Dissipation Effects of the Phase in Higher Order Switching Events of Intrinsic Josephson Junctions

Comparative Study of First and Second Switches with Nearly Identical Switching Current in Bi2Sr2Ca0.85Y0.15Cu2Oy Intrinsic Josephson Junctions

“…However, the anomalous increase of T 2nd cr was found to be independent of the device structure of IJJs with different heat-transfer environment 7) and the order of phase switches, 10) throwing doubt on the self-heating effects after the 1st SW.…”

“…11) In addition, the microwave-induced resonant peak structure was observed in the switching current distribution below T 2nd cr , suggesting the occurrence of the quantum phase escapes and the formation of energy level quantization (ELQ) in a potential well. 12,13) Thus, many experimental results 7,[9][10][11][12][13][14][15] support that the MQT state is realized even in the 2nd SWs of IJJs, although the value of T cr (typically ∼ 10 K for the optimal doped Bi2212 IJJs) is much higher than the value predicted in the conventional theory. 16) As a qualitative explanation for this anomaly, we proposed that the ac Josephson current occurring after the 1st SW possibly passes through other junctions near the phase-switched junction, inducing the rapid oscillation in a tilted-washboard potential and effectively reducing the barrier height ∆U(I) for the 2nd SW. 11) Similar effects are expected for the quantum phase escapes under the strong microwave irradiation.…”

“…[2][3][4][5] The most striking feature is that a crossover temperature, T cr , to the MQT state in the phase switch from the first to the second resistive branch (2nd SW) is largely enhanced compared to that from the zero voltage to the first resistive branch (1st SW) in the multi-branched current-voltage (I-V) characteristics of IJJs. [6][7][8][9][10][11][12][13][14][15] An early study 6) suggested that such an enhancement was due to the self-heating effects in the first resistive state, based on the consideration that a series array of uniform Josephson junctions should show the same value of T cr as long as the current flowing in each junction agrees with the externally-applied bias current.However, the anomalous increase of T 2nd cr was found to be independent of the device structure of IJJs with different heat-transfer environment 7) and the order of phase switches, 10) throwing doubt on the self-heating effects after the 1st SW.…”

Comparative study of superconducting and normal-state anisotropy in Fe$_{1+y}$Te$_{0.6}$Se$_{0.4}$ superconductors with controlled amounts of interstitial excess Fe

“…The bridges in the ab plane and along the c axis used for the measurements of normal state anisotropy, as shown schematically in the insets of Figs. 3(a) and 3(b), were fabricated by using the focused ion beam (FIB) technique [47][48][49].…”

Achieving the depairing limit along the c axis in Fe1+yTe1−xSeSun1, Ohnuma2, Ayukawa3 et al. 2020Phys. Rev. BSelf Cite170110View full textAdd to dashboardCite

“…The c-axis bridge, as shown schematically in Fig. 1(b), was fabricated by using the focused ion beam (FIB) technique [58,59]. The single crystal was first cleaved into a slice with a thickness smaller than 10 µm, and fixed , where λc is the penetration depth along c-axis, ∼ 1.6 µm at 5 K [32].…”