Magnetic properties of rare earth HoCrO3 chromites

Su, Yuling; Zhang, Jincang; Feng, Zhenjie; Li, Zijiong; Shen, Yan; Cao, Shixun

doi:10.1016/s1002-0721(10)60598-4

Cited by 48 publications

(21 citation statements)

References 28 publications

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“…Upon further decreasing temperature, the magnetization in ZFC and FCH shows a continuous increasing until a maximum value at T N2 in the ZFC curve, while the magnetization in FCC initially increases for a transient process and then decreases giving rise to a hump of positive magnetization at about 157 K (denoted as T max ) indicating the reversal of magnetization. This unusual "diamagnetism-like" behavior has also been reported by Prado-Gonjal et al 26 and Su et al 44 for HoCrO 3 orthochromite. The negative magnetization implies that the direction of resultant magnetic moment is opposite to that of the applied eld.…”

Section: Magnetic Properties Analysis-temperature Dependence Of the Msupporting

confidence: 82%

“…The negative magnetization implies that the direction of resultant magnetic moment is opposite to that of the applied eld. As proposed by Su et al, 44 this "diamagnetism-like" behavior may stem from the interaction between paramagnetic R 3+ moments and canted Cr 3+ moments, similar to the magnetization reversal mechanism. The same magnetization reversal behavior in GdCrO 3 has been reported by Jaiswal et al 7 and Yoshii.…”

Section: Magnetic Properties Analysis-temperature Dependence Of the Msupporting

confidence: 53%

“…Thereaer, it crosses the ZFC and FCH curves at T cross ¼ 145 K and then passes through zero at the rst compensation temperature of T comp1 ¼ 102 K. Below T comp1 , the magnetization keeps on decreasing to be negative and reaches a minimum value around T min ¼ 14 K before it increases again, which suggests the second reversal of magnetization. 26,44 Hence, this seemingly nonphysical phenomenon is less likely to be derived from the large negative remanent eld in the superconducting magnet of the SQUID magnetometer. Aer cooling down to a lower temperature, the FCC magnetization increases sharply crossing a zero value at the second compensation temperature of T comp2 ¼ 9.8 K and then gradually meets with the FCH curve.…”

Section: Magnetic Properties Analysis-temperature Dependence Of the Mmentioning

confidence: 99%

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General synthesis of rare-earth orthochromites with quasi-hollow nanostructures and their magnetic properties

et al. 2013

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Rare-earth orthochromites are extremely interesting because of their potential applications as multifunctional materials. However, it is still a great challenge for the general synthesis of nanostructured full rare-earth orthochromites series. Here, a facile and versatile solvothermal reduction strategy is successfully employed in the preparation of rare-earth chromites with quasi-hollow nanostructures. X-ray diffraction data show that all the products have the orthorhombic perovskite structure. The electron microscopy analysis reveals that the morphology of the product is seriously affected by the rare-earth ionic radius. Tube-like and vesicle-like structures can be formed for the larger and smaller rare-earth cationic radii, respectively. The experimental results suggest that the roomtemperature precursors of potassium rare-earth chromates serve as a self-template for the in situ reduction and formation of rare-earth orthochromites hollow structures. The magnetization studies demonstrate that all the products, as it would be expected, undergo a magnetic transition from paramagnetic to antiferromagnetic phase at the Néel temperature (T N1 ) attributed to Cr 3+ -Cr 3+ exchange and this critical temperature goes up linearly with an increase in the rare-earth ionic radius.Additionally, some samples exhibit a variety of fancy magnetic properties, including thermal hysteresis suggesting a first-order magnetic transition, magnetization reversal due to the antiparallel polarization of the R 3+ paramagnetic moments by the Cr 3+ canted antiferromagnetic ones, and magnetic exchange bias related to the spin reorientation transition of the Cr 3+ magnetic moments. † Electronic supplementary information (ESI) available: XRD patterns and SEM images of the typical room-temperature intermediates; TEM images of the typical 1200 C annealing sample; SEM images of LaCrO 3 , PrCrO 3 , NdCrO 3 and SmCrO 3 before and aer annealing; summary of the magnetic data based on the temperature dependence of the magnetization for all samples. See

