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Souchkov, A. B.; Simpson, J. R.; Quijada, Manuel A.; Ishibashi, Hiroki; Hur, N.; Ahn, J. S.; Cheong, Sang‐Wook; Millis, Andrew J.; Drew, H. D.

doi:10.1103/physrevlett.91.027203

Cited by 134 publications

(114 citation statements)

References 14 publications

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“…13 This seems reasonable as the short-range antiferromagnetic interaction should remain at temperatures below θ CW . Indeed, the optical process occurs locally and it could be sensitive to short-range magnetic ordering.…”

Section: Resultsmentioning

confidence: 99%

“…13 For a systematic comparison between the hexa-RMnO 3 samples, we normalized the experimental temperature with T N (T Nn ≡T / T N ), where the values of 56 K, 70 K, 60 K, 75 K, and 90 K were used as T N for R = Gd, Tb, Dy, Ho, and Lu, respectively. 12,13,15,16,22 The peak positions were also normalized to the peak position at T N (ω n ). As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Souchkov et al performed a temperaturedependent optical spectroscopic study on single crystal hexa-LuMnO 3 . 13 They observed a peak shift of the optical absorption structure at ~1.7 eV as a function of temperature and found an anomaly of the peak shift at T N . They suggested that the temperature dependence of the absorption peak could be related to the antiferromagnetic exchange coupling in hexa-LuMnO 3 .…”

Section: Introductionmentioning

confidence: 99%

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Optical spectroscopic investigation on the coupling of electronic and magnetic structure in multiferroic hexagonalRMnO3(R=Gd, Tb, Dy, and Ho) t

et al. 2008

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We investigated the effects of temperature and magnetic field on the electronic structure of hexagonal RMnO 3 (R = Gd, Tb, Dy, and Ho) thin films using optical spectroscopy. As the magnetic ordering of the system was disturbed, a systematic change in the electronic structure was commonly identified in this series. The optical absorption peak near 1.7 eV showed an unexpectedly large shift of more than 150 meV from 300 K to 15 K, accompanied by an anomaly of the shift at the Néel temperature. The magnetic field dependent measurement clearly revealed a sizable shift of the corresponding peak when a high magnetic field was applied. Our findings indicated strong coupling between the magnetic ordering and the electronic structure in the multiferroic hexagonal RMnO 3 compounds. PACS number(s): 78.20.Ci, 78.66.Nk, 77.90.+k,

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optical spectroscopic investigation on the coupling of electronic and magnetic structure in multiferroic hexagonalRMnO3(R=Gd, Tb, Dy, and Ho) t

et al. 2008

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“…Coupling between electrical and magnetic properties are particularly interesting in multiferroic materials, which present simultaneously two or more ferroic or antiferroic order parameters. Optical spectroscopy is a very powerful tool to understand the driving mechanism of the ferroelectric transition and, eventually, its coupling to magnetic ordering [10,11]. Nevertheless, only a few Raman [12,13,14] and infrared (IR) [15,16] studies on BiFeO 3 are known to date.…”

