Spin- 1 2 triangular lattice with orbital degeneracy in a metallic oxide Ag2 Ni O2

H. Yoshida, Yuji Muraoka, T. Sörgel, M. Jansen, Z. Hiroi

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

A metallic and magnetic transition metal oxide Ag2 Ni O2 is studied by means of resistivity, magnetic susceptibility, specific heat, and x-ray diffraction. The crystal structure is characterized by an alternating stacking of a Ni3+ O2 layer and a (Ag2) + layer, the former realizing a spin- 1 2 triangular lattice with eg orbital degeneracy and the latter providing itinerant electrons. It is found that the Ni O2 layer exhibits orbital ordering at Ts =260 K and antiferromagnetic spin ordering at TN =56 K. Moreover, a moderately large mass enhancement is found for the itinerant electrons, suggesting a significant contribution from the nearly localized Ni 3d state to the Ag 5s state that forms a broad band.

Original languageEnglish
Article number020408
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume73
Issue number2
DOIs
Publication statusPublished - 2006
Externally publishedYes

Fingerprint

Oxides
orbitals
oxides
Electrons
Magnetic susceptibility
Specific heat
Transition metals
magnetic metals
Diffraction
Crystal structure
X rays
metal oxides
x ray diffraction
electrons
transition metals
specific heat
broadband
magnetic permeability
electrical resistivity
crystal structure

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Spin- 1 2 triangular lattice with orbital degeneracy in a metallic oxide Ag2 Ni O2. / Yoshida, H.; Muraoka, Yuji; Sörgel, T.; Jansen, M.; Hiroi, Z.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 73, No. 2, 020408, 2006.

Research output: Contribution to journalArticle

@article{fb394b86599642e9a22f230e66289d63,
title = "Spin- 1 2 triangular lattice with orbital degeneracy in a metallic oxide Ag2 Ni O2",
abstract = "A metallic and magnetic transition metal oxide Ag2 Ni O2 is studied by means of resistivity, magnetic susceptibility, specific heat, and x-ray diffraction. The crystal structure is characterized by an alternating stacking of a Ni3+ O2 layer and a (Ag2) + layer, the former realizing a spin- 1 2 triangular lattice with eg orbital degeneracy and the latter providing itinerant electrons. It is found that the Ni O2 layer exhibits orbital ordering at Ts =260 K and antiferromagnetic spin ordering at TN =56 K. Moreover, a moderately large mass enhancement is found for the itinerant electrons, suggesting a significant contribution from the nearly localized Ni 3d state to the Ag 5s state that forms a broad band.",
author = "H. Yoshida and Yuji Muraoka and T. S{\"o}rgel and M. Jansen and Z. Hiroi",
year = "2006",
doi = "10.1103/PhysRevB.73.020408",
language = "English",
volume = "73",
journal = "Physical Review B-Condensed Matter",
issn = "1098-0121",
publisher = "American Physical Society",
number = "2",

}

TY - JOUR

T1 - Spin- 1 2 triangular lattice with orbital degeneracy in a metallic oxide Ag2 Ni O2

AU - Yoshida, H.

AU - Muraoka, Yuji

AU - Sörgel, T.

AU - Jansen, M.

AU - Hiroi, Z.

PY - 2006

Y1 - 2006

N2 - A metallic and magnetic transition metal oxide Ag2 Ni O2 is studied by means of resistivity, magnetic susceptibility, specific heat, and x-ray diffraction. The crystal structure is characterized by an alternating stacking of a Ni3+ O2 layer and a (Ag2) + layer, the former realizing a spin- 1 2 triangular lattice with eg orbital degeneracy and the latter providing itinerant electrons. It is found that the Ni O2 layer exhibits orbital ordering at Ts =260 K and antiferromagnetic spin ordering at TN =56 K. Moreover, a moderately large mass enhancement is found for the itinerant electrons, suggesting a significant contribution from the nearly localized Ni 3d state to the Ag 5s state that forms a broad band.

AB - A metallic and magnetic transition metal oxide Ag2 Ni O2 is studied by means of resistivity, magnetic susceptibility, specific heat, and x-ray diffraction. The crystal structure is characterized by an alternating stacking of a Ni3+ O2 layer and a (Ag2) + layer, the former realizing a spin- 1 2 triangular lattice with eg orbital degeneracy and the latter providing itinerant electrons. It is found that the Ni O2 layer exhibits orbital ordering at Ts =260 K and antiferromagnetic spin ordering at TN =56 K. Moreover, a moderately large mass enhancement is found for the itinerant electrons, suggesting a significant contribution from the nearly localized Ni 3d state to the Ag 5s state that forms a broad band.

UR - http://www.scopus.com/inward/record.url?scp=33144463562&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33144463562&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.73.020408

DO - 10.1103/PhysRevB.73.020408

M3 - Article

AN - SCOPUS:33144463562

VL - 73

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

IS - 2

M1 - 020408

ER -