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Section: Magnetic Properties Analysis-temperature Dependence Of the Msupporting

confidence: 82%

Section: Magnetic Properties Analysis-temperature Dependence Of the Msupporting

confidence: 53%

Section: Magnetic Properties Analysis-temperature Dependence Of the Mmentioning

confidence: 99%

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General synthesis of rare-earth orthochromites with quasi-hollow nanostructures and their magnetic properties

et al. 2013

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“…In a recent article, electrical polarization and magnetodielectric effect studies are reported for polycrystalline LuCrO 3 and ErCrO 3 [6]. Although both LuCrO 3 and ErCrO 3 showed the presence of a polar state induced by magnetic ordering below T N , polarization was not affected by applied magnetic fields, so that the magnetoelectric coupling was not evident in these compounds. Further, the magnetodielectric effect observed in the case of ErCrO 3 is one order of magnitude higher compared with LuCrO 3 reflecting the role of different magnetism of rare-earth cations in ferroelectricity [6].…”

Section: Introductionmentioning

confidence: 99%

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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“…The above approximation was based on the precondition that T/C H shows little dependence on the magnetic field as reported by Su et al [55]. The maximum △T ad is calculated using C H /T≈0.8 J/(mol K 2 ) at ~20 K for HCO.…”

Section: Magneto-caloric Propertiesmentioning

confidence: 97%

Magnetic and magnetocaloric properties of HoCrO3 tuned by selective rare-earth doping

et al. 2017

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Rare-earth chromites (RCrO 3 ) are an important sub-class of functional materials with interesting magnetic, electrical, and catalytic properties that make them promising for various applications. Here, we report comparisons on the structural and magnetic properties of ) ions at the A-site with ionic radius smaller (or larger) than that of Ho 3+ ion. The structural properties of the samples were characterized by X-ray diffraction, Raman spectroscopy, and scanning electron microscopy carried out at ambient. The band gaps of the three samples were determined by analyzing their UV-Vis spectra. Magnetic studies carried out from 5K to 300 K in magnetic fields up to 70 kOe show that the Néel temperature ( , where Cr 3+ ions order)increases with an increase in the average A-site (R-site) ionic radius, tolerance factor, and Cr1-O1-Cr1 bond angle, but decreases with an increase in the orthorhombic strain factor. In addition, the application of external hydrostatic pressure was found to enhance of HoCrO 3 , similar to the effect observed by doping HoCrO 3 with Gd 3+ ions. These changes in with A-site doping and hydrostatic pressure are related to changes in Cr 3+ -Cr 3+ exchange coupling resulting from changes in the Cr1-O1-Cr1 bond angle and Cr1-O1 bond lengths respectively. Temperature dependent paramagnetic susceptibility data of the samples was fitted to the modified CurieWeiss law that included the Dzyloshinskii-Moriya interaction. Isothermal magnetization data showed that the magnetic behavior of the samples changes from canted antiferromagnetism at low temperatures to paramagnetism at higher temperatures. The large magneto-caloric entropy change was observed in HoCrO 3 which was enhanced by Gd doping but lowered by Tm doping showing its tunability by A-site doping. Correlation between magneto-electric properties and magnetization is discussed.2

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Magnetic properties of rare earth HoCrO3 chromites

Cited by 48 publications

References 28 publications

General synthesis of rare-earth orthochromites with quasi-hollow nanostructures and their magnetic properties

General synthesis of rare-earth orthochromites with quasi-hollow nanostructures and their magnetic properties

Hyperfine and crystal field interactions in multiferroic HoCrO₃

Magnetic and magnetocaloric properties of HoCrO3 tuned by selective rare-earth doping

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Magnetic properties of rare earth HoCrO3 chromites

Cited by 48 publications

References 28 publications

General synthesis of rare-earth orthochromites with quasi-hollow nanostructures and their magnetic properties

General synthesis of rare-earth orthochromites with quasi-hollow nanostructures and their magnetic properties

Hyperfine and crystal field interactions in multiferroic HoCrO3

Magnetic and magnetocaloric properties of HoCrO3 tuned by selective rare-earth doping

Contact Info

Product

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Hyperfine and crystal field interactions in multiferroic HoCrO₃