Symmetry of phonon, magnetic, and spin-phonon excitations in GdSr2RuCu2O8 single crystals

V. G. Hadjiev; J. Bäckström; V. N. Popov; M. N. Iliev; R. L. Meng; Y. Y. Xue; C. W. Chu; C. W. Chu

Symmetry of phonon, magnetic, and spin-phonon excitations in GdSr₂RuCu₂O₈ single crystals

V. G. Hadjiev, J. Bäckström, V. N. Popov, M. N. Iliev, R. L. Meng, Y. Y. Xue, C. W. Chu, C. W. Chu

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

Abstract

We present a polarized Raman scattering study of GdSr₂RuCu₂O₈ single crystals. In this compound, the RuO₆ octahedra are rotated around the c axis that in turn gives some Raman activity of the oxygen (O_Ru) vibrations at 265 cm^-1 (A_1g), 411 cm^-1 (B_2g) and 607 cm^-1 (B_1g). These vibrations, as well as those of the apical oxygen of RuO₆ at 654 cm^-1 (A_1g) and the Cu-plane oxygen at 318 cm^-1 (B_2g), clearly respond to the onset of magnetic ordering at T_m≈140 K. In particular, the 265 cm^-1 mode hardens anomalously with decreasing temperature below T_m. Notably, the corresponding phonon line is absent in the Raman spectra of GdSr₂NbCu₂O₈ (Nb⁵⁺:4d⁰), a compound isomorphic to GdSr₂RuCu₂O₈ (Ru⁵⁺:4d³). We argue that the eigenvector of the 265 cm^-1 phonon (rotational mode) facilitates efficient modulation of the Ru(t_1g)-O_Ru(p) bands. This modulation gives both Raman scattering strength to the 265 cm^-1 mode and strong spin-phonon coupling.

Original language	English
Article number	134304
Pages (from-to)	1343041-1343046
Number of pages	6
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	64
Issue number	13
Publication status	Published - 1 Oct 2001
Externally published	Yes

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@article{76dca237565a4398a9d38283856b40ed,

title = "Symmetry of phonon, magnetic, and spin-phonon excitations in GdSr2RuCu2O8 single crystals",

abstract = "We present a polarized Raman scattering study of GdSr2RuCu2O8 single crystals. In this compound, the RuO6 octahedra are rotated around the c axis that in turn gives some Raman activity of the oxygen (ORu) vibrations at 265 cm-1 (A1g), 411 cm-1 (B2g) and 607 cm-1 (B1g). These vibrations, as well as those of the apical oxygen of RuO6 at 654 cm-1 (A1g) and the Cu-plane oxygen at 318 cm-1 (B2g), clearly respond to the onset of magnetic ordering at Tm≈140 K. In particular, the 265 cm-1 mode hardens anomalously with decreasing temperature below Tm. Notably, the corresponding phonon line is absent in the Raman spectra of GdSr2NbCu2O8 (Nb5+:4d0), a compound isomorphic to GdSr2RuCu2O8 (Ru5+:4d3). We argue that the eigenvector of the 265 cm-1 phonon (rotational mode) facilitates efficient modulation of the Ru(t1g)-ORu(p) bands. This modulation gives both Raman scattering strength to the 265 cm-1 mode and strong spin-phonon coupling.",

author = "Hadjiev, \{V. G.\} and J. B{\"a}ckstr{\"o}m and Popov, \{V. N.\} and Iliev, \{M. N.\} and Meng, \{R. L.\} and Xue, \{Y. Y.\} and Chu, \{C. W.\} and Chu, \{C. W.\}",

year = "2001",

month = oct,

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language = "English",

volume = "64",

pages = "1343041--1343046",

journal = "Physical Review B - Condensed Matter and Materials Physics",

issn = "0163-1829",

publisher = "American Physical Society",

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TY - JOUR

T1 - Symmetry of phonon, magnetic, and spin-phonon excitations in GdSr2RuCu2O8 single crystals

AU - Hadjiev, V. G.

AU - Bäckström, J.

AU - Popov, V. N.

AU - Iliev, M. N.

AU - Meng, R. L.

AU - Xue, Y. Y.

AU - Chu, C. W.

PY - 2001/10/1

Y1 - 2001/10/1

N2 - We present a polarized Raman scattering study of GdSr2RuCu2O8 single crystals. In this compound, the RuO6 octahedra are rotated around the c axis that in turn gives some Raman activity of the oxygen (ORu) vibrations at 265 cm-1 (A1g), 411 cm-1 (B2g) and 607 cm-1 (B1g). These vibrations, as well as those of the apical oxygen of RuO6 at 654 cm-1 (A1g) and the Cu-plane oxygen at 318 cm-1 (B2g), clearly respond to the onset of magnetic ordering at Tm≈140 K. In particular, the 265 cm-1 mode hardens anomalously with decreasing temperature below Tm. Notably, the corresponding phonon line is absent in the Raman spectra of GdSr2NbCu2O8 (Nb5+:4d0), a compound isomorphic to GdSr2RuCu2O8 (Ru5+:4d3). We argue that the eigenvector of the 265 cm-1 phonon (rotational mode) facilitates efficient modulation of the Ru(t1g)-ORu(p) bands. This modulation gives both Raman scattering strength to the 265 cm-1 mode and strong spin-phonon coupling.

AB - We present a polarized Raman scattering study of GdSr2RuCu2O8 single crystals. In this compound, the RuO6 octahedra are rotated around the c axis that in turn gives some Raman activity of the oxygen (ORu) vibrations at 265 cm-1 (A1g), 411 cm-1 (B2g) and 607 cm-1 (B1g). These vibrations, as well as those of the apical oxygen of RuO6 at 654 cm-1 (A1g) and the Cu-plane oxygen at 318 cm-1 (B2g), clearly respond to the onset of magnetic ordering at Tm≈140 K. In particular, the 265 cm-1 mode hardens anomalously with decreasing temperature below Tm. Notably, the corresponding phonon line is absent in the Raman spectra of GdSr2NbCu2O8 (Nb5+:4d0), a compound isomorphic to GdSr2RuCu2O8 (Ru5+:4d3). We argue that the eigenvector of the 265 cm-1 phonon (rotational mode) facilitates efficient modulation of the Ru(t1g)-ORu(p) bands. This modulation gives both Raman scattering strength to the 265 cm-1 mode and strong spin-phonon coupling.

UR - http://www.scopus.com/inward/record.url?scp=0035494370&partnerID=8YFLogxK

M3 - Journal Article

AN - SCOPUS:0035494370

SN - 0163-1829

VL - 64

SP - 1343041

EP - 1343046

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 13

M1 - 134304

ER -

Symmetry of phonon, magnetic, and spin-phonon excitations in GdSr₂RuCu₂O₈ single crystals

Abstract

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