Temperature dependence of magnetic excitations in the frustrated antiferromagnetic spinel 
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Chang, Hun Soo; Hwang, In Yong; Chung, Jaiho; Stewart, J. R.; Higemoto, Wataru; Miyake, Yasuhiro

doi:10.1103/physrevb.97.014406

Cited by 10 publications

(9 citation statements)

References 33 publications

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“…Such situation is often observed in μ + SR spectra recorded in ZF for materials with very large magnetic moments, for instance, ferro-/ferrimagnetic materials. 38 − 40 Because the magnetic moments of each magnetic site in MgFeMnO 4 are maximum ∼1.6 μ B , such a scenario is very reasonable. Hence, this is also in perfect agreement with the current NPD results that reveal a collinear ferrimagnetic ordering.…”

Section: Resultsmentioning

confidence: 98%

Cation Distributions and Magnetic Properties of Ferrispinel MgFeMnO₄

et al. 2020

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The crystal structure and magnetic properties of the cubic spinel MgFeMnO 4 were studied by using a series of in-house techniques along with large-scale neutron diffraction and muon spin rotation spectroscopy in the temperature range between 1.5 and 500 K. The detailed crystal structure is successfully refined by using a cubic spinel structure described by the space group Fd 3̅ m . Cations within tetrahedral A and octahedral B sites of the spinel were found to be in a disordered state. The extracted fractional site occupancies confirm the presence of antisite defects, which are of importance for the electrochemical performance of MgFeMnO 4 and related battery materials. Neutron diffraction and muon spin spectroscopy reveal a ferrimagnetic order below T C = 394.2 K, having a collinear spin arrangement with antiparallel spins at the A and B sites, respectively. Our findings provide new and improved understanding of the fundamental properties of the ferrispinel materials and of their potential applications within future spintronics and battery devices.

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Section: Resultsmentioning

confidence: 98%

Cation Distributions and Magnetic Properties of Ferrispinel MgFeMnO₄

et al. 2020

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“…As evident in the x-ray pattern (figure 1) collected at RT (295 K), this compound exhibits the tetragonal spinel structure with lattice parameters a = 5.8390 (7) Å and c = 8.8156 (14) Å giving a c/a√2 ratio of 1.0676 (3). For comparison, the parameter a = 8.52 Å was found for cubic ZnFe 2 O 4 [10], and a = 5.72 Å and c = 9.245 Å has been reported for tetragonal ZnMn 2 O 4 giving a c/a√2 ratio of 1.143 [20]. The elongation along the c direction results from the presence of JT active Mn 3+ ions.…”

Section: Structural and Elemental Informationmentioning

confidence: 92%

“…In contrast to the cubic spinel ZnFe 2 O 4 , ZnMn 2 O 4 is a tetragonal spinel because of the presence of the Jahn-Teller (JT) active Mn 3+ ions on the B site [19,20] and specific heat C p vs. T data in this system show a magnetic transition at T N ≃ 63 K. ND and µSR measurements in this system for T < T N show 2D correlations with full development of ordered magnetic moment due to single-ion anisotropy [19,20].…”

Section: Introductionmentioning

confidence: 99%

Spin-liquid state with precursor ferromagnetic clusters interacting antiferromagnetically in frustrated glassy tetragonal spinel Zn_0.8Cu_0.2FeMnO₄

