%0 Journal Article %T Shot noise and magnetism of Pt atomic chains: Accumulation of points at the boundary %+ Kamerlingh Onnes Laboratorium %+ Faculty of Chemistry %+ Groupe Modélisation et Théorie (GMT) %+ Scuola Internazionale Superiore di Studi Avanzati / International School for Advanced Studies (SISSA / ISAS) %A Kumar, Manohar, M %A Tal, Oren %A Smit, Roel, M %A Smogunov, Alexander %A Tosatti, Erio, M %A van Ruitenbeek, Jan %Z This work is part of the research programme of the Foundation for Fundamental Research on Matter (FOM),which is financially supported by the Netherlands Organisation for Scientific Research (NWO). The calculations at CEA were performed using HPC resources from GENCI-CCRT, Grant2012-x2013096813 on Curie supercomputer. Work in Trieste was partly sponsored by PRIN/COFIN 2010LLKJBX 004,Sinergia CRSII2136287/1 %< avec comité de lecture %@ 1098-0121 %J Physical Review B: Condensed Matter and Materials Physics (1998-2015) %I American Physical Society %V 88 %P 245431 %8 2013 %D 2013 %R 10.1103/PhysRevB.88.245431 %Z PACS numbers: 73.40.Jn, 72.70+m, 73.63.Nm, 61.46.Km %Z Physics [physics]Journal articles %X Pt is known to show spontaneous formation of monatomic chains upon breaking a metallic contact. From model calculations these chains are expected to be spin polarized. However, direct experimental evidence for or against magnetism is lacking. Here, we investigate shot noise as a potential source of information on the magnetic state of Pt atomic chains. We observe a remarkable structure in the distribution of measured shot noise levels, where the data appear to be confined to the region of non-magnetic states. While this suggests a non-magnetic ground state for the Pt atomic chains, from calculations we find that the magnetism in Pt chains is due to 'actor' electron channels, which contribute very little to ballistic conductance and noise. On the other hand, there are weakly polarized 'spectator' channels, which carry most of the current and are only slightly modified by the magnetic state. %G English %2 https://cea.hal.science/cea-01481341/document %2 https://cea.hal.science/cea-01481341/file/1401.3983.pdf %L cea-01481341 %U https://cea.hal.science/cea-01481341 %~ CEA %~ CNRS %~ OPENAIRE %~ GENCI %~ IRAMIS-SPEC %~ IRAMIS %~ GS-PHYSIQUE