Wasp – Waisted loop and spin frustration in Dy2−xEuxTi2O7 pyrochlore

Singh, Pooja; Pal, Ajit; Gangwar, Vinod K.; Gupta, P. P.; Alam, Mohd; Ghosh, Surajit; Singh, Rahul; Ghosh, Anup K.; Chatterjee, Sandip

doi:10.1016/j.jmmm.2020.167364

Cited by 9 publications

(2 citation statements)

References 71 publications

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“…However, similar features in hysteresis have also been spotted among frustrated systems as well. There are several frustrated systems where chemical disorder in a system induces magnetic frustration, which is originated due to competition between negative and positive exchange coupling [91,92].…”

Section: Magnetic Hysteresismentioning

confidence: 99%

Investigation of crystal field, magnetic frustration and magnetization reversal effects in 4 f and 3d oxides

Kademane¹

2022

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This thesis deals with the investigation of single-ion excitations, magnetic frustration, and magnetization reversal phenomena. We have employed neutron scattering, µ+SR, and computational methods for these studies. Inverse spinel oxide Co2VO4 belongs to the family of spinel vanadates where cobalt and vanadium ions occupy the spinel B-site equally. This system exhibits magnetization reversal for temperatures below 65 K. Magnetization studies reveal three anomalies involving collinear and non-collinear ferrimagnetism phase and magnetization reversal crossover. Neutron diffraction analysis of Co2VO4 unveils that the evolution of relative balance between the two sublattice moments leads to ferrimagnetic phase and magnetization reversal. DFT calculation and µ+SR results suggest delocalization -localization crossover as the underlying microscopic mechanism for magnetization reversal. Rare earth oxide SrTm2O4 belongs to the family of SrLn2O4 where two inequivalent Tm3+ s form two zig-zag chains along the orthorhombic c-axis. An earlier study on SrTm2O4 reports the absence of long- or short-range order down to 65 mK. The crystal fields and exchange interactions in SrTm2O4 were studied to examine the absence of order. The crystal fields in SrTm2O4 were modeled using DFT and the effective charge (EC) model. The EC model describes the system well and suggests |l, ml) = |6, 0) dominates the ground state of both Tm + s. The exchange interactions extracted from low-energy dispersing excitations using random phase approximation suggest that Tm2 chains are frustrated and Tm1 chains could form dimers. The critical ratio calculated from exchange interaction indicates SrTm2O4 cannot undergo a thermal second-order phase transition confirming the absence of order. µ+SR results show oscillations in polarization evolution spectra; these are typically associated with muon precession due to the system’s long-range order. Modeling precession frequency vs. temperature reveals that these oscillations originate due to nuclear hyperfine enhancement. Additionally, the magnetic field application induces long-range order, with Tm2 function as polarized paramagnet whereas Tm1 above 4 T transitions into XY -AFM phase.

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Section: Magnetic Hysteresismentioning

confidence: 99%

Investigation of crystal field, magnetic frustration and magnetization reversal effects in 4 f and 3d oxides

Kademane¹

2022

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“…Furthermore, below 10 K, the hysteresis loop at the high field region became larger showed by a peak around 20 -30 kOe in ∆M(H). This behavior is expected to be due to the spin-flip caused by the coexistence of the AF and FM components [17,18]. With the appearance of the spin-flip phenomena, the hysteresis of the magnetization of Sample-II becomes 20 times bigger than that of Sample-I around 25 kOe.…”

mentioning

confidence: 99%

Optimizations of the Sintering Temperature to Reduce the Nd3RuO7 Phase and Investigations of their Effect on the Magnetic Properties in Nd2Ru2O7

Widyaiswari

Sakai

Hanasaki

et al. 2021

MSF

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One of the pyrochlore systems, Nd2Ru2O7, shows unique magnetic properties and can be a candidate of the electrocatalyst material for industrial applications. This system shows magnetic anomalies around 1.8 K, 21 K, and 146 K. The anomaly at 21 K is suggested to be coming from the impurity component of Nd3RuO7 and is still debatable. To investigate the effects of impurities on the magnetic properties of this sample, we synthesized some samples (labelled as Sample-I and II) using the solid-state reaction method with different heat treatment conditions and measured the magnetic susceptibility. We found that low sintering temperatures generated impurity phases of raw materials and Nd3RuO7. We also confirmed that those impurity phases were able to be reduced by optimizing heat treatment conditions. The optimum temperature for the sintering process should not be higher than 1000°C. The higher sintering temperatures yield more Nd3RuO7 impurity phases. Magnetic susceptibility measurements showed that samples with Nd3RuO7 impurity phases exhibited a peak around 21 K in the zero field-cooled condition accompanied by a broad peak around 12 K in the field-cooled condition indicating the appearance of Nd3RuO7.

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Investigations on structural and magnetic behavior of LaPrCo1-xFexMnO6 double perovskite system

Sharma,

Hooda,

Hooda

et al. 2024

J Sol-Gel Sci Technol

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Wasp – Waisted loop and spin frustration in Dy2−xEuxTi2O7 pyrochlore

Cited by 9 publications

References 71 publications

Investigation of crystal field, magnetic frustration and magnetization reversal effects in 4 f and 3d oxides

Investigation of crystal field, magnetic frustration and magnetization reversal effects in 4 f and 3d oxides

Optimizations of the Sintering Temperature to Reduce the Nd<sub>3</sub>RuO<sub>7 </sub>Phase and Investigations of their Effect on the Magnetic Properties in Nd<sub>2</sub>Ru<sub>2</sub>O<sub>7</sub>

Investigations on structural and magnetic behavior of LaPrCo1-xFexMnO6 double perovskite system

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