Jena

Seehra

Sarkar

et al. 2023

J. Phys.: Condens. Matter

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Spinels (AB2O4) with magnetic ions occupying only the octahedral B sites have inherent magnetic frustration which inhibits long-range magnetic order (LRO) but may lead to exotic states. Here we report on the magnetic properties of the tetragonal spinel Zn0.8Cu0.2FeMnO4, the tetragonality resulting from Jahn-Teller active Mn3+ ions. Analysis of the temperature dependence of magnetization (M), heat capacity Cp, and neutron diffraction measurements show complex temperature-dependent short-range ordering (SRO) but without LRO with spin arrangement (Cu2+ ↓)A[Fe2+ ↑, Fe3+ ↓, Mn3+ ↑]B leading to FM clusters interact antiferromagnetically (AFM) at low-T. The relaxation time τ obtained from the Power law and Vogel-Fulcher laws confirm the cluster spin-glass state. The field dependence of spin-glass temperature TSG (H) follows the equation: TSG (H)=TSG(0)[1-AH(2/ϕ) ] with TSG (0) = 46.6 K, A = 8.6 ×10‒3 Oe‒0.593 and ϕ = 3.37. The temperature dependence of hysteresis loops yields coercivity HC ~ 3.8 kOe at 2 K without exchange-bias but HC decreases with increase in T and vanishes at 24 K, the TSG(H) for H = 800 Oe. Variations of Cp-T from 2 K to 200 K in H = 0 and H = 90 kOe do not show any peak characteristic of LRO. However, after correcting for the lattice contribution, a broad transition typically of SRO becomes evident at 40 K. For T < 9 K, Cp varies as T2; a typical signature of spin-liquids. Comparison of the neutron diffraction measurements at 1.7 K and 79.4 K shows absence of LRO. Time dependence of thermoremanent magnetization studies below 9 K reveal weakening of the inter-cluster interaction with increase in temperature. A summary of these results is that in Zn0.8Cu0.2FeMnO4, ferromagnetic clusters interact antiferromagnetically without LRO but producing a cluster spin-glass state at TSG(0) = 46.6 K, followed by spin-liquid behavior below 9 K.

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“…Such situation is often observed in ZF-signals for either systems with very large magnetic moments and/or ferro/ferrimagnetic materials. [32][33][34] Since the magnetic moments of each magnetic site of MgFeMnO 4 are maximum ⇠ 1.6 µ B , the latter scenario is more reasonable. This is in perfect agreement with the current NPD results that reveal a collinear ferrimagnetic ordering.…”

Section: Muon Spin Relaxation (µ + Sr)mentioning

confidence: 99%

Cation Distributions and Magnetic Properties of Ferrispinel MgFeMnO4

Matsubara

Masese

Suard

et al. 2020

Preprint

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The research deals with spinel compounds MgFeMnO4, which is known as a cathode material of magnesium battery. It exhibits a cationic disordering in cubic spinel structure and ferrimagnetism at room-temperature. The experimental data is acquired using a combination of magnetization, Mössbauer spectroscopy measurements, powder diffractions and muon spin rotation, relaxation and resonance (μ+SR) techniques.

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Temperature dependence of magnetic excitations in the frustrated antiferromagnetic spinel ZnMn2O4

Cited by 10 publications

References 33 publications

Cation Distributions and Magnetic Properties of Ferrispinel MgFeMnO₄

Cation Distributions and Magnetic Properties of Ferrispinel MgFeMnO₄

Spin-liquid state with precursor ferromagnetic clusters interacting antiferromagnetically in frustrated glassy tetragonal spinel Zn_0.8Cu_0.2FeMnO₄

Cation Distributions and Magnetic Properties of Ferrispinel MgFeMnO4

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Temperature dependence of magnetic excitations in the frustrated antiferromagnetic spinel ZnMn2O4

Cited by 10 publications

References 33 publications

Cation Distributions and Magnetic Properties of Ferrispinel MgFeMnO4

Cation Distributions and Magnetic Properties of Ferrispinel MgFeMnO4

Spin-liquid state with precursor ferromagnetic clusters interacting antiferromagnetically in frustrated glassy tetragonal spinel Zn0.8Cu0.2FeMnO4

Cation Distributions and Magnetic Properties of Ferrispinel MgFeMnO4

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Product

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Cation Distributions and Magnetic Properties of Ferrispinel MgFeMnO₄

Cation Distributions and Magnetic Properties of Ferrispinel MgFeMnO₄

Spin-liquid state with precursor ferromagnetic clusters interacting antiferromagnetically in frustrated glassy tetragonal spinel Zn_0.8Cu_0.2FeMnO₄