Negative magnetization in the zero field-cooled and exchange-bias effect in Cu-doped PrCrO3

Mendivil, L. F.; Alvarado-Rivera, J.; Tavizón, Gustavo; Verdín, E.; Arenas-Alatorre, J.; Durán, A.

doi:10.1007/s10854-021-06926-y

Cited by 6 publications

(3 citation statements)

References 59 publications

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“…The dM/dT data distinctly show a sharp drop below ∼5.6 K, and a clear change in the curvature of M(T) at T * in the temperature range of 22 K to 5.6 K. This weak hump in M(T) could be associated with the magnetic degree of freedom, which leads to a significant deviation in magnetic susceptibility from the Curie-Weiss behavior at low temperature (see figure 4(c)). It is interesting to note that a similar type of weak hump in magnetization data has been seen for other Pr based perovskites PrBO 3 (B = transition metals) at low temperature where the rare-earth spins order in an AFM arrangement [26][27][28][29]. The continuous increase in magnetization below T * could be associated with a minor paramagnetic (PM) impurity phase consisting of noninteracting and isolated Pr or Ir moments.…”

Section: Magnetization Studysupporting

confidence: 54%

“…4 (c)]. It is interesting to note that a similar type of weak hump in magnetization data has been seen for other Pr based perovskites PrBO 3 (B = transition metals) at low temperature where the rare-earth spins order in an AFM arrangement [27,28,29,30]. The continuous increase in magnetization below T * could be associated with a minor paramagnetic (PM) impurity phase consisting of non-interacting and isolated Pr or Ir moments.…”

Section: Magnetization Studymentioning

confidence: 57%

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Fluorite-related iridate Pr₃IrO₇: crystal growth, structure, magnetism, thermodynamic, and optical properties

Kumar¹,

Köpf²,

A.³

et al. 2022

J. Phys.: Condens. Matter

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Spin-orbit coupling in heavy 5$d$ metal oxides, in particular, iridates have received tremendous interest in recent years due to the realization of exotic electronic and magnetic phases. Here, we report the synthesis, structural, magnetic, thermodynamic, and optical properties of the ternary iridate Pr$_3$IrO$_7$. Single crystals of Pr$_3$IrO$_7$ have been grown by the KF flux method. Structural analysis shows that Pr$_3$IrO$_7$ crystallizes in an orthorhombic phase with $Cmcm$ symmetry. The electron energy loss spectroscopy study indicates that Pr is in a 3+ valence state, which implies a 5+ oxidation state of Ir. Magnetization data measured at high and low magnetic fields do not exhibit any bifurcation between $M_{ZFC}$ and $M_{FC}$, however, a weak hump in $M(T)$ is observed at $T^*$$\sim$10.4~K. The specific heat data reveal two maxima at $\sim$253 K and $\sim$4.8 K. The optical conductivity $\sigma_1(\omega)$ spectrum shows 26 infrared-active phonon modes and reveals an insulating behavior with an optical gap $\Delta_{OP}$ of size $\sim$500~meV. During cooling down, the temperature-dependent reflectivity spectrum reveals seven extra phonon modes below the structural phase transition ($\sim$ 253 K). An anomaly is observed at around $T^*$ in the temperature evolution of infrared-active mode frequencies suggesting the presence of significant spin-phonon coupling in the system.

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Section: Magnetization Studysupporting

confidence: 54%

Section: Magnetization Studymentioning

confidence: 57%

Fluorite-related iridate Pr₃IrO₇: crystal growth, structure, magnetism, thermodynamic, and optical properties

Kumar¹,

Köpf²,

A.³

et al. 2022

J. Phys.: Condens. Matter

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“…The negative magnetization occurs in Γ 2 state within the 100 K to 223 K T-range, where the G z spin component aligns opposite to the applied field. The negative magnetization with diamagnetism-like characteristics is observed for the ZFC condition under low fields in polycrystalline HoCrO 3 and PrCr (1−x) Cu x O 3 orthochromite [43,44]. However, these reports do not show any negative susceptibility to distinguish diamagnetism.…”

