Infrared-active optical phonons in LiFePO4 single crystals

Stanislavchuk, T. N.; Middlemiss, Derek S.; Syzdek, Jarosław; Janssen, Y.; Basistyy, Roman; Sirenko, A. A.; Khalifah, Peter G.; Grey, Clare P.; Kostecki, Robert

doi:10.1063/1.4995282

Cited by 5 publications

(3 citation statements)

References 36 publications

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“…( 10) in Ref. [58], was assumed to be real and frequency-independent with components x = 8.1, y = 7.3 and z = 7.6 [59].…”

Section: Mean-field Modelmentioning

confidence: 99%

Refining magnetic interactions from the magnetic field dependence of spin-wave excitations in magnetoelectric LiFePO$_4$

Peedu¹,

Kocsis²,

Szaller³

et al. 2022

Preprint

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We investigated the spin excitations of magnetoelectric LiFePO4 by THz absorption spectroscopy in magnetic fields up to 33 T. By studying their selection rules, we found not only magnetic-dipole, but also electric-dipole active (electromagnons) and magnetoelectric resonances. The magnetic field dependence of four strong low-energy modes is reproduced well by our four-sublattice spin model for fields applied along the three orthorhombic axes. From the fit, we refined the exchange couplings, single-ion anisotropies, and the Dzyaloshinskii-Moriya interaction parameters. Additional spin excitations not described by the mean-field model are observed at higher frequencies. Some of them shows a strong shift with magnetic field, up to 4 cm −1 /T, when the field is applied along the easy axis. Based on this field dependence, we attribute these high frequency resonances to excitation of higher spin multipoles and of two magnons, which become THz-active due to the low symmetry of the magnetically ordered state.

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“…( 10) in Ref. [58], was assumed to be real and frequency-independent with components x = 8.1, y = 7.3 and z = 7.6 [59].…”

Section: Mean-field Modelmentioning

confidence: 99%

Refining magnetic interactions from the magnetic field dependence of spin-wave excitations in magnetoelectric LiFePO$_4$

Peedu¹,

Kocsis²,

Szaller³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…( 10) in Ref. [58], was assumed to be real and frequency-independent with components x = 8.1, y = 7.3, and z = 7.6 [60].…”

Section: Mean-field Modelmentioning

confidence: 99%

Terahertz spectroscopy of spin excitations in magnetoelectric LiFePO4 in high magnetic fields

et al. 2022

View full text Add to dashboard Cite

We investigated the spin excitations of magnetoelectric LiFePO 4 by THz absorption spectroscopy in magnetic fields up to 33 T. By studying their selection rules, we found not only magnetic-dipole, but also electric-dipole active (electromagnons) and magnetoelectric resonances. The magnetic field dependence of four strong lowenergy modes is reproduced well by a four-spin mean-field model for fields applied along the three orthorhombic axes. From the fit of magnetization and magnon frequencies, we refined the exchange couplings, single-ion anisotropies, and the Dzyaloshinskii-Moriya interaction parameters. Additional spin excitations not described by the mean-field model are observed at higher frequencies. Some of them show a strong shift with the magnetic field, up to 4 cm −1 T −1 , when the field is applied along the easy axis. Based on this field dependence, we attribute these high frequency resonances to the excitation of higher spin multipoles and of two magnons, which become THz-active due to the low symmetry of the magnetically ordered state.

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“…The traditional method of preparing β -eucryptite ceramics is the glass-forming technique. [13,14] This method includes preparation of molten materials, shaping, and recrystallization. Effects of the nucleating agent and crystallization behavior on the negative thermal expansion properties of the βeucryptite were investigated.…”

Section: Introductionmentioning

confidence: 99%

Properties of negative thermal expansion β -eucryptite ceramics prepared by spark plasma sintering

Zhao¹,

Cheng²,

Hao³

et al. 2018

Chinese Phys. B

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β -eucryptite powders are prepared by the sol-gel method through using tetraethoxysilane lithium nitrate and aluminum isopropoxide as starting materials. β -eucryptite ceramics are prepared by spark plasma sintering. The effects of sintering temperature on the negative thermal expansion properties of the β -eucryptite are investigated by x-ray diffraction (XRD), scanning electron microscopy, and thermal expansion test. The XRD results exhibit no change in the crystal structure of the sample prepared by different sintering processes. The negative thermal expansion properties increase with the increase of the sintering temperature. The coefficient of thermal expansion of β -eucryptite ceramics sintered at 1100 • C is calculated to be −4.93 × 10 −6 • C −1 . Crystallization behaviors of the ceramics may play an important role in the increase of negative thermal expansion of β -eucryptite. High sintering temperature could improve the crystallization behaviors of the ceramics and reduce the residue glass phase, which can improve the negative thermal expansion properties of β -eucryptite ceramics.

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Infrared-active optical phonons in LiFePO4 single crystals

Cited by 5 publications

References 36 publications

Refining magnetic interactions from the magnetic field dependence of spin-wave excitations in magnetoelectric LiFePO$_4$

Refining magnetic interactions from the magnetic field dependence of spin-wave excitations in magnetoelectric LiFePO$_4$

Terahertz spectroscopy of spin excitations in magnetoelectric LiFePO4 in high magnetic fields

Properties of negative thermal expansion β -eucryptite ceramics prepared by spark plasma sintering

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