Phonon anomalies versus magnetic ordering in CuO

A. B. Kuz'menko; D. Van Der Marel; P. J.M. Van Bentum; E. A. Tishchenko; C. Presura; A. A. Bush

doi:10.1016/S0921-4526(99)02557-0

Phonon anomalies versus magnetic ordering in CuO

A. B. Kuz'menko^*
, D. Van Der Marel
, P. J.M. Van Bentum
, E. A. Tishchenko
, C. Presura
, A. A. Bush

^*Corresponding author for this work

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

5 Citations (Scopus)

Abstract

We report the first measurements of FIR and MIR reflectivity of single-crystal monoclinic antiferromagnetic copper monoxide (CuO) in a wide temperature range (7-300 K) when b-axis and ac-plane polarized modes are completely separated and excited in transverse geometry. Previously reported softening of the A_u³ mode at the Néel transition is confirmed and found to be up to two times more significant (about 10%). For the first time an emergence of several new IR-active lines at low temperatures is observed. The highest frequency new mode at 690 cm^-1 strongly hardens and strengthens with cooling. The data are discussed in terms of strong spin-phonon coupling and possible charge disproportionation at low T.

Original language	English
Pages (from-to)	1396-1397
Number of pages	2
Journal	Physica B: Condensed Matter
Volume	284-288
Issue number	PART II
DOIs	https://doi.org/10.1016/S0921-4526(99)02557-0
Publication status	Published - 2000
Externally published	Yes

Keywords

Charge disproportionation
Infrared spectroscopy
Magnetic ordering
Spin-phonon interaction

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10.1016/S0921-4526(99)02557-0

Cite this

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title = "Phonon anomalies versus magnetic ordering in CuO",

abstract = "We report the first measurements of FIR and MIR reflectivity of single-crystal monoclinic antiferromagnetic copper monoxide (CuO) in a wide temperature range (7-300 K) when b-axis and ac-plane polarized modes are completely separated and excited in transverse geometry. Previously reported softening of the Au3 mode at the N{\'e}el transition is confirmed and found to be up to two times more significant (about 10\%). For the first time an emergence of several new IR-active lines at low temperatures is observed. The highest frequency new mode at 690 cm-1 strongly hardens and strengthens with cooling. The data are discussed in terms of strong spin-phonon coupling and possible charge disproportionation at low T.",

keywords = "Charge disproportionation, Infrared spectroscopy, Magnetic ordering, Spin-phonon interaction",

author = "Kuz'menko, \{A. B.\} and \{Van Der Marel\}, D. and \{Van Bentum\}, \{P. J.M.\} and Tishchenko, \{E. A.\} and C. Presura and Bush, \{A. A.\}",

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doi = "10.1016/S0921-4526(99)02557-0",

language = "English",

volume = "284-288",

pages = "1396--1397",

journal = "Physica B: Condensed Matter",

issn = "0921-4526",

publisher = "Elsevier",

number = "PART II",

}

TY - JOUR

T1 - Phonon anomalies versus magnetic ordering in CuO

AU - Kuz'menko, A. B.

AU - Van Der Marel, D.

AU - Van Bentum, P. J.M.

AU - Tishchenko, E. A.

AU - Presura, C.

AU - Bush, A. A.

PY - 2000

Y1 - 2000

N2 - We report the first measurements of FIR and MIR reflectivity of single-crystal monoclinic antiferromagnetic copper monoxide (CuO) in a wide temperature range (7-300 K) when b-axis and ac-plane polarized modes are completely separated and excited in transverse geometry. Previously reported softening of the Au3 mode at the Néel transition is confirmed and found to be up to two times more significant (about 10%). For the first time an emergence of several new IR-active lines at low temperatures is observed. The highest frequency new mode at 690 cm-1 strongly hardens and strengthens with cooling. The data are discussed in terms of strong spin-phonon coupling and possible charge disproportionation at low T.

AB - We report the first measurements of FIR and MIR reflectivity of single-crystal monoclinic antiferromagnetic copper monoxide (CuO) in a wide temperature range (7-300 K) when b-axis and ac-plane polarized modes are completely separated and excited in transverse geometry. Previously reported softening of the Au3 mode at the Néel transition is confirmed and found to be up to two times more significant (about 10%). For the first time an emergence of several new IR-active lines at low temperatures is observed. The highest frequency new mode at 690 cm-1 strongly hardens and strengthens with cooling. The data are discussed in terms of strong spin-phonon coupling and possible charge disproportionation at low T.

KW - Charge disproportionation

KW - Infrared spectroscopy

KW - Magnetic ordering

KW - Spin-phonon interaction

UR - https://www.scopus.com/pages/publications/0033703598

U2 - 10.1016/S0921-4526(99)02557-0

DO - 10.1016/S0921-4526(99)02557-0

M3 - Article

AN - SCOPUS:0033703598

SN - 0921-4526

VL - 284-288

SP - 1396

EP - 1397

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

IS - PART II

ER -

Phonon anomalies versus magnetic ordering in CuO

Abstract

Keywords

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