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Manna, Kaustuv; Bera, A. K.; Jain, Manish; Elizabeth, Suja; Yusuf, S. M.; Kumar, P. S. Anil

doi:10.1103/physrevb.91.224420

Cited by 35 publications

(21 citation statements)

References 44 publications

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“…Such a reduced moment is typically observed in low-dimensional and frustrated spin systems which is attributed to the effect of quantum fluctuations and magnetic frustration, respectively. [38] As shown in the inset of Fig. 8 the value of the ordered moment for both Ni 2+ and Mn 4+ decreases as the temperature approaches T C , typical behaviour of sub-lattice magnetization in the ordered state.…”

Section: E Neutron Diffractionmentioning

confidence: 81%

“…Similar behaviour is also reported for reentrant SG compound Lu 2 MnNiO 6 and it is mentioned that the unusual behaviour where memory exists above T f and below T C can be attributed to the effect of magnetic frustration due to competing FM and AFM interactions. [38] A FCC curve, M ref FCC in the same field without any interruption is also measured as a reference.…”

Section: Memmentioning

confidence: 99%

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Unconventional superparamagnetic behavior in the modified cubic spinel compound LiNi$_{0.5}$Mn$_{1.5}$O$_{4}$

Islam,

Singh,

Somesh

et al. 2020

Preprint

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Structural, electronic, and magnetic properties of modified cubic spinel compound LiNi0.5Mn1.5O4 are studied via x-ray diffraction, resistivity, DC and AC magnetization, heat capacity, neutron diffraction, 7 Li nuclear magnetic resonance, magnetocaloric effect, magnetic relaxation, and magnetic memory effect experiments. We stabilized this compound in a cubic structure with space group P 4332. It exhibits semiconducting character with an electronic band gap of ∆/kB 0.4 eV. The interaction within each Mn 4+ and Ni 2+ sub-lattice and between Mn 4+ and Ni 2+ sublattices is found to be ferromagnetic (FM) and antiferromagnetic (AFM), respectively. This leads to the onset of a ferrimagnetic transition at TC 125 K. The reduced values of frustration parameter (f ) and ordered moments reflect magnetic frustration due to competing FM and AFM interactions. From the 7 Li NMR shift vs susceptibility plot, the average hyperfine coupling between 7 Li nuclei and Ni 2+ and Mn 4+ spins is calculated to be ∼ 672.4 Oe/µB. A detailed critical behaviour study is done in the vicinity of TC using modified-Arrott plot, Kouvel-Fisher plot, and universal scaling of magnetization isotherms. The magnetic phase transition is found to be second order in nature and the estimated critical exponents correspond to the 3D XY universality class. A large magneto-caloric effect is observed with a maximum value of isothermal change in entropy ∆Sm −11.3 J/Kg-K and a maximum relative cooling power of RCP 604 J/Kg for 9 T magnetic field change. The imaginary part of the AC susceptibility depicts a strong frequency dependent hump at T = T f2 well below the blocking temperature T b 120 K. The Arrhenius behaviour of frequency dependent T f2 and the absence of ZFC memory confirm the existence of superparamagnetism in the ferrimagnetically ordered state.

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Section: E Neutron Diffractionmentioning

confidence: 81%

Section: Memmentioning

confidence: 99%

Unconventional superparamagnetic behavior in the modified cubic spinel compound LiNi$_{0.5}$Mn$_{1.5}$O$_{4}$

Islam,

Singh,

Somesh

et al. 2020

Preprint

Self Cite

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“…All Fe-substituted samples clearly show bifurcation between FC and ZFC M(T) data. The bifurcation occurs at compositionspecific irreversibility temperatures (T irr ), which move to lower temperatures with increasing H. The peak temperatures (T p ), at which the maxima of the ZFC data are observed, also move to lower temperatures with increasing H. Such features in M(T) curves along with the thermomagnetic irreversibility often arise in ferromagnets exhibiting domain wall relaxation [16], in clustered spin glass-based systems [17,18], phase separated [19] and super-paramagnetic materials [20].…”

Section: Magnetizationmentioning

confidence: 97%

From a conventional ferromagnetism to a frustrated magnetism: An unexpected role of Fe in Nd(Al1-xFex)2 (x ≤ 0.2)

Mudryk

Biswas

et al. 2020

Journal of Alloys and Compounds

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The structure and magnetic properties of Nd(Al 1-x Fe x ) 2 alloys with x = 0, 0.05, 0.1 and 0.2, which adopt cubic MgCu 2 -type structure with space group Fd3 � m, are studied using x-ray powder diffraction, static and dynamic magnetization, and calorimetric measurements. The lattice constant decreases linearly with increasing Fe content from 8.0106(4) Å to 7.9044(4) Å. Large thermal irreversibilities between zero-fieldcooled and field-cooled conditions are observed for all substituted samples. The magnetic transition temperatures exhibit a minimum for x = 0.1, and coercive fields at 2 K increase from 70 Oe for x = 0 to 6.3 kOe for x = 0.2. The absence of λ-type peak in the heat capacity data, frequency dependence of ac magnetic susceptibility, and memory effects indicate formation of a cluster-glass magnetic state when x ≥ 0.1.

