Theory of spin-charge-orbital states in the frustrated system RFe 2O4

Sumio Ishihara; Makoto Naka; Aya Nagano

Theory of spin-charge-orbital states in the frustrated system RFe ₂O₄

Sumio Ishihara, Makoto Naka, Aya Nagano

SCI - Physics

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

Electronic structure in multiferroic compound RFe₂O₄ is studied theoretically. We suggest that orbital degree of freedom in a Fe ²⁺ ion is active. The effective Hamiltonian for spin, charge and orbital degrees of freedom is derived. Numerical analyses with the multi-canonical Monte-Carlo simulation show that the electric polarization is attributed to the charge order with momentum (1/3,1/3). A magnitude of the polarization is enhanced around the magnetic ordering temperature due to the coupling between spin and charge. Conventional orbital order is not expected from the numerical calculation. We discuss possible orbital state at low temperatures.

Original language	English
Title of host publication	Ferroelectrics and Multiferroics
Pages	116-121
Number of pages	6
Publication status	Published - 2006 Dec 1
Event	2006 MRS Fall Meeting - Boston, MA, United States Duration: 2006 Nov 27 → 2006 Nov 29

Publication series

Name	Materials Research Society Symposium Proceedings
Volume	966
ISSN (Print)	0272-9172

Other

Other	2006 MRS Fall Meeting
Country/Territory	United States
City	Boston, MA
Period	06/11/27 → 06/11/29

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Cite this

@inproceedings{f971236a440d45ebac54eb4aa181e559,

title = "Theory of spin-charge-orbital states in the frustrated system RFe 2O4",

abstract = "Electronic structure in multiferroic compound RFe2O4 is studied theoretically. We suggest that orbital degree of freedom in a Fe 2+ ion is active. The effective Hamiltonian for spin, charge and orbital degrees of freedom is derived. Numerical analyses with the multi-canonical Monte-Carlo simulation show that the electric polarization is attributed to the charge order with momentum (1/3,1/3). A magnitude of the polarization is enhanced around the magnetic ordering temperature due to the coupling between spin and charge. Conventional orbital order is not expected from the numerical calculation. We discuss possible orbital state at low temperatures.",

author = "Sumio Ishihara and Makoto Naka and Aya Nagano",

year = "2006",

month = dec,

day = "1",

language = "English",

isbn = "9781604234183",

series = "Materials Research Society Symposium Proceedings",

pages = "116--121",

booktitle = "Ferroelectrics and Multiferroics",

note = "2006 MRS Fall Meeting ; Conference date: 27-11-2006 Through 29-11-2006",

}

TY - GEN

T1 - Theory of spin-charge-orbital states in the frustrated system RFe 2O4

AU - Ishihara, Sumio

AU - Naka, Makoto

AU - Nagano, Aya

PY - 2006/12/1

Y1 - 2006/12/1

N2 - Electronic structure in multiferroic compound RFe2O4 is studied theoretically. We suggest that orbital degree of freedom in a Fe 2+ ion is active. The effective Hamiltonian for spin, charge and orbital degrees of freedom is derived. Numerical analyses with the multi-canonical Monte-Carlo simulation show that the electric polarization is attributed to the charge order with momentum (1/3,1/3). A magnitude of the polarization is enhanced around the magnetic ordering temperature due to the coupling between spin and charge. Conventional orbital order is not expected from the numerical calculation. We discuss possible orbital state at low temperatures.

AB - Electronic structure in multiferroic compound RFe2O4 is studied theoretically. We suggest that orbital degree of freedom in a Fe 2+ ion is active. The effective Hamiltonian for spin, charge and orbital degrees of freedom is derived. Numerical analyses with the multi-canonical Monte-Carlo simulation show that the electric polarization is attributed to the charge order with momentum (1/3,1/3). A magnitude of the polarization is enhanced around the magnetic ordering temperature due to the coupling between spin and charge. Conventional orbital order is not expected from the numerical calculation. We discuss possible orbital state at low temperatures.

UR - http://www.scopus.com/inward/record.url?scp=41149102036&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=41149102036&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:41149102036

SN - 9781604234183

T3 - Materials Research Society Symposium Proceedings

SP - 116

EP - 121

BT - Ferroelectrics and Multiferroics

T2 - 2006 MRS Fall Meeting

Y2 - 27 November 2006 through 29 November 2006

ER -