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Superconductivity in Dense $MgB_2$ Wires | | P. C. Canfield
; D. K. Finnemore
; S. L. Bud’ko
; J. E. Ostenson
; G. Lapertot
; C. E. Cunningham
; C. Petrovic
; | | Date: |
16 Feb 2001 | | Subject: | Superconductivity | cond-mat.supr-con | | Abstract: | $MgB_2$ becomes superconducting just below 40 K. Whereas porous polycrystalline samples of $MgB_2$ can be synthesized from boron powders, in this letter we demonstrate that dense wires of $MgB_2$ can be prepared by exposing boron filaments to $Mg$ vapor. The resulting wires have a diameter of 160 ${mu}m$, are better than 80% dense and manifest the full $chi = -1/4{pi}$ shielding in the superconducting state. Temperature-dependent resistivity measurements indicate that $MgB_2$ is a highly conducting metal in the normal state with $
ho (40 K)$ = 0.38 $mu Ohm$-$cm$. Using this value, an electronic mean free path, $l approx 600~AA$ can be estimated, indicating that $MgB_2$ wires are well within the clean limit. $T_c$, $H_{c2}(T)$, and $J_c$ data indicate that $MgB_2$ manifests comparable or better superconducting properties in dense wire form than it manifests as a sintered pellet. | | Source: | arXiv, cond-mat/0102289 | | Services: | Forum | Review | PDF | Favorites | |
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