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Josephson effect in MgB_2 break junctions | | R.S. Gonnelli
; A. Calzolari
; D. Daghero
; G.A. Ummarino
; V.A. Stepanov
; G. Giunchi
; S. Ceresara
; G. Ripamonti
; | | Date: |
11 May 2001 | | Journal: | Phys. Rev. Lett. 87, 097001 (2001) | | Subject: | Superconductivity | cond-mat.supr-con | | Abstract: | We present the first observation of the DC and AC Josephson effect in MgB_2 break junctions. The junctions, obtained at 4.2 K in high-quality, high-density polycrystalline metallic MgB_2 samples, show a non-hysteretic DC Josephson effect. By irradiating the junctions with microwaves we observe clear Shapiro steps spaced by the ideal $Delta V$ value. The temperature dependence of the DC Josephson current and the dependence of the height of the steps on the microwave power are obtained. These results are a direct prove for the existence of pairs with charge 2e in this new metallic superconductor and give evidence of the superconductor-normal metal-superconductor weak link character of these junctions. | | Source: | arXiv, cond-mat/0105241 | | Services: | Forum | Review | PDF | Favorites | |
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