Qasiferromagnetic behavior of a canted antiferromagnet-NdCrO3

Hornreich, R. M.; Komet, Y.; Nolan, R.; Yaeger, I.; Wanklyn, B. M.

doi:10.1063/1.30258

Cited by 9 publications

(14 citation statements)

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“…On the other hand, earlier reports differ on the aspect of Ho-ordering. Cooperatively induced ordering of Ho in HoCrO 3 was reported at 12 K [15,16] whereas no ordering was observed by Hornreich et.al., down to 1.5 K [17]. Ferroelectricity is observed in RCrO 3 systems only when the R ion is magnetic.…”

Section: Introductionmentioning

confidence: 94%

“…[38]. Based on optical absorption spectroscopy [30], magnetization and magnetic susceptibility [17], specific heat [39], elastic neutron diffraction [40] and inelastic neutron scattering (INS) [41] experiments five electronic Schottky levels were observed in HoCrO 3 with the fifth level being at ∼272 K (23.4 meV). To calculate C Schottky , a Schottky curve for five energy levels is used which contribute to C Schottky below 300 K. The ground state energy level is assumed to be zero i.e., ε 1 /k B = 0.…”

mentioning

confidence: 99%

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Hyperfine and crystal field interactions in multiferroic HoCrO₃

Kumar

Xiao

Nair

et al. 2016

J. Phys.: Condens. Matter

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Abstract. We report a comprehensive specific heat and inelastic neutron scattering study to explore the possible origin of multiferroicity in HoCrO 3 . We have performed specific heat measurements in the temperature range 100 mK-290 K and inelastic neutron scattering measurements were performed in the temperature range 1.5-200 K. From the specific heat data we determined hyperfine splitting at 22.5(2) µeV and crystal field transitions at 1.379(5) meV, 10.37(4) meV, 15.49(9) meV and 23.44(9) meV, indicating the existence of strong hyperfine and crystal field interactions in HoCrO 3 . Further, an effective hyperfine field is determined to be 600(3) T. The quasielastic scattering observed in the inelastic scattering data and a large linear term γ = 6.3(8) mJmol −1 K −2 in the specific heat is attributed to the presence of short range exchange interactions, which is understood to be contributing to the observed ferroelectricity. Further the nuclear and magnetic entropies were computed to be, ∼17.2 Jmol −1 K −1 and ∼34 Jmol −1 K −1 , respectively. The entropy values are in excellent agreement with the limiting theoretical values. An anomaly is observed in peak position of the temperature dependent crystal field spectra around 60 K, at the same temperature an anomaly in the pyroelectric current is reported. From this we could elucidate a direct correlation between the crystal electric field excitations of Ho 3+ and ferroelectricity in HoCrO 3 . Our present study along with recent reports confirm that HoCrO 3 , and RCrO 3 (R = Rare earth) in general, possess more than one driving force for the ferroelectricity and multiferroicity.

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Section: Introductionmentioning

confidence: 94%

mentioning

confidence: 99%

Hyperfine and crystal field interactions in multiferroic HoCrO₃

Kumar

Xiao

Nair

et al. 2016

J. Phys.: Condens. Matter

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“…The magnetic properties of HoCrO 3 have been studied by magnetization and neutron diffraction in the second half of the last century. The exchange coupling between nearest-neighbor Cr 3+ ions is predominantly antiferromagnetic and these ions order magnetically [19][20][21] below T N ≈ 142 K. Below this temperature HoCrO 3 exhibits weak ferromagnetic moment [21]. The magnetic structure of the Cr sublattice [21] is G z F x in the notation of Koehler et al [22] and Bertaut [23].…”

Section: Intrioductionmentioning

confidence: 99%

“…The exchange coupling between nearest-neighbor Cr 3+ ions is predominantly antiferromagnetic and these ions order magnetically [19][20][21] below T N ≈ 142 K. Below this temperature HoCrO 3 exhibits weak ferromagnetic moment [21]. The magnetic structure of the Cr sublattice [21] is G z F x in the notation of Koehler et al [22] and Bertaut [23]. At lower temperature Ho ions order and also due to strong interaction between Cr and Ho moments, spin canting phenomena take place [24][25][26].…”

