Macroscopic quantum tunneling and phase diffusion in a La2−xSrxCuO4 intrinsic Josephson junction stack

Yuimaru Kubo; A. O. Sboychakov; Franco Nori; Y. Takahide; S. Ueda; I. Tanaka; A. T. M. N. Islam; Y. Takano

doi:10.1103/PhysRevB.86.144532

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Macroscopic quantum tunneling and phase diffusion in a La2−xSrxCuO4 intrinsic Josephson junction stack

Yuimaru Kubo, A. O. Sboychakov, Franco Nori, Y. Takahide, S. Ueda, I. Tanaka, A. T. M. N. Islam, Y. Takano

DOI 10.1103/PhysRevB.86.144532 · Physical Review B

T1

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Abstract

We performed measurements of switching current distribution in a submicrometer La2−xSrxCuO4 (LSCO) intrinsic Josephson junction (IJJ) stack in a wide temperature range. The escape rate saturates below approximately 2 K, indicating that the escape event is dominated by a macroscopic quantum tunneling (MQT) process with a crossover temperature T*≈2K. We applied the theory of MQT for IJJ stacks, taking into account dissipation and the phase retrapping effect in the LSCO IJJ stack. The theory is in good agreement with the experiment both in the MQT and in the thermal activation regimes.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2CaCuO8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La1.91Sr0.09CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown