Optical-absorption spectra of crystal-field transitions in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">MnPS</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>at low temperatures

Grasso, V.; Neri, F.; Perillo, P.; Silipigni, L.; Piacentini, M.

doi:10.1103/physrevb.44.11060

Cited by 38 publications

(25 citation statements)

References 20 publications

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“…The SHG-RA experiments were performed with a Ti:Sapph oscillator delivering laser pulses with a photon energy of ω = 1.5 eV, a pulse width of 80 fs, and a repetition rate of 80 MHz. The SHG photons produced at 3 eV are resonant with the band gap of MnPS 3 [23]. A 5× (50×) microscope objective was used to focus light onto the bulk (exfoliated) samples at normal incidence with a spot size of approximately 30 µm (2 µm), and the intensity of the reflected SHG beam was measured using a photomultiplier tube.…”

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confidence: 99%

Linear Magnetoelectric Phase in Ultrathin MnPS3 Probed by Optical Second Harmonic Generation

et al. 2020

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The transition metal thiophosphates M PS3 (M = Mn, Fe, Ni) are a class of van der Waals stacked insulating antiferromagnets that can be exfoliated down to the ultrathin limit. MnPS3 is particularly interesting because its Néel ordered state breaks both spatial-inversion and timereversal symmetries, allowing for a linear magneto-electric phase that is rare among van der Waals materials. However, it is unknown whether this unique magnetic structure of bulk MnPS3 remains stable in the ultrathin limit. Using optical second harmonic generation rotational anisotropy, we show that long-range linear magneto-electric type Néel order in MnPS3 persists down to at least 5.3 nm thickness. However an unusual mirror symmetry breaking develops in ultrathin samples on SiO2 substrates that is absent in bulk materials, which is likely related to substrate induced strain.

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confidence: 99%

Linear Magnetoelectric Phase in Ultrathin MnPS3 Probed by Optical Second Harmonic Generation

et al. 2020

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“…MnPS 3 undergoes antiferromagnetic ordering below 78 K and showed a spin-flop phase at high magnetic fields 45 . Grasso et al have identified the 1.92, 2.40, and 2.64 eV absorption peaks in MnPS 3 as the optical transitions from 6 A 1g ground state to the spin-forbidden 4 T 1g ( 4 G), 4 T 2g ( 4 G), and the degenerate { 4 E g , 4 A 1g } states respectively 46 . Room temperature fluorescence excitation spectra of MnPS 3 reported by Grasso et al, revealed that the 6 A 1g → 4 E g ( 4 D) transition will be exhibited at 3.13 eV 47 .…”

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confidence: 99%

“…The energy of the excited states relative to the ground state can be expressed in terms of 10Dq and the Racah B and C parameters as 39,46 ,…”

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confidence: 99%

Electronic structure and magnetic symmetry in MnTiO3analyzed by second harmonic generation

et al. 2013

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Second harmonic generation (SHG) and linear absorbance spectra of MnTiO3 were measured and the 1.88, 2.41, 2.63, and 3.06 eV SHG features were identified as d-d optical transitions from 6 A1g to 4 T1g( 4 G), 4 T2g( 4 G), { 4 Eg, 4 A1g( 4 G)}, and 4 Eg( 4 D) respectively. These zero-phonon transitions were used to calculate the octahedral crystal field splitting energy (∆0) and the Racah parameters B and C. The SHG spectra showed significant distinctions between the antiferromagnetic and the paramagnetic or spin-flop phases. The polarization dependence of the SHG in the spin-flop phase provided optical evidence that the spins canted from the c-axis toward the a-axis. These distinctions between the three magnetic phases could be useful for mapping 180 • antiferromagnetic domains in MnTiO3.2

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“…In Ni 2 P 2 S 6 and Mn 2 P 2 S 6 there exist no conduction electrons, no structural transition is present that could conceivably modify the hyperfine coupling, and the lowest energy crystal field transition from the ground state 6 A 1g to the first excited state 4 T 1g is 1.92 eV [53]. Therefore, another effect must be responsible for the K-χ anomaly.…”

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confidence: 99%

${}^{31}$P NMR investigation of quasi-two-dimensional magnetic correlations in $T_2$P$_2$S$_6$ ($T$ = Mn & Ni)

Bougamha,

Selter,

Shemerliuk

et al. 2021

Preprint

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We report the anomalous breakdown in the scaling of the microscopic magnetic susceptibilityas measured via the 31 P nuclear magnetic resonance (NMR) shift K-with the bulk magnetic susceptibility χ in the paramagnetic state of Mn2P2S6. This anomaly occurs near Tmax ∼ 117 K the maximum in χ(T ) and is therefore associated with the onset of quasi-two-dimensional (quasi-2D) magnetic correlations. The spin-lattice relaxation rate divided by temperature (T1T ) −1 in Mn2P2S6 exhibits broad peak-like behavior as a function of temperature, qualitatively following χ, but displaying no evidence of critical slowing down above the Néel temperature TN . In the magnetic state of Mn2P2S6, NMR spectra provide good evidence for 60 degree rotation of stackingfault-induced magnetic domains, as well as observation of the spin-flop transition that onsets at 4 T. The temperature-dependent critical behavior of the internal hyperfine field at the P site in Mn2P2S6 is consistent with previous measurements and the two-dimensional anisotropic Heisenberg model. In a sample of Ni2P2S6, we observe only two magnetically split resonances in the magnetic state, demonstrating that the multiple-peaked NMR spectra previously associated with 60 degree rotation of stacking faults is sample dependent. Finally, we report the observation of a spin-flop-induced splitting of the NMR spectra in Ni2P2S6, with an onset spin-flop field of H sf = 14 T.

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Optical-absorption spectra of crystal-field transitions inMnPS3at low temperatures

Cited by 38 publications

References 20 publications

Linear Magnetoelectric Phase in Ultrathin MnPS3 Probed by Optical Second Harmonic Generation

Linear Magnetoelectric Phase in Ultrathin MnPS3 Probed by Optical Second Harmonic Generation

Electronic structure and magnetic symmetry in MnTiO3analyzed by second harmonic generation

${}^{31}$P NMR investigation of quasi-two-dimensional magnetic correlations in $T_2$P$_2$S$_6$ ($T$ = Mn & Ni)

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