https://jhell.imipolex.biz/tags/kondo/ Recent content in Kondo on Jack Hellerstedt Hugo en-us Mon, 13 Sep 2021 12:00:00 +1000 https://jhell.imipolex.biz/2021/09/13/kagome-metal-organic-framework/ Mon, 13 Sep 2021 12:00:00 +1000 https://jhell.imipolex.biz/2021/09/13/kagome-metal-organic-framework/ <div class="post-thumbnail"> <img width="825" height="510" src="https://jhell.imipolex.biz/images/blog/kagome-metal-organic-framework/kagome-mof-schematic.png" class="attachment-post-thumbnail size-post-thumbnail wp-post-image" alt="DCA Cu Kagome schematic" decoding="async" fetchpriority="high" /> </div> <p><a href="https://scholar.google.com/citations?user=zHayFesAAAAJ&amp;hl=en&amp;oi=ao" data-type="URL" data-id="https://scholar.google.com/citations?user=zHayFesAAAAJ&amp;hl=en&amp;oi=ao">Dhaneesh Kumar</a> has extensively studied the on-surface properties of the <a href="https://pubchem.ncbi.nlm.nih.gov/compound/9_10-Dicyanoanthracene" data-type="URL" data-id="https://pubchem.ncbi.nlm.nih.gov/compound/9_10-Dicyanoanthracene">DCA molecule</a> for <a href="https://bridges.monash.edu/articles/thesis/Atomically_Engineered_Electronic_Two-Dimensional_Organic_Nanostructures/14493825" data-type="URL" data-id="https://bridges.monash.edu/articles/thesis/Atomically_Engineered_Electronic_Two-Dimensional_Organic_Nanostructures/14493825">his PhD</a>. After getting a good handle on <a rel="noreferrer noopener" href="http://doi.org/10.1021/acsnano.9b05950" target="_blank">just the DCA on Ag111</a>, we started sprinkling some Cu atoms into the mix.</p> <div class="wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex"> <div class="wp-block-column is-layout-flow wp-block-column-is-layout-flow"> <p>We observed the same honeycomb kagome structure that <a rel="noreferrer noopener" href="http://doi.wiley.com/10.1002/anie.200802543" target="_blank">forms on Cu111</a>&#8211; as seen in an <a href="https://en.wikipedia.org/wiki/Non-contact_atomic_force_microscopy">ncAFM</a> <a href="http://doi.org/10.1103/PhysRevLett.115.076101">force volume</a> shown in the right image. It has also been <a rel="noreferrer noopener" href="https://onlinelibrary.wiley.com/doi/full/10.1002/adfm.202100519" target="_blank">synthesized on graphene.</a><br><br>The key difference we observed on Ag111 was the <a href="https://en.wikipedia.org/wiki/Kondo_effect">Kondo effect</a>, an <a href="https://en.wikipedia.org/wiki/Scanning_tunneling_spectroscopy">STS peak</a> at Fermi we tracked up to 150 K!<br><br>The consistent spatial distribution of this feature across the MOF was another key observation.</p>