Magnetic excitations in PrBa2Cu4O8 explored by Raman scattering

A. P. Litvinchuk; L. Börjesson; C. Thomsen; C. W. Chu

doi:10.1002/(SICI)1521-3951(199909)215:1<507::AID-PSSB507>3.0.CO;2-K

Magnetic excitations in PrBa₂Cu₄O₈ explored by Raman scattering

A. P. Litvinchuk, L. Börjesson, C. Thomsen, C. W. Chu

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Abstract

Polarized Raman scattering spectra of PrBa₂Cu₄O₈ were studied in the temperature range 10 to 300 K. An anomalous temperature dependence of the two-magnon peak was found, which softens upon cooling from about 2590 cm^-1 at 300 K to 2480 cm^-1 at 10 K. The observed behavior is opposite to what is known for RBa₂Cu₃O₆, R₂CuO₄ (R = rare earth) and KMnF₃-type antiferromagnets, where the two-magnon peak shifts to higher frequencies upon decreasing the in-plane Cu-O bond length due to either lowering temperature or applying pressure. The experimental data are discussed in view of the semiconductor-metal transition which, according to recent optical and transport studies, occurs in PrBa₂Cu₄O₈ at T* ≈ 150 K.

Original language	English
Pages (from-to)	507-512
Number of pages	6
Journal	Physica Status Solidi (B) Basic Research
Volume	215
Issue number	1
DOIs	https://doi.org/10.1002/(SICI)1521-3951(199909)215:1<507::AID-PSSB507>3.0.CO;2-K
Publication status	Published - 1999 Sep

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1002/(SICI)1521-3951(199909)215:1<507::AID-PSSB507>3.0.CO;2-K

Cite this

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title = "Magnetic excitations in PrBa2Cu4O8 explored by Raman scattering",

abstract = "Polarized Raman scattering spectra of PrBa2Cu4O8 were studied in the temperature range 10 to 300 K. An anomalous temperature dependence of the two-magnon peak was found, which softens upon cooling from about 2590 cm-1 at 300 K to 2480 cm-1 at 10 K. The observed behavior is opposite to what is known for RBa2Cu3O6, R2CuO4 (R = rare earth) and KMnF3-type antiferromagnets, where the two-magnon peak shifts to higher frequencies upon decreasing the in-plane Cu-O bond length due to either lowering temperature or applying pressure. The experimental data are discussed in view of the semiconductor-metal transition which, according to recent optical and transport studies, occurs in PrBa2Cu4O8 at T* ≈ 150 K.",

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T1 - Magnetic excitations in PrBa2Cu4O8 explored by Raman scattering

AU - Litvinchuk, A. P.

AU - Börjesson, L.

AU - Thomsen, C.

AU - Chu, C. W.

PY - 1999/9

Y1 - 1999/9

N2 - Polarized Raman scattering spectra of PrBa2Cu4O8 were studied in the temperature range 10 to 300 K. An anomalous temperature dependence of the two-magnon peak was found, which softens upon cooling from about 2590 cm-1 at 300 K to 2480 cm-1 at 10 K. The observed behavior is opposite to what is known for RBa2Cu3O6, R2CuO4 (R = rare earth) and KMnF3-type antiferromagnets, where the two-magnon peak shifts to higher frequencies upon decreasing the in-plane Cu-O bond length due to either lowering temperature or applying pressure. The experimental data are discussed in view of the semiconductor-metal transition which, according to recent optical and transport studies, occurs in PrBa2Cu4O8 at T* ≈ 150 K.

AB - Polarized Raman scattering spectra of PrBa2Cu4O8 were studied in the temperature range 10 to 300 K. An anomalous temperature dependence of the two-magnon peak was found, which softens upon cooling from about 2590 cm-1 at 300 K to 2480 cm-1 at 10 K. The observed behavior is opposite to what is known for RBa2Cu3O6, R2CuO4 (R = rare earth) and KMnF3-type antiferromagnets, where the two-magnon peak shifts to higher frequencies upon decreasing the in-plane Cu-O bond length due to either lowering temperature or applying pressure. The experimental data are discussed in view of the semiconductor-metal transition which, according to recent optical and transport studies, occurs in PrBa2Cu4O8 at T* ≈ 150 K.

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ER -

Magnetic excitations in PrBa₂Cu₄O₈ explored by Raman scattering

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