First-Order Melting of a Weak Spin-Orbit Mott Insulator into a Correlated Metal

Abstract

Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/eng/view/object/?id=52705cc0-e17a-4735-a2b2-c0250cf7e564 http://nparc.cisti-icist.nrc-cnrc.gc.ca/fra/voir/objet/?id=52705cc0-e17a-4735-a2b2-c0250cf7e564 The electronic phase diagram of the weak spin-orbit Mott insulator (Sr 1−x La x Þ 3 Ir 2 O 7 is determined via an exhaustive experimental study. Upon doping electrons via La substitution, an immediate collapse in resistivity occurs along with a narrow regime of nanoscale phase separation comprised of antiferromagnetic, insulating regions and paramagnetic, metallic puddles persisting until x ≈ 0.04. Continued electron doping results in an abrupt, first-order phase boundary where the Néel state is suppressed and a homogenous, correlated, metallic state appears with an enhanced spin susceptibility and local moments. As the metallic state is stabilized, a weak structural distortion develops and suggests a competing instability with the parent spin-orbit Mott state. First-Order Melting of a Weak Spin-Orbit Mott Insulator into a Correlated Metal

Influence of electron doping on the ground state of(Sr1−xLax)2IrO4

“…Correspondingly, in Fig. 11 (a) the La dopants appear as dark-centered bright squares 28 , whose number is consistent with the x = 0.05 nominal doping of the sample.…”

“…This also contrasts the electron-doped phase diagram of (Sr 1−x La x ) 3 Ir 2 O 7 where static AF order abruptly vanishes across the MIT phase boundary 28 . Within both La-substituted Sr-214 and Sr-327, light electron doping renders an electronically phase separated ground state with coexisting metallic and gapped regions; however, beyond a threshold value of 6% electrons per Ir in Sr-327, AF order collapses into a globally gapless metal.…”

“…In Sr-214, continued electron doping beyond 6% electrons per Ir fails to fully destabilize the SOM state, and a phase separated state persists until the limit of La-substitution (≈ 12% electrons per Ir). This is likely due to either a nearby competing electronic instability in Sr-327 28 or simply due to the inherently stronger Mott state of Sr-214. Blue circles denote the AF ordering transition measured directly with neutron scattering data, and pink triangles denote the onset of irreversibility in magnetization data.…”

Structural investigation of the bilayer iridateSr3Ir2O7

“…14, 25 The solution of the magnetic structure depicts antiferromagneticaly ordered moments aligned out-of-plane, along theâ-direction; 13,17,42 however neutron scattering would be unable to resolve small (< 1…”

Doping Evolution of Magnetic Order and Magnetic Excitations in (Sr1−xLax)3Lu1, McNally2, Sala3 et al. 2017Phys. Rev. Lett.348380View full textAdd to dashboardCite

“…The strong interlayer couplings and magnetic anisotropy including the bonddirectional pseudodipolar interactions arising from the J eff = . In contrast, a doping-dependent negative electronic compressibility was discovered in later ARPES measurements, indicating an exotic correlated metallic state [32,35]. In order to reveal the nature of the metallic state, a detailed study of the elementary excitations is required that can determine the doping evolution of the electronic interactions, especially the magnetic couplings.…”