Direct observation of charge re-distribution in a MgB 2 superconductor
Abstract To study the origin of negative thermal expansion effects near the superconducting transition temperature T C in MgB 2 , low-temperature high-energy synchrotron radiation x-ray diffraction was used to probe the charge redistribution near the boron atoms. Our results reveal that the in-plane...
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Published in | Superconductor science & technology Vol. 29; no. 4; p. 45001 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
01.04.2016
|
Online Access | Get full text |
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Summary: | Abstract
To study the origin of negative thermal expansion effects near the superconducting transition temperature T
C
in MgB
2
, low-temperature high-energy synchrotron radiation x-ray diffraction was used to probe the charge redistribution near the boron atoms. Our results reveal that the in-plane hole-distribution of B
−
hops through the direct orbital overlap of Mg
2+
along the
c
-axis at 50 K and is re-distributed out-of-plane. This study shows that the out-of-plane
π
-hole distribution plays a dominant role in the possible origin of superconductivity and negative thermal effects in MgB
2
. |
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ISSN: | 0953-2048 1361-6668 |
DOI: | 10.1088/0953-2048/29/4/045001 |