Section: Magnetic Characterizationmentioning

confidence: 99%

Exploration of low field magnetic states in Nd 1−x Ce_xCrO₃

Gupta

Pal

2023

J. Phys.: Condens. Matter

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We report the structural and magnetic properties of Nd1-xCexCrO3 (x = 0.05-0.175) single-phase samples to classify the influence of Ce substitution on the Nd-site. The electron density profile indicates the possible covalent nature of Cr-O bonds. The X-ray photoelectron spectroscopy (XPS) confirms a mixed Ce valency with a constant ratio of Ce3+/Ce4+ ions in all substituted compounds and the charge neutralization through the oxygen vacancies. The magnetization measurements reveal an increase in antiferromagnetic ordering temperature (T N) and spin-reorientation transition temperature (T SR) and unfold soft spin-reorientation attributed to diluted superexchange interactions upon Ce incorporation. The presence of mixed Ce ions induces the merging of the hysteresis loop with a significant exchange bias (EB) field. We demonstrate for the first time that the magnitude of the magnetization is different for the same applied field in positive and negative directions, indicating the existence of two different magnetic states. The difference between these two magnetic states possibly arises from the pinning of Cr3+ spins, which requires an additional Zeeman energy for it to rotate. This maximum Zeeman energy from the normalized magnetic susceptibility vs. temperature curves correlates with the maximum EB field, validating unusual EB in these compounds.

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Negative magnetization in the medium-entropy Pr1/3Dy1/3Ho1/3CrO3 and PrCrO3 ceramics: comparative crystal structure, optic, dielectric and magnetic properties

Durán,

Reguera,

Mendivil

et al. 2023

J Mater Sci

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In recent years, raising investigation activity in entropy-stabilized ceramic oxides has been driven by their innovative approach to designing a thermodynamically stable multi-element system, which provides a new focus on investigating complex functional materials. Especially, complex and singular physical properties of orthochromite have generated rising research in recent years. Of this family, the PrCrO3, DyCrO3, and HoCrO3 systems are particularly interesting since, below Néel temperature (TN), they present negative magnetization in the ZFC mode. Here, we have employed this approach and designed a medium-entropy (MECs) Pr1/3Dy1/3Ho1/3CrO3 (PDH) ceramic to study not only whether the magnetic characteristics prevail, but also the state of optical and dielectric properties of this new compound. In addition, the physical properties studied were compared with the single PrCrO3 (PC) compound. These compounds were synthesized through a facile combustion synthesis route. The X-ray diffraction analysis, energy-dispersive X-ray spectroscopy (EDS), and surface scanning elemental mapping reveal that a single phase is stabilized and equimolar cations are homogeneously distributed in the PDH-MECs. We found that the disorder of cations in the A-site of the structure has no significant effect on the optical transition in the visible electromagnetic region and dielectric properties with respect to the simple compound PC. In contrast, the magnetic properties are strongly affected in the MECs-PDH compound. We found that the TN is tuned through the O–Cr–O angles and below the antiferromagnetic transition. The results suggest that the negative magnetization in the ZFC mode is an intrinsic feature in these compounds since the negative ZFC susceptibility below TN predominates despite the cationic disorder. Furthermore, their negative magnetic mechanism in both the MECs-PDH and PC compounds are discussed in terms of the Γ2(FxCyGz) magnetic configuration. Graphical abstract

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Negative magnetization in the zero field-cooled and exchange-bias effect in Cu-doped PrCrO3

Cited by 6 publications

References 59 publications

Fluorite-related iridate Pr₃IrO₇: crystal growth, structure, magnetism, thermodynamic, and optical properties

Fluorite-related iridate Pr₃IrO₇: crystal growth, structure, magnetism, thermodynamic, and optical properties

Exploration of low field magnetic states in Nd 1−x Ce_xCrO₃

Negative magnetization in the medium-entropy Pr1/3Dy1/3Ho1/3CrO3 and PrCrO3 ceramics: comparative crystal structure, optic, dielectric and magnetic properties

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Negative magnetization in the zero field-cooled and exchange-bias effect in Cu-doped PrCrO3

Cited by 6 publications

References 59 publications

Fluorite-related iridate Pr3IrO7: crystal growth, structure, magnetism, thermodynamic, and optical properties

Fluorite-related iridate Pr3IrO7: crystal growth, structure, magnetism, thermodynamic, and optical properties

Exploration of low field magnetic states in Nd 1−x Ce x CrO3

Negative magnetization in the medium-entropy Pr1/3Dy1/3Ho1/3CrO3 and PrCrO3 ceramics: comparative crystal structure, optic, dielectric and magnetic properties

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Product

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Fluorite-related iridate Pr₃IrO₇: crystal growth, structure, magnetism, thermodynamic, and optical properties

Fluorite-related iridate Pr₃IrO₇: crystal growth, structure, magnetism, thermodynamic, and optical properties

Exploration of low field magnetic states in Nd 1−x Ce_xCrO₃