Section: Intrioductionmentioning

confidence: 99%

Quasielastic and low-energy inelastic neutron scattering study of HoCrO₃by high resolution time-of-flight neutron spectroscopy

Chatterji

Demmel²,

Jalarvo

et al. 2017

J. Phys.: Condens. Matter

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n order to understand the origin of the huge quasielastic magnetic scattering observed previously with a back-scattering neutron spectrometer we have re-investigated the low energy excitations in HoCrO$_3$ by inelastic neutron scattering in a much wider energy range with time-of-flight neutron spectrometers. The inelastic signals are due to the excitations between the ground state doublet of the Ho ion. The quasielastic signal is due to the fluctuation of the disordered Ho moments. At low temperature the intensity of quasielastic scattering is small. It starts increasing as the temperature increases above 30 K. At the same temperature the elastic intensity due to Ho moment ordering decreases in a similar way. This observation strengthens the hypothesis that the quasielastic scattering is due the fluctuations of the disordered Ho moments. The time scale of fluctuations has been determine from the quasielastic scattering and was found to vary from about 22 ps at T = 70 K to about 2.5 ps at T = 160 K. The stretched exponential line shape indicates a distribution of decay rates at low temperatures.

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“…The anisotropy axes of the H0 3+ ions lie in the a-b plane at about ~6So from the a-axis, [14] and the g-value parallel to the anisotropy axis is 17.3 and that perpendicular to the anisotropy axis is negligibly small. [15] Therefore, the H0 3+ spins are strictly confined to these two anisotropy axes.…”

Section: -2 R' Band In Gdcr03mentioning

confidence: 99%

Cr3+ EXCITON MOTION IN RARE EARTH ORTHOCHROMITE RCrO3

Kojima

Tsujikawa

1987

J. Magn. Soc. Jpn.

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We have investigated the optical absorption spectra corresponding to the 4A2g~2Eg transition of Cr 3 + in various rare earth orthochromites RCr03.In the case that the R3+ ion is magnetic, an electric dipole band (R' band) was observed in the neighborhood of the Cr 3 + exciton lines. The R' bands were classified into three groups on the basis of their behaviors as follows: (1) The R' band in RCr03(R=Yb and Tm) are the combined excitation of a Cr 3 + exciton and a R3+ spin flip which is induced by the anisotropic parts of the Cr3+-R3+ exchange interaction.(2) The R' band in GdCr03 is the combined excitation of a Cr 3 + exciton and a R3+ spin flip which is induced by the isotropic part of the Cr 3 +-R3+ exchange interaction.(3) The R' band in RCr03(R=Er,Ho,Dy and Tb) is the localized Cr 3 + exciton which is caused by the R3+ spin fluctuation or by the static disorder of the R3+ spin configuration.From the analysis of the R' band, it was elucidated that the Cr 3 +-R3+ magnetic interaction plays an important role in the Cr 3 + exciton motion in RCr03.

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Qasiferromagnetic behavior of a canted antiferromagnet-NdCrO3

Cited by 9 publications

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Hyperfine and crystal field interactions in multiferroic HoCrO₃

Hyperfine and crystal field interactions in multiferroic HoCrO₃

Quasielastic and low-energy inelastic neutron scattering study of HoCrO₃by high resolution time-of-flight neutron spectroscopy

Cr3+ EXCITON MOTION IN RARE EARTH ORTHOCHROMITE RCrO3

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Qasiferromagnetic behavior of a canted antiferromagnet-NdCrO3

Cited by 9 publications

References 0 publications

Hyperfine and crystal field interactions in multiferroic HoCrO3

Hyperfine and crystal field interactions in multiferroic HoCrO3

Quasielastic and low-energy inelastic neutron scattering study of HoCrO3by high resolution time-of-flight neutron spectroscopy

Cr3+ EXCITON MOTION IN RARE EARTH ORTHOCHROMITE RCrO3

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Hyperfine and crystal field interactions in multiferroic HoCrO₃

Hyperfine and crystal field interactions in multiferroic HoCrO₃

Quasielastic and low-energy inelastic neutron scattering study of HoCrO₃by high resolution time-of-flight neutron spectroscopy