Critical behavior near the paramagnetic to ferromagnetic phase transition temperature in La0.7Pb0.05Na0.25MnO3

Tozri, A.; Dhahri, E.; Hlil, E.K.; Valente, M.A.

doi:10.1016/j.ssc.2010.11.036

Cited by 58 publications

(9 citation statements)

References 38 publications

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“…However, there is a nonlinear response to increasing external field, and in the temperature dependent susceptibility. Furthermore, a typical ferromagnetic shows magnetization values much greater than those shown by our sample over a wide temperature range excluding the curie tail (near 2 K) . The combination of these results leads to the conclusion that our material is super‐paramagnetic .…”

Section: Discussionsupporting

confidence: 54%

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Novel Solid‐State Microbial Sensors Based on ZnO Nanorod Arrays

Landry

Burns

Baerlocher

et al. 2018

Adv Funct Materials

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Gravity and magnetism are implemented to change the morphology of zinc oxide nanorod sensors during synthesis. The effects of gravity and magnetism can translate into future application of these nanorods through cost-effective, environmentally friendly, and easy-to-use biosensor technology with the quickest available sensing. The sensors can pave the way toward detection of both bacteria and fungi present on the surface with high sensitivity. This ability to sense microorganisms in a "non-solution-based" environment represents a key step forward in the fields of health and food safety, as well as solid-state nanomaterial biotechnology applications. Hundreds of thousands of people are affected each year by accidental contamination and current protocols are far from preventative. The results of the magnetic field studies when compared with previous results show that the following factors affect the outcome of applying magnetic field during the growth of nanorods on their morphology: the direction of growth with respect to gravity, the method of seeding, and the substrate.

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Section: Discussionsupporting

confidence: 54%

“…The microorganisms would colonize on the sections by movement onto the surface of the section and then would reproduce. The resistances of the sections were measured before the sections were placed into the agar gel plate and then again for 24 h of incubation. Three replicates were used for each treatment and microorganism.…”

Section: Methodsmentioning

confidence: 99%

Novel Solid‐State Microbial Sensors Based on ZnO Nanorod Arrays

Landry

Burns

Baerlocher

et al. 2018

Adv Funct Materials

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“…Among the fundamental questions which remain controversial is the universality class related to the paramagnetic (PM) to ferromagnetic (FM) transition in manganites [8][9][10]. The universality class does not depend on microscopic details of the system but only on global information such as the dimension of the order parameter and space.…”

Section: Introductionmentioning

confidence: 99%

“…The continuous nature of the FM to PM transition has been investigated carefully for high-T C manganites such as the work of Tozri et al for the compound La 0.7 Pb 0.05 Na 0.25 MnO 3 (T C = 335 K) [9] and also Ghosh et al for La 0.7 Sr 0.3 MnO 3 (T C = 355 K) [20]. On the other hand, an unexpected dependence of the order of the ferromagnetic transition on doping has been reported for La 1−x Ca x MnO 3 .…”

Section: Introductionmentioning

confidence: 99%

Critical Behavior Near the Paramagnetic to Ferromagnetic Phase Transition Temperature in Sr1.5Nd0.5MnO4 Compound

Zarai

Issaoui

Tozri

et al. 2016

J Supercond Nov Magn

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The magnetic properties and the critical behavior in Sr 1.5 Nd 0.5 MnO 4 have been investigated by magnetization measurements. The magnetic data indicate that the compound exhibits a second-order phase transition. The estimated critical exponents derived from the magnetic data using various techniques such as modified Arrott plot, Kouvel-Fisher method, and critical magnetization isotherms M (T C , H ). The critical exponent values for this compound was found to match well with those predicted for the mean-field model (δ = 2.212 ± 0.124, γ = 0.975 ± 0.018, and β = 0.502 ± 0.012) at T C = 228.59 ± 0.17. The critical exponent γ is slightly inferior than predicted from the mean-field model. Such a difference may be due, within the context of the quenched disorder and essentially the presence of the Griffiths phase. The temperature variation in the effective exponent (γ eff ) is similar to those for disordered ferromagnets.

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“…Whereas the recent theoretical calculations based on DE model have predicted that the FM-PM transition in CMR manganites should belong to the 3D-Heisenberg universality class [6,7]. By contrast, a few relevant experimental studies for critical exponents are still controversial including those for short-range Heisenberg interaction, the mean-field values [6][7][8][9], and those which cannot be classified into any universality class ever known [10].…”

Section: Introductionmentioning

confidence: 99%