Nonequivalence of the anisotropy in the normal state to that in the superconducting state of Bi2Sr2Ca(Cu1−xMx)2Oy (M=Mn, Fe, Co, and Ni)

X. F. Sun; X. Zhao; L. Wang; Q. F. Zhou; W. B. Wu; X.-G. Li

doi:10.1103/PhysRevB.62.11384

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Nonequivalence of the anisotropy in the normal state to that in the superconducting state of Bi2Sr2Ca(Cu1−xMx)2Oy (M=Mn, Fe, Co, and Ni)

X. F. Sun, X. Zhao, L. Wang, Q. F. Zhou, W. B. Wu, X.-G. Li

DOI 10.1103/PhysRevB.62.11384 · Physical Review B

T1

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Abstract

The anisotropic resistivity and second peak of magnetization curves were studied for Bi2Sr2Ca(Cu1−xMx)2Oy (M=Mn, Fe, Co, and Ni) single crystals. The c-axis resistivity ρc(T) and the anisotropy in the normal state γn[=(ρc/ρab)1/2], decrease rapidly with increasing doping concentration x, while the anisotropy factor in the superconducting state, γs, obtained from the second peak field by the relation Bsp=Φ0/(sγs)2, increases systematically with x. This indicates that the anisotropy in the normal state is different from that in the superconducting state, inconsistent with the conventional concept. The present results show that γn and γs should be determined by different mechanisms in highly layered cuprates.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	83.5	Pressure not reported	zero_resistance
Bi2Sr2Ca(Cu0.996Mn0.004)2Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	73	Pressure not reported	zero_resistance
Bi2Sr2Ca(Cu0.981Mn0.019)2Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	63	Pressure not reported	zero_resistance
Bi2Sr2Ca(Cu0.966Fe0.034)2Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	71.5	Pressure not reported	zero_resistance
Bi2Sr2Ca(Cu0.956Fe0.044)2Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	59	Pressure not reported	zero_resistance
Bi2Sr2Ca(Cu0.993Co0.007)2Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	72	Pressure not reported	zero_resistance
Bi2Sr2Ca(Cu0.968Co0.032)2Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	60.5	Pressure not reported	zero_resistance
Bi2Sr2Ca(Cu0.977Ni0.023)2Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	75.5	Pressure not reported	zero_resistance
Bi2Sr2Ca(Cu0.957Ni0.043)2Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	67.5	Pressure not reported	zero_resistance