Second-order phase transition in Ca2 - x Srx RuO4: A Raman study

H. Rho; S. L. Cooper; S. Nakatsuji; Y. Maeno

doi:10.1016/j.jmmm.2006.10.351

Second-order phase transition in Ca_{2 - x} Sr_x RuO₄: A Raman study

H. Rho, S. L. Cooper, S. Nakatsuji, Y. Maeno

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

Abstract

We use Raman scattering to study the second-order structural transition in metallic Ca_{2 - x} Sr_x RuO₄ for x = 0.3. With increasing temperature, the following phonon behaviors are observed in the Raman spectra: the 320 cm^{- 1} mode exhibits an enhancement both in peak energy and in intensity near the characteristic temperature T_O ∼ 220 K; the 374 cm^{- 1} mode exhibits a significant decrease in peak energy with increasing temperature toward T_O; and the intensity of the 374 cm^{- 1} mode gradually decreases with increasing temperature, and finally disappears above 230 K. These phonon behaviors suggest that a second-order structural transition occurs in the metallic phase of Ca_1.7 Sr_0.3 RuO₄ through T_O ≃ 220 K.

Original language	English (US)
Pages (from-to)	e266-e268
Journal	Journal of Magnetism and Magnetic Materials
Volume	310
Issue number	2 SUPPL. PART 2
DOIs	https://doi.org/10.1016/j.jmmm.2006.10.351
State	Published - Mar 2007

Keywords

Ca Sr RuO
Phase transition
Raman scattering

ASJC Scopus subject areas

Condensed Matter Physics

Online availability

10.1016/j.jmmm.2006.10.351

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@article{3e9df14d31334ff194cd32b67a3c73dc,

title = "Second-order phase transition in Ca2 - x Srx RuO4: A Raman study",

abstract = "We use Raman scattering to study the second-order structural transition in metallic Ca2 - x Srx RuO4 for x = 0.3. With increasing temperature, the following phonon behaviors are observed in the Raman spectra: the 320 cm- 1 mode exhibits an enhancement both in peak energy and in intensity near the characteristic temperature TO ∼ 220 K; the 374 cm- 1 mode exhibits a significant decrease in peak energy with increasing temperature toward TO; and the intensity of the 374 cm- 1 mode gradually decreases with increasing temperature, and finally disappears above 230 K. These phonon behaviors suggest that a second-order structural transition occurs in the metallic phase of Ca1.7 Sr0.3 RuO4 through TO ≃ 220 K.",

keywords = "Ca Sr RuO, Phase transition, Raman scattering",

author = "H. Rho and Cooper, {S. L.} and S. Nakatsuji and Y. Maeno",

note = "Funding Information: This paper was partially supported by the international collaborative research funds of Chonbuk National University (ICR-2006-4), 2006, and by the Korea Research Foundation Grant funded by the Korean Government (MOEHRD) (KRF-2005-015-C00179). The research at the University of Illinois was funded by DOE (DEFG02-91ER45439) and NSF (DMR-0244502). Work at Kyoto was supported in part by Grants-in-Aids for Scientific Research from JSPS.",

year = "2007",

month = mar,

doi = "10.1016/j.jmmm.2006.10.351",

language = "English (US)",

volume = "310",

pages = "e266--e268",

journal = "Journal of Magnetism and Magnetic Materials",

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TY - JOUR

T1 - Second-order phase transition in Ca2 - x Srx RuO4

T2 - A Raman study

AU - Rho, H.

AU - Cooper, S. L.

AU - Nakatsuji, S.

AU - Maeno, Y.

N1 - Funding Information: This paper was partially supported by the international collaborative research funds of Chonbuk National University (ICR-2006-4), 2006, and by the Korea Research Foundation Grant funded by the Korean Government (MOEHRD) (KRF-2005-015-C00179). The research at the University of Illinois was funded by DOE (DEFG02-91ER45439) and NSF (DMR-0244502). Work at Kyoto was supported in part by Grants-in-Aids for Scientific Research from JSPS.

PY - 2007/3

Y1 - 2007/3

N2 - We use Raman scattering to study the second-order structural transition in metallic Ca2 - x Srx RuO4 for x = 0.3. With increasing temperature, the following phonon behaviors are observed in the Raman spectra: the 320 cm- 1 mode exhibits an enhancement both in peak energy and in intensity near the characteristic temperature TO ∼ 220 K; the 374 cm- 1 mode exhibits a significant decrease in peak energy with increasing temperature toward TO; and the intensity of the 374 cm- 1 mode gradually decreases with increasing temperature, and finally disappears above 230 K. These phonon behaviors suggest that a second-order structural transition occurs in the metallic phase of Ca1.7 Sr0.3 RuO4 through TO ≃ 220 K.

AB - We use Raman scattering to study the second-order structural transition in metallic Ca2 - x Srx RuO4 for x = 0.3. With increasing temperature, the following phonon behaviors are observed in the Raman spectra: the 320 cm- 1 mode exhibits an enhancement both in peak energy and in intensity near the characteristic temperature TO ∼ 220 K; the 374 cm- 1 mode exhibits a significant decrease in peak energy with increasing temperature toward TO; and the intensity of the 374 cm- 1 mode gradually decreases with increasing temperature, and finally disappears above 230 K. These phonon behaviors suggest that a second-order structural transition occurs in the metallic phase of Ca1.7 Sr0.3 RuO4 through TO ≃ 220 K.

KW - Ca Sr RuO

KW - Phase transition

KW - Raman scattering

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