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“…Instead, our neutron diffraction data and the comparison between the ordered and disordered samples allow us to conclude that the spin glass behaviour is likely to be related to the clustering of AS defects and the associated short range magnetic ordering. reduced ordered magnetic moment has also been found in slightly disordered double perovskite Lu2NiMnO6 [42] and heavily disordered Sr2FeMoO6 with only 18% of the cation ordering [24]. The magnetization of the nominally disordered Tl2NiMnO6 sample is substantially smaller than that of the ordered one and does not vary linearly even in high magnetic fields, which is typical for spin glasses.…”

Section: Magnetic Propertiesmentioning

confidence: 97%

Colossal magnetoresistance in the insulating ferromagnetic double perovskites Tl2NiMnO6: A neutron diffraction study

et al. 2019

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In the family of double perovskites, colossal magnetoresistance (CMR) has been so far observed only in half-metallic ferrimagnets such as the known case Sr2FeMoO6 where it has been assigned to the tunneling MR at grain boundaries due to the half-metallic nature. Here we report a new material−Tl2NiMnO6, a relatively ordered double perovskite stablized by the high pressure and high temperature synthesis−showing CMR in the vicinity of its Curie temperature. We explain the origin of such effect with neutron diffraction experiment and electronic structure calculations that reveal the material is a ferromagnetic insulator. Hence the ordered Tl2NiMnO6 (~70% of Ni 2+ /Mn 4+ cation ordering) represents the first realization of a ferromagnetic insulating double perovskite, showing CMR. The study of the relationship between structure and magnetic properties allows us to clarify the nature of spin glass behaviour in the disordered Tl2NiMnO6 (~31% of cation ordering), which is related to the clustering of antisite defects and associated with the short-range spin correlations. Our results (L. Ding) † alexei.belik@nims.go.jp (A. A. Belik) highlight the key role of the cation ordering in establishing the long range magnetic ground state and lay out new avenues to exploit advanced magnetic materials in double perovskites. IntroductionPerovskites, a fertile playground for the study of strong interplay between spin, orbital and charge degrees of freedom, can accommodate a large variety of cation species due to their flexible crystal structure, giving rise to diverse and fascinating electronic and magnetic properties [1-7]. In ordered double perovskites, with chemical formula A2BB'O6 (A= rare earth or alkaline, B/B'= transition metal), B and B' cations generally form either rock-salt or layered type superstructure. The former, which leads to alternate stacking of BO6/B'O6 octahedra, is the most common type to minimize the electrostatic energy arising from the different charges of the two cations, and/or the elastic energy due to their different ionic sizes [8-16]. When the radius or the charge of B and B' cations is similar, the probability of antisite (AS) defects (partial occupation of B cations in B' sites and vice versa) increases up to a fully disordered state, effectively tuning the macroscopic properties of the system [11].One of the most intriguing properties of double perovskites is the colossal magnetoresistance (CMR), typically arising from the half-metallic nature of their electronic structures [17][18][19]. For example, half-metallic Sr2FeMoO6 shows a CMR in low magnetic field associated with a ferrimagnetic order above room temperature, providing a promising system for technological applications [17].

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Structural-modulation-driven spin canting and reentrant glassy magnetic phase in ferromagneticLu2MnNiO6

Cited by 35 publications

References 44 publications

Unconventional superparamagnetic behavior in the modified cubic spinel compound LiNi$_{0.5}$Mn$_{1.5}$O$_{4}$

Unconventional superparamagnetic behavior in the modified cubic spinel compound LiNi$_{0.5}$Mn$_{1.5}$O$_{4}$

From a conventional ferromagnetism to a frustrated magnetism: An unexpected role of Fe in Nd(Al1-xFex)2 (x ≤ 0.2)

Colossal magnetoresistance in the insulating ferromagnetic double perovskites Tl2NiMnO6: A neutron diffraction study

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