Origin of the insulating state in honeycomb iridates and rhodates

I. I. Mazin, S. Manni, K. Foyevtsova, Harald Olaf Jeschke, P. Gegenwart, Roser Valentí

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

A burning question in the emerging field of spin-orbit driven insulating iridates, such as Na2IrO3 and Li2IrO 3, is whether the observed insulating state should be classified as a Mott-Hubbard insulator derived from a half-filled relativistic j eff=1/2 band or as a band insulator where the gap is assisted by spin-orbit interaction or Coulomb correlations or both. The difference between these two interpretations is that only for the former strong spin-orbit coupling (λâ‰W, where W is the bandwidth) is essential. We have synthesized the isostructural and isoelectronic Li2RhO3 and report its electrical resistivity and magnetic susceptibility. Remarkably, it shows insulating behavior together with fluctuating effective S=1/2 moments, similar to Na2IrO3 and Li2IrO3, although in Rh4+ (4d5) the spin-orbit coupling is greatly reduced. We show that this behavior has a nonrelativistic one-electron origin (although Coulomb correlations assist in opening the gap) and can be traced to the formation of quasimolecular orbitals, similar to those in Na2IrO 3.

Original languageEnglish
Article number035115
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume88
Issue number3
DOIs
Publication statusPublished - Jul 12 2013
Externally publishedYes

Fingerprint

Orbits
orbits
insulators
magnetic permeability
spin-orbit interactions
emerging
Magnetic susceptibility
bandwidth
moments
orbitals
electrical resistivity
Bandwidth
Electrons
electrons

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Origin of the insulating state in honeycomb iridates and rhodates. / Mazin, I. I.; Manni, S.; Foyevtsova, K.; Jeschke, Harald Olaf; Gegenwart, P.; Valentí, Roser.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 88, No. 3, 035115, 12.07.2013.

Research output: Contribution to journalArticle

Mazin, I. I. ; Manni, S. ; Foyevtsova, K. ; Jeschke, Harald Olaf ; Gegenwart, P. ; Valentí, Roser. / Origin of the insulating state in honeycomb iridates and rhodates. In: Physical Review B - Condensed Matter and Materials Physics. 2013 ; Vol. 88, No. 3.
@article{3d8d9e0fa0314845902b256a9cceb4f5,
title = "Origin of the insulating state in honeycomb iridates and rhodates",
abstract = "A burning question in the emerging field of spin-orbit driven insulating iridates, such as Na2IrO3 and Li2IrO 3, is whether the observed insulating state should be classified as a Mott-Hubbard insulator derived from a half-filled relativistic j eff=1/2 band or as a band insulator where the gap is assisted by spin-orbit interaction or Coulomb correlations or both. The difference between these two interpretations is that only for the former strong spin-orbit coupling (λ{\^a}‰W, where W is the bandwidth) is essential. We have synthesized the isostructural and isoelectronic Li2RhO3 and report its electrical resistivity and magnetic susceptibility. Remarkably, it shows insulating behavior together with fluctuating effective S=1/2 moments, similar to Na2IrO3 and Li2IrO3, although in Rh4+ (4d5) the spin-orbit coupling is greatly reduced. We show that this behavior has a nonrelativistic one-electron origin (although Coulomb correlations assist in opening the gap) and can be traced to the formation of quasimolecular orbitals, similar to those in Na2IrO 3.",
author = "Mazin, {I. I.} and S. Manni and K. Foyevtsova and Jeschke, {Harald Olaf} and P. Gegenwart and Roser Valent{\'i}",
year = "2013",
month = "7",
day = "12",
doi = "10.1103/PhysRevB.88.035115",
language = "English",
volume = "88",
journal = "Physical Review B-Condensed Matter",
issn = "1098-0121",
publisher = "American Physical Society",
number = "3",

}

TY - JOUR

T1 - Origin of the insulating state in honeycomb iridates and rhodates

AU - Mazin, I. I.

AU - Manni, S.

AU - Foyevtsova, K.

AU - Jeschke, Harald Olaf

AU - Gegenwart, P.

AU - Valentí, Roser

PY - 2013/7/12

Y1 - 2013/7/12

N2 - A burning question in the emerging field of spin-orbit driven insulating iridates, such as Na2IrO3 and Li2IrO 3, is whether the observed insulating state should be classified as a Mott-Hubbard insulator derived from a half-filled relativistic j eff=1/2 band or as a band insulator where the gap is assisted by spin-orbit interaction or Coulomb correlations or both. The difference between these two interpretations is that only for the former strong spin-orbit coupling (λâ‰W, where W is the bandwidth) is essential. We have synthesized the isostructural and isoelectronic Li2RhO3 and report its electrical resistivity and magnetic susceptibility. Remarkably, it shows insulating behavior together with fluctuating effective S=1/2 moments, similar to Na2IrO3 and Li2IrO3, although in Rh4+ (4d5) the spin-orbit coupling is greatly reduced. We show that this behavior has a nonrelativistic one-electron origin (although Coulomb correlations assist in opening the gap) and can be traced to the formation of quasimolecular orbitals, similar to those in Na2IrO 3.

AB - A burning question in the emerging field of spin-orbit driven insulating iridates, such as Na2IrO3 and Li2IrO 3, is whether the observed insulating state should be classified as a Mott-Hubbard insulator derived from a half-filled relativistic j eff=1/2 band or as a band insulator where the gap is assisted by spin-orbit interaction or Coulomb correlations or both. The difference between these two interpretations is that only for the former strong spin-orbit coupling (λâ‰W, where W is the bandwidth) is essential. We have synthesized the isostructural and isoelectronic Li2RhO3 and report its electrical resistivity and magnetic susceptibility. Remarkably, it shows insulating behavior together with fluctuating effective S=1/2 moments, similar to Na2IrO3 and Li2IrO3, although in Rh4+ (4d5) the spin-orbit coupling is greatly reduced. We show that this behavior has a nonrelativistic one-electron origin (although Coulomb correlations assist in opening the gap) and can be traced to the formation of quasimolecular orbitals, similar to those in Na2IrO 3.

UR - http://www.scopus.com/inward/record.url?scp=84880842627&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84880842627&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.88.035115

DO - 10.1103/PhysRevB.88.035115

M3 - Article

AN - SCOPUS:84880842627

VL - 88

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

IS - 3

M1 - 035115

ER -