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confidence: 99%

Infrared phonon dynamics of a multiferroicBiFeO3single crystal

et al. 2007

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We discuss the first infrared reflectivity measurement on a BiFeO3 single crystal between 5 K and room temperature. The 9 predicted ab-plane E phonon modes are fully and unambiguously determined. The frequencies of the 4 A1 c-axis phonons are found. These results settle issues between theory and data on ceramics. Our findings show that the softening of the lowest frequency E mode is responsible for the temperature dependence of the dielectric constant, indicating that the ferroelectric transition in BiFeO3 is soft-mode driven.PACS numbers: 78.30.-j, 77.84.-s, 77.22.-d The interplay between magnetic and dielectric properties is an intriguing subject that was already discussed by Pierre Curie in 1894 [1]. Such, magnetoelectric effects were subject of extensive studies during the 1960s [2,3,4]. More recently, the ability of controlling the dielectric properties through a magnetic field and viceversa renewed the interest in these materials [6,7,8]. Coupling between electrical and magnetic properties are particularly interesting in multiferroic materials, which present simultaneously two or more ferroic or antiferroic order parameters. Optical spectroscopy is a very powerful tool to understand the driving mechanism of the ferroelectric transition and, eventually, its coupling to magnetic ordering [10,11]. Nevertheless, only a few Raman [12,13,14] and infrared (IR) [15,16] studies on BiFeO 3 are known to date. Surprisingly none of the IR measurements were carried out on single crystals. There are two important open questions concerning the electrodynamics of BiFeO 3 : (i) the phonon modes symmetry; and (ii) the role (or absence of thereof) of phonon softening in the ferroelectric transition.In its ferroelectric phase, BiFeO 3 belongs to the R3c (C 6 3v ) space group, which derives from the ideal (paraelectric) P m3m (O 1 h ) cubic perovskite group by a small distortion along the (111) cubic directions. Its magnetic structure is a spiral-cycloidal incommensurate phase. Group theory analysis for the R3c ferroelectric group predicts 4A 1 ⊕ 5A 2 ⊕ 9E optical phonon modes [16]. The A 1 modes are infrared active along the c-axis, the E modes are infrared active on the ab-plane and the A 2 modes are silent. Early Raman data [12] found at least 11 modes at room temperature. Kamba et al. [16] proposed to fit the infrared data on ceramics using 13 Lorentz oscillators. Although these results found the proper number of modes, they cannot clarify the symmetry of the phonons. Some extra insight on the phonon assignment was obtained on more recent Raman data [13,14] but some inconsistencies in phonon assignment remain. In addition, Haumont et al. [12] argued that because the frequency of the lowest mode did not vanish smoothly at the Curie temperature, the ferroelectric transition in BiFeO 3 would not be soft-mode driven. This picture was later revised to propose that the incomplete phonon softening could rather be a sign of a first order transition [16,20]. However, both scenarios remain speculative.In this paper, we show the p...

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“…study including the origins of ferroelectric ordering and antiferromagnetic (AFM) ordering, the microscopic mechanisms of the anomalous dielectric constant, blueshift of the Mn d to d transition energy (E dd ), and the magnetoelectric (ME) effect near the Néel temperature (T N ) [1][2][3][4]. In particular, through temperature-dependent high-resolution neutron scattering experiments, the ME coupling in this family of multiferroics was further identified to involve a significant magneto-elastic effect [4].…”

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confidence: 99%

Epitaxial-Strain Effects on Electronic Structure and Magnetic Properties of Hexagonal YMnO3 Thin Films Studied by Femtosecond Spectroscopy

Chen

Hsieh

et al. 2012

J Supercond Nov Magn

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In this paper, (001)-oriented hexagonal YMnO 3 (h-YMO) thin films with various nominal strain states were deposited on MgO(100), MgO(111), and YSZ(111) substrates by pulsed laser deposition. The in-plane orientation alignment and substrate-induced epitaxial strain between the h-YMO films and substrates are examined by X-ray diffraction (XRD) θ -2θ , Φ, and ω scans. The effects of epitaxial strain on the on-site Mn d-d transition energy E dd (T ), and the Néel temperature (T N ) in these thin films are investigated by wavelength-tunable ultrafast pump-probe techniques. We find that the changes of E dd (T ) and T N depend on the type and magnitude of the epitaxial strain. The possible mechanisms for the observed strain effect on the electronic structure and associated magnetism are discussed.

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Exchange Interaction Effects on the Optical Properties ofLuMnO3

Cited by 134 publications

References 14 publications

Optical spectroscopic investigation on the coupling of electronic and magnetic structure in multiferroic hexagonalRMnO3(R=Gd, Tb, Dy, and Ho) t

Optical spectroscopic investigation on the coupling of electronic and magnetic structure in multiferroic hexagonalRMnO3(R=Gd, Tb, Dy, and Ho) t

Infrared phonon dynamics of a multiferroicBiFeO3single crystal

Epitaxial-Strain Effects on Electronic Structure and Magnetic Properties of Hexagonal YMnO3 Thin Films Studied by Femtosecond Spectroscopy

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