Conductance of Atom-Sized Zn Contacts

Suzuki, Ryo; Mukai, Yasuhiro; Tsutsui, Makusu; Kurokawa, Shu; Sakai, Akira

doi:10.1143/jjap.45.7217

Cited by 14 publications

(17 citation statements)

References 38 publications

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“…For other metals, however, their conductance histograms are not necessarily the same at low and RTs. In particular, considerable differences can be found in the conductance histograms of non‐cubic metals such as Zn 7, 8, Co 9, 10, Ga 11, and Mg 12. Histograms of these metals commonly exhibit a couple of low‐conductance peaks at (1–2) G 0 at 4 K but not at RT.…”

Section: Introductionmentioning

confidence: 99%

Formation of atom‐sized contacts of Mg and Mg alloys at room temperature

Takahashi

Kurokawa

Sakai

2012

Physica Status Solidi (a)

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We have measured the conductance of atom‐sized contacts of dilute MgZnCa and MgZnCe alloys at room temperature (RT) and found two new peaks at (1.6–1.7)G0 and (2.6–2.9)G0 (where $G_{0} \equiv 2e^{2} /h$ is the quantum unit of conductance) in their conductance histograms. Because the solute level in these alloys is too low to affect the contact conductance, these peaks can be considered as low‐conductance peaks of pure Mg, which have not been observed in the histogram of pure Mg at RT [Smit et al., New J. Phys. 11, 073043 (2009)]. The MgZnCa and MgZnCe alloys differ from pure Mg primarily in their superior ductility. Thus, the observation of new peaks for these alloys suggests that the absence of low‐conductance peaks below 4G0 in the room‐temperature histogram of pure Mg is likely related to the plasticity of Mg.

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Section: Introductionmentioning

confidence: 99%

Formation of atom‐sized contacts of Mg and Mg alloys at room temperature

Takahashi

Kurokawa

Sakai

2012

Physica Status Solidi (a)

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“…The observed higher Zn is thus compatible with the lower critical current density for the contact break of Zn ASCs. 16 Above 0.35 V, log m starts to deviate from the linear bias dependence and rises steeply with the bias. The threshold bias for the sharp upturn of m is denoted by V th .…”

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confidence: 96%

Bias-induced local heating in atom-sized metal contacts at 77K

Tsutsui

Kurokawa

Sakai

2007

Applied Physics Letters

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Local heating in Zn atom-sized contacts is studied at 77K under high biases. Switching rate ν of two-level fluctuations of the contact conductance is measured and statistically analyzed to estimate the contact effective temperature. Typical logν increases linearly with the bias up to 0.35V, which suggests negligible contact heating in the low-bias regime. Above 0.4V, however, logν rises steeply with the bias due to an onset of contact overheating. The estimated contact temperature rises more rapidly with the bias than the V dependence derived theoretically.

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“…This meansÎ b ∝Ĝ b orÎ b /Ĝ b =( const.). Figure 9 shows the example for Ag, but the same proportionality relationship betweenÎ b andĜ b can be found for noble metals, Au and Cu, and other metals such as Al (Minowa et al, 2005a), Zn (Suzuki et al, 2006), Pt (Minowa et al, 2005b), and Mo (Minowa et al, 2005b). The physical meaning of the observed proportionality between I b andĜ b can be understood if we notice thatĜ b is in the range of the Sharvin conductance and thus proportional to the contact area A as shown in Eq.…”

Section: Gb (G0)mentioning

confidence: 59%