High-Field Quasiparticle Tunneling in Bi2Sr2CaCu2O8+δ: Negative Magnetoresistance in the Superconducting State

N. Morozov; L. Krusin-Elbaum; T. Shibauchi; L. N. Bulaevskii; M. P. Maley; Yu. I. Latyshev; T. Yamashita

doi:10.1103/PhysRevLett.84.1784

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High-Field Quasiparticle Tunneling in Bi2Sr2CaCu2O8+δ: Negative Magnetoresistance in the Superconducting State

N. Morozov, L. Krusin-Elbaum, T. Shibauchi, L. N. Bulaevskii, M. P. Maley, Yu. I. Latyshev, T. Yamashita

DOI 10.1103/PhysRevLett.84.1784 · Physical Review Letters

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Abstract

We report on the c-axis resistivity ρc(H) in Bi2Sr2CaCu2O8+δ that peaks in quasistatic magnetic fields up to 60 T. By suppressing the Josephson part of the two-channel (Cooper pair/quasiparticle) conductivity σc(H), we find that the negative slope of ρc(H) above the peak is due to quasiparticle tunneling conductivity σq(H) across the CuO2 layers below Hc2. At high fields (a) σq(H) grows linearly with H, and (b) ρc(T) tends to saturate ( σc≠0) as T→0, consistent with the scattering at the nodes of the d-wave gap. A superlinear σq(H) marks the normal state above Tc.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	92.5	Pressure not reported	unknown
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	89	Pressure not reported	unknown
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown