Field and temperature dependence of magnetic viscosity in randomly canted Li-Ti ferrite

Godinho, M.; Carvalho, A.; Noguès, M.; Dormann, J.L.; Seqqat, M.

doi:10.1016/0304-8853(94)90594-0

Cited by 4 publications

(3 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Typically, in the SG ordered region, the magnetic viscosity S increases with increase in T as a signature of the thermally activated process. However, in ZCFMO, decrease in S with increasing T in figure 20 reveals that the properties in the SL region are not governed by thermal activation [68]. In support of the above results, the differentiation analysis ∂S/∂T vs. T (figure 20(b)) exhibits a sharp minimum across 9 K, as the ZCFMO system undergoes SL to SG magnetic phase transition.…”

Section: Spin-glass (Sg) Vs Spin-liquid (Sl) Statesupporting

confidence: 64%

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

View full text Add to dashboard Cite

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.

show abstract

Section: Spin-glass (Sg) Vs Spin-liquid (Sl) Statesupporting

confidence: 64%

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

View full text Add to dashboard Cite

show abstract

“…(2), the behaviour is different since S 2 increases with temperature as in small particles and spin-glass regimes, then reaches a maximum before to decrease rapidly. This unusual behaviour has been previously reported for local canted state ferrites [35]. In this concentration range, the ferromagnetic regime is highly perturbed and a cluster regime occurs below 45 K as can be seen from the variation of the coercive field and ac susceptibility.…”

Section: Thermoremanent Magnetisationmentioning

confidence: 65%

Magnetic structure and phase diagram of the frustrated spinel Cd1−xZnxCr2Se4

Loudghiri¹,

Belayachi²,

Noguès³

et al. 2008

Journal of Magnetism and Magnetic Materials

Self Cite

View full text Add to dashboard Cite

“…The properties of the three systems C [45][46][47], D [39,48] and E [40,49,50] for the compositions studied are similar. A non-linear continuous increase of the magnetization with the applied field is observed at all temperatures until H = 20 T. This means that canted spin structure occurs for any temperature lower than T N .…”

Section: General Properties Of the Systems Studiedmentioning

confidence: 83%

Critical analysis of magnetically semi-disordered systems: critical exponents at various transitions

Belayachi

Dormann

Noguès

1998

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

The critical analysis of various magnetically semi-disordered compounds with spinel structure is reported. The magnetic equation of state is valid in the vicinity of the different observed transitions and the critical exponents are determined by different methods. At the magnetic-paramagnetic transition, the critical exponents and are larger and smaller respectively than those found for 3D Heisenberg ferromagnets. The exponent variations are explained phenomenologically and allow a classification of the compounds to be made according to the degree of disorder. At low temperature, for some materials a mixed state occurs below the re-entrant transition, characterized by critical exponents, while for other materials local canted states exist, where the transverse spin components block progressively, revealing an absence of a true phase transition. At high temperature, a well established spin-cluster regime occurs in some cases. Two transitions with critical exponents are evident, the magnetic-cluster and the cluster-paramagnetic transitions.

show abstract

Field and temperature dependence of magnetic viscosity in randomly canted Li-Ti ferrite

Cited by 4 publications

References 2 publications

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

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

Magnetic structure and phase diagram of the frustrated spinel Cd1−xZnxCr2Se4

Critical analysis of magnetically semi-disordered systems: critical exponents at various transitions

Contact Info

Product

Resources

About

Field and temperature dependence of magnetic viscosity in randomly canted Li-Ti ferrite

Cited by 4 publications

References 2 publications

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

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

Magnetic structure and phase diagram of the frustrated spinel Cd1−xZnxCr2Se4

Critical analysis of magnetically semi-disordered systems: critical exponents at various transitions

Contact Info

Product

Resources

About

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

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