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High Tc superconductivity at a critical strain and charge density in diborides

We report variation of lattice structure in diborides (AB2) with different A atoms to identify the special case of MgB2 showing high Tc superconductivity. High purity MgB2 (Tc~39 K) has been prepared by direct reaction of the elements and the lattice parameters are measured by x-ray diffraction determining the strain e of the B-B distance. The results show that the superconductivity in these intermetallics appear near a critical point in a two variables (strain and charge density) phase diagram at (ec, rc).

preprint2001arXivOpen access
A. BianconiN. L. SainiD. Di CastroS. AgrestiniG. CampiA. SacconeS. De NegriM. Giovannini M. Colapietro
cond-mat.supr-con
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Open access8 authors1 topic
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A. BianconiN. L. SainiD. Di CastroS. AgrestiniG. CampiA. SacconeS. De NegriM. Giovannini M. Colapietro

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