Metallic "Ferroelectricity" in the Pyrochlore Cd 2Re2O7

I. A. Sergienko; V. Keppens; M. McGuire; R. Jin; J. He; S. H. Curnoe; B. C. Sales; P. Blaha; D. J. Singh; K. Schwarz; D. Mandrus

Metallic "Ferroelectricity" in the Pyrochlore Cd ₂Re₂O₇

I. A. Sergienko, V. Keppens, M. McGuire, R. Jin, J. He, S. H. Curnoe, B. C. Sales, P. Blaha, D. J. Singh, K. Schwarz, D. Mandrus

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96 Scopus citations

Abstract

The measurements of the elastic moduli of Cd₂Re ₂O₇ through the 200 K cubic-to-tetragonal phase transition, were presented. Resonant ultrasound spectroscopy measurements were performed as a function of temperature to determine the elastic moduli of the sample. Analysis of the elastic moduli using Landau theory showed that the transition was consistent with Cd₂Re₂O₇ being classified as a ferroelectric metal in the weaker sense as described by Anderson and Blount. First-principles calculations which were performed in the local density approximation, showed that the dominant lattice instability corresponded to a twofold degenerate mode with E_u symmetry.

Original language	English
Article number	065501
Pages (from-to)	655011-655014
Number of pages	4
Journal	Physical Review Letters
Volume	92
Issue number	6
State	Published - Feb 13 2004
Externally published	Yes

Cite this

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title = "Metallic {"}Ferroelectricity{"} in the Pyrochlore Cd 2Re2O7",

abstract = "The measurements of the elastic moduli of Cd2Re 2O7 through the 200 K cubic-to-tetragonal phase transition, were presented. Resonant ultrasound spectroscopy measurements were performed as a function of temperature to determine the elastic moduli of the sample. Analysis of the elastic moduli using Landau theory showed that the transition was consistent with Cd2Re2O7 being classified as a ferroelectric metal in the weaker sense as described by Anderson and Blount. First-principles calculations which were performed in the local density approximation, showed that the dominant lattice instability corresponded to a twofold degenerate mode with Eu symmetry.",

author = "Sergienko, {I. A.} and V. Keppens and M. McGuire and R. Jin and J. He and Curnoe, {S. H.} and Sales, {B. C.} and P. Blaha and Singh, {D. J.} and K. Schwarz and D. Mandrus",

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T1 - Metallic "Ferroelectricity" in the Pyrochlore Cd 2Re2O7

AU - Sergienko, I. A.

AU - Keppens, V.

AU - McGuire, M.

AU - Jin, R.

AU - He, J.

AU - Curnoe, S. H.

AU - Sales, B. C.

AU - Blaha, P.

AU - Singh, D. J.

AU - Schwarz, K.

AU - Mandrus, D.

PY - 2004/2/13

Y1 - 2004/2/13

N2 - The measurements of the elastic moduli of Cd2Re 2O7 through the 200 K cubic-to-tetragonal phase transition, were presented. Resonant ultrasound spectroscopy measurements were performed as a function of temperature to determine the elastic moduli of the sample. Analysis of the elastic moduli using Landau theory showed that the transition was consistent with Cd2Re2O7 being classified as a ferroelectric metal in the weaker sense as described by Anderson and Blount. First-principles calculations which were performed in the local density approximation, showed that the dominant lattice instability corresponded to a twofold degenerate mode with Eu symmetry.

AB - The measurements of the elastic moduli of Cd2Re 2O7 through the 200 K cubic-to-tetragonal phase transition, were presented. Resonant ultrasound spectroscopy measurements were performed as a function of temperature to determine the elastic moduli of the sample. Analysis of the elastic moduli using Landau theory showed that the transition was consistent with Cd2Re2O7 being classified as a ferroelectric metal in the weaker sense as described by Anderson and Blount. First-principles calculations which were performed in the local density approximation, showed that the dominant lattice instability corresponded to a twofold degenerate mode with Eu symmetry.

UR - http://www.scopus.com/inward/record.url?scp=8844270368&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:8844270368

SN - 0031-9007

VL - 92

SP - 655011

EP - 655014

JO - Physical Review Letters

JF - Physical Review Letters

IS - 6

M1 - 065501

ER -

Metallic "Ferroelectricity" in the Pyrochlore Cd ₂Re₂O₇

Abstract

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