Critical Phenomena in the Double-Exchange Ferromagnet<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>La</mml:mi></mml:mrow><mml:mrow><mml:mn>0.7</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>0.3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>MnO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Ghosh, K.; Lobb, C. J.; Greene, R. L.; Karabashev, S. G.; Shulyatev, D. A.; Arsenov, A. A.; Mukovskiǐ, Ya. M.

doi:10.1103/physrevlett.81.4740

Cited by 322 publications

(157 citation statements)

References 22 publications

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“…Crystal quality, different chemical compositions of the manganite, and even the temperature range selected for fitting 34 (as also seems to be the case for the EuO/BTO system) can have noticeable effects on b. [34][35][36][37][38] For the LSMO/BTO system, our results show consistency with prior values obtained for the LSMO system, specifically with those that fit the mean field theory predictions.…”

supporting

confidence: 84%

Magnetoelectric coupling at the EuO/BaTiO3 interface

Cao

Liu

Tang

et al. 2013

Applied Physics Letters

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Magnetization modulation by ferroelectric polarization switching is reported for the ferromagnetic-ferroelectric EuO/BaTiO3 heterostructure. The value of the magnetization critical exponent β is consistent with the expected Heisenberg-like ferromagnetism of EuO and reported Curie temperature. The critical exponent is seen to decrease with increased magnetic coupling. The results are discussed in the context of data obtained earlier for epitaxial La0.67Sr0.33MnO3/BaTiO3 heterostructures, where magnetization increases and critical exponent β also declines with ferroelectric polarization pointing away from ferromagnetic layer. The observed similarity between two systems illustrates an importance of charge doping in magnetoelectric coupling, which can be modulated by ferroelectric polarization reversal.

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supporting

confidence: 84%

Magnetoelectric coupling at the EuO/BaTiO3 interface

Cao

Liu

Tang

et al. 2013

Applied Physics Letters

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“…Thus in an effort to understand the nature of the magnetic transition in Mn 0.94 Nb 0.06 CoGe, we performed a critical exponent analysis in the vicinity of the FM-PM region. [18][19][20] We demonstrate that the critical phenomena near PM-FM Curie temperature transition are described by using the field dependence of magnetic entropy change rather than by other models. The mean field interaction model for long range ordering has theoretical critical exponents of b ¼ 0.…”

mentioning

confidence: 89%

“…Recent investigations have revealed that an effective way of probing the magnetic interactions responsible for the magnetic transitions is by performing a critical exponent analysis in the vicinity of the ferromagnetic (FM)-paramagnetic (PM) region. [18][19][20] Thus, in an effort to understand the nature of the magnetic transition in Mn 0.94 Nb 0.06 CoGe, we performed a critical exponent study by using the field dependence of magnetic entropy change method. To date, to the best of our knowledge, no experimental study of the critical phenomena has been reported for the Mn 1Àx Nb x CoGe system by using the above mentioned method.…”

mentioning

confidence: 99%

Investigation of the critical behavior in Mn0.94Nb0.06CoGe alloy by using the field dependence of magnetic entropy change

Debnath

Shamba

Strydom

et al. 2013

Journal of Applied Physics

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Dou, S. X. (2013). Investigation of the critical behavior in Mn0.94Nb 0.06CoGe alloy by using the field dependence of magnetic entropy change. Journal of Applied Physics, 113 (9), 093902-1-093902-5.Investigation of the critical behavior in Mn0.94Nb 0.06CoGe alloy by using the field dependence of magnetic entropy change AbstractThe critical behaviour of Mn0.94Nb0.06CoGe alloy around the paramagnetic-ferromagnetic phase transition was studied based on the field dependence on magnetic entropy change. By using the obtained exponents, the modified Arrott plot is consistent with that by using conventional method. These critical exponents are confirmed by the Widom scaling relation. Based on these critical exponents, the magnetization, field and temperature data around Tc collapse into two curves obeying the single scaling equation MðH; e)¼ebf6(H/ ebþc). The calculated critical exponents not only obey the scaling theory but also anastomose the deduced results from the Kouvel-Fisher method [ J. S. Kouvel and M. E. Fisher, Phys. Rev. 136, A1626 (1964)]. The values deduced for the critical exponents in the Mn0.94Nb0.06CoGe alloy are close to the theoretical prediction of the mean-field model, indicating that the magnetic interactions are long range. This method eliminates the drawback due to utilization of multistep nonlinear fitting in a conventional manner. So it provides an alternative method to investigate the critical behaviour. The critical behaviour of Mn 0.94 Nb 0.06 CoGe alloy around the paramagnetic-ferromagnetic phase transition was studied based on the field dependence on magnetic entropy change. By using the obtained exponents, the modified Arrott plot is consistent with that by using conventional method. These critical exponents are confirmed by the Widom scaling relation. Based on these critical exponents, the magnetization, field and temperature data around Tc collapse into two curves obeying the single scaling equation

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“…Following a method described in Ref. 55 , we obtain M s (T ) and 1/χ 0 (T) by polynomial fitting the curves in the Arrott plot and extrapolating them to the vertical and horizontal axes, respectively. Fig.…”

Section: Transport Measurementsmentioning

confidence: 99%

Spin correlations and colossal magnetoresistance inHgCr2Se4

Lin

Shi

et al. 2016

Phys. Rev. B

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This study aims to unravel the mechanism of colossal magnetoresistance (CMR) observed in n-type HgCr2Se4, in which low-density conduction electrons are exchange-coupled to a threedimensional Heisenberg ferromagnet with a Curie temperature TC ≈ 105 K. Near room temperature the electron transport exhibits an ordinary semiconducting behavior. As temperature drops below T * ≃ 2.1 TC, the magnetic susceptibility deviates from the Curie-Weiss law, and concomitantly the transport enters an intermediate regime exhibiting a pronounced CMR effect before a transition to metallic conduction occurs at T < TC . Our results suggest an important role of spin correlations not only near the critical point, but also for a wide range of temperatures (TC < T < T * ) in the paramagnetic phase. In this intermediate temperature regime the transport undergoes a percolation type of transition from isolated magnetic polarons to a continuous network when temperature is lowered or magnetic field becomes stronger.

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Critical Phenomena in the Double-Exchange FerromagnetLa0.7Sr0.3MnO3

Cited by 322 publications

References 22 publications

Magnetoelectric coupling at the EuO/BaTiO3 interface

Magnetoelectric coupling at the EuO/BaTiO3 interface

Investigation of the critical behavior in Mn0.94Nb0.06CoGe alloy by using the field dependence of magnetic entropy change

Spin correlations and colossal magnetoresistance inHgCr2Se4

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