2015
DOI: 10.1063/1.4918340
|View full text |Cite
|
Sign up to set email alerts
|

Comparison of the order of magnetic phase transitions in several magnetocaloric materials using the rescaled universal curve, Banerjee and mean field theory criteria

Abstract: Magnetocaloric materials with second order phase transition near the Curie temperature can be described by critical phenomena theory. In this theory, scaling, universality, and renormalization are key concepts from which several phase transition order criteria are derived. In this work, the rescaled universal curve, Banerjee and mean field theory criteria were used to make a comparison for several magnetocaloric materials including pure Gd, SmCo1.8Fe0.2, MnFeP0.46As0.54, and La0.7Ca0.15Sr0.15MnO3. Pure Gd, SmC… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
2
1
1
1

Citation Types

1
6
0

Year Published

2016
2016
2024
2024

Publication Types

Select...
9

Relationship

0
9

Authors

Journals

citations
Cited by 17 publications
(7 citation statements)
references
References 12 publications
1
6
0
Order By: Relevance
“…6(b) presents a nearly parallel linear relation of the ln(ÀDS)-ln(h) curve at T C with n = 0.648 for different V values, which is basically consistent with the experimental observation of perovskite manganites Pr 0.55 Sr 0.45 MnO 3 and Nd 0.55 Sr 0.45 MnO 3 corresponding to the conventional ferromagnets taking the mean field value 2/3. 22,23,36,37 The linear fits in Fig. 6(c) demonstrate the validity of the relationship ÀDS p h 0.648 at around T C that characterizes a second order phase transition, which is close to ÀDS p h 2/3 for conventional ferromagnets obeying the mean field theory.…”
Section: Resultssupporting
confidence: 59%
See 1 more Smart Citation
“…6(b) presents a nearly parallel linear relation of the ln(ÀDS)-ln(h) curve at T C with n = 0.648 for different V values, which is basically consistent with the experimental observation of perovskite manganites Pr 0.55 Sr 0.45 MnO 3 and Nd 0.55 Sr 0.45 MnO 3 corresponding to the conventional ferromagnets taking the mean field value 2/3. 22,23,36,37 The linear fits in Fig. 6(c) demonstrate the validity of the relationship ÀDS p h 0.648 at around T C that characterizes a second order phase transition, which is close to ÀDS p h 2/3 for conventional ferromagnets obeying the mean field theory.…”
Section: Resultssupporting
confidence: 59%
“…6(c) demonstrate the validity of the relationship ÀDS p h 0.648 at around T C that characterizes a second order phase transition, which is close to ÀDS p h 2/3 for conventional ferromagnets obeying the mean field theory. 36,37 Of particular interest is the scaling law related to the critical exponent b, g, and d, which obey the following relation at T = T C : 19,20,22,23 n(T C ) = 1 + (b À 1)/(b + g) = 1 + 1/d(1 À 1/b). (13) Herein, the critical exponents (b, g, and d) are determined by a detailed scaling analysis based on the Arrott-Noakes equation of state, 38 which are defined for the spontaneous magnetization M s (T), inverse initial susceptibility w 0 À1 , and critical isotherm (M(h)) at T C with the reduced temperature t = (T À T C )/T C as follows: 20,24,[38][39][40][41]…”
Section: Resultsmentioning
confidence: 99%
“…Based in Banerjee criterion, a positive or negative slope in ⁄ vs. curves determine the order of the magnetic phase transition. A positive slope indicates a second-order magnetic phase transition, whereas a negative slope indicates a first order magnetic phase transition [21]. From the data obtained, a positive slope is noticed for La0.7Ca0.23Sr0.07MnO3 nanofibers with heat treatments at 973 K, 1073 K and 1173 K, which is a proof of second-order magnetic phase transition.…”
Section: Magnetic Entropy Changementioning
confidence: 65%
