Goldstone modes and electromagnon fluctuations in the conical cycloid state of a multiferroic

Sumanta Tewari; Chuanwei Zhang; John Toner; S. Das Sarma

doi:10.1103/PhysRevB.78.144427

Goldstone modes and electromagnon fluctuations in the conical cycloid state of a multiferroic

Sumanta Tewari
, Chuanwei Zhang
, John Toner
, S. Das Sarma

Department of Physics

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

Using a phenomenological Ginzburg-Landau theory for the magnetic conical cycloid state of a multiferroic, which has been recently reported in the cubic spinel CoCr₂O₄, we discuss its low-energy fluctuation spectrum. We identify the Goldstone modes of the conical cycloidal order and deduce their dispersion relations whose signature anisotropy in momentum space reflects the symmetries broken by the ordered state. We discuss the soft polarization fluctuations, the "electromagnons," associated with these magnetic modes and make several experimental predictions which can be tested in neutron-scattering and optical experiments.

Original language	English
Article number	144427
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	78
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.78.144427
State	Published - Oct 30 2008

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10.1103/PhysRevB.78.144427

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title = "Goldstone modes and electromagnon fluctuations in the conical cycloid state of a multiferroic",

abstract = "Using a phenomenological Ginzburg-Landau theory for the magnetic conical cycloid state of a multiferroic, which has been recently reported in the cubic spinel CoCr2O4, we discuss its low-energy fluctuation spectrum. We identify the Goldstone modes of the conical cycloidal order and deduce their dispersion relations whose signature anisotropy in momentum space reflects the symmetries broken by the ordered state. We discuss the soft polarization fluctuations, the {"}electromagnons,{"} associated with these magnetic modes and make several experimental predictions which can be tested in neutron-scattering and optical experiments.",

author = "Sumanta Tewari and Chuanwei Zhang and John Toner and \{Das Sarma\}, S.",

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T1 - Goldstone modes and electromagnon fluctuations in the conical cycloid state of a multiferroic

AU - Tewari, Sumanta

AU - Zhang, Chuanwei

AU - Toner, John

AU - Das Sarma, S.

PY - 2008/10/30

Y1 - 2008/10/30

N2 - Using a phenomenological Ginzburg-Landau theory for the magnetic conical cycloid state of a multiferroic, which has been recently reported in the cubic spinel CoCr2O4, we discuss its low-energy fluctuation spectrum. We identify the Goldstone modes of the conical cycloidal order and deduce their dispersion relations whose signature anisotropy in momentum space reflects the symmetries broken by the ordered state. We discuss the soft polarization fluctuations, the "electromagnons," associated with these magnetic modes and make several experimental predictions which can be tested in neutron-scattering and optical experiments.

AB - Using a phenomenological Ginzburg-Landau theory for the magnetic conical cycloid state of a multiferroic, which has been recently reported in the cubic spinel CoCr2O4, we discuss its low-energy fluctuation spectrum. We identify the Goldstone modes of the conical cycloidal order and deduce their dispersion relations whose signature anisotropy in momentum space reflects the symmetries broken by the ordered state. We discuss the soft polarization fluctuations, the "electromagnons," associated with these magnetic modes and make several experimental predictions which can be tested in neutron-scattering and optical experiments.

UR - https://www.scopus.com/pages/publications/55349102708

U2 - 10.1103/PhysRevB.78.144427

DO - 10.1103/PhysRevB.78.144427

M3 - Article

AN - SCOPUS:55349102708

SN - 1098-0121

VL - 78

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 14

M1 - 144427

ER -

Goldstone modes and electromagnon fluctuations in the conical cycloid state of a multiferroic

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