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 nonmagnetic states. While this suggests a nonmagnetic 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.
|Titolo:||Shot noise and magnetism of Pt atomic chains: Accumulation of points at the boundary|
|Autori:||Kumar Manohar; Tal Oren; Smit Roel H. M.; Smogunov Alexander; Tosatti E; van Ruitenbeek Jan M.|
|Rivista:||PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS|
|Data di pubblicazione:||2013|
|Digital Object Identifier (DOI):||10.1103/PhysRevB.88.245431|
|Appare nelle tipologie:||1.1 Journal article|