Carrier dependences of anisotropy and irreversibility field in Pb2Sr2Y1-xCaxCu3O8 single crystals

Takashi Noji, Tsutomu Takabayashi, Masatsune Kato, Terukazu Nishizaki, Norio Kobayashi, Yoji Koike

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10 Citations (Scopus)


Anisotropic properties of the electrical resistivity and the resistive superconducting transition under magnetic fields have been investigated for the single-crystal Pb2Sr2Y1-xCaxCu3O8 with 0 ≦ x ≦ 0.5 in the so-called underdoped region. The anisotropic parameter γ ≡ (m*c/m*ab) 1 2 is found to increase from ∼5 to 25 with decreasing x, namely, with decreasing hole concentration. The irreversibility field Hirr has been studied from the magnetization measurements for H {curly logical or} c-axis. In the high-temperature regime near Tc, Hirr is found to be proportional to 1-T/Tc) 3 2 for x∼0.5 and to (1-T/Tc) 3 2 or (1-T/Tc)2 for smaller x values. In this regime, Hirr is also found to be proportional to γ-2. In the low-temperature regime, on the other hand, Hirr grows exponentially as approximately expressed as e-T/To, and shows a still stronger growth as eTo/T at much lower temperatures for smaller x values. These behaviors are discussed in terms of flux creep, vortex-lattice melting and vortex-glass melting.

Original languageEnglish
Pages (from-to)10-18
Number of pages9
JournalPhysica C: Superconductivity and its Applications
Issue number1-2
Publication statusPublished - 1995 Dec 1


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