory, while the other exhibits an "anomalous H_c2 behavior" and can be well explained by a recent theory based on an assumption of a Josephson-coupling origin, indicating a strong evidence of Josephson-coupling origin for the upward curvature of the so-called H_c2 in high T_c superconductors.

Received: 04 April 1999
Accepted manuscript online:

PACS:	74.50.+r	(Tunneling phenomena; Josephson effects)
	74.72.Jt
	75.30.Cr	(Saturation moments and magnetic susceptibilities)
	74.25.Ha	(Magnetic properties including vortex structures and related phenomena)
	74.25.Op	(Mixed states, critical fields, and surface sheaths)
	74.25.Qt

Fund: Project supported by the National Natural Science Foundatoin of China (Grant No. 19825111).

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Yang Wan-li (杨万里), Wen Hai-hu (闻海虎), Ni Yong-ming (倪泳明), Zhao Zhong-xian (赵忠贤) PHASE SEPARATION AND JOSEPHSON-COUPLING ORIGIN FOR THE ANOMALOUS H_c2 BEHAVIOR IN OVERDOPED Bi₂Sr_2-xLa_xCuO_6+$\delta$ CRYSTALS 1999 Acta Physica Sinica (Overseas Edition) 8 702

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PHASE SEPARATION AND JOSEPHSON-COUPLING ORIGIN FOR THE ANOMALOUS Hc2 BEHAVIOR IN OVERDOPED Bi2Sr2-xLaxCuO6+$\delta$ CRYSTALS

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PHASE SEPARATION AND JOSEPHSON-COUPLING ORIGIN FOR THE ANOMALOUS H_c2 BEHAVIOR IN OVERDOPED Bi₂Sr_2-xLa_xCuO_6+$\delta$ CRYSTALS