skip to main content

Title: Disordered dimer state in electron-doped Sr3Ir2O7

Spin excitations are explored in the electron-doped spin-orbit Mott insulator (Sr1-xLax)3Ir2O7. As this bilayer square lattice system is doped into the metallic regime, long-range antiferromagnetism vanishes, yet a spectrum of gapped spin excitation remains. Excitation lifetimes are strongly damped with increasing carrier concentration, and the energy-integrated spectral weight becomes nearly momentum independent as static spin order is suppressed. Local magnetic moments, absent in the parent system, grow in metallic samples and approach values consistent with one J=12 impurity per electron doped. Our combined data suggest that the magnetic spectra of metallic (Sr1-xLax)3Ir2O7 are best described by excitations out of a disordered dimer state.
Authors:
; ; ; ; ; ; ;
Publication Date:
OSTI Identifier:
1325153
DOE Contract Number:
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review B; Journal Volume: 94; Journal Issue: 10
Publisher:
American Physical Society (APS)
Research Org:
Argonne National Laboratory (ANL)
Sponsoring Org:
National Science Foundation (NSF); USDOE Office of Science - Office of Basic Energy Sciences - Scientific User Facilities Division; Natural Sciences and Engineering Research Council of Canada (NSERC)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY