High Tc superconductivity in a critical range of micro-strain and charge density in diborides. Agrestini, S., Di Castro, D., Sansone, M., Saini, N. L., Saccone, A., De Negri, S., Giovannini, M., Colapietro, M., & Bianconi, A. Journal of Physics: Condensed Matter, 13(50):11689–11695, 2001.
High Tc superconductivity in a critical range of micro-strain and charge density in diborides [link]Paper  doi  abstract   bibtex   
Expansion of the superlattice of boron layers, with AB 2 structure, due to different intercalated A atoms has been studied to understand the emergence of high T c superconductivity in the diborides. The structure of these metal heterostructures at the atomic limit (MEHALs) (with A = Al, Mg, Ti, Hf, Zr) has been measured by synchrotron x-ray diffraction. The increasing atomic radius of the intercalated A ions induces an increase of (1) the separation between the boron layers and (2) the tensile micro-strain ε of the B–B distance within the boron layers. The results show that the superconductivity in these MEHALs appears in a critical region in a phase diagram controlled by two variables, the micro-strain and the charge density (ε, ρ).
@article{agrestini_high_2001,
	title = {High {Tc} superconductivity in a critical range of micro-strain and charge density in diborides},
	volume = {13},
	issn = {0953-8984},
	url = {http://dx.doi.org/10.1088/0953-8984/13/50/328},
	doi = {10.1088/0953-8984/13/50/328},
	abstract = {Expansion of the superlattice of boron layers, with AB 2 structure, due to different intercalated A atoms has been studied to understand the emergence of high T c superconductivity in the diborides. The structure of these metal heterostructures at the atomic limit (MEHALs) (with A = Al, Mg, Ti, Hf, Zr) has been measured by synchrotron x-ray diffraction. The increasing atomic radius of the intercalated A ions induces an increase of (1) the separation between the boron layers and (2) the tensile micro-strain ε of the B–B distance within the boron layers. The results show that the superconductivity in these MEHALs appears in a critical region in a phase diagram controlled by two variables, the micro-strain and the charge density (ε, ρ).},
	number = {50},
	journal = {Journal of Physics: Condensed Matter},
	author = {Agrestini, S. and Di Castro, D. and Sansone, M. and Saini, N. L. and Saccone, A. and De Negri, S. and Giovannini, M. and Colapietro, M. and Bianconi, A.},
	year = {2001},
	pages = {11689--11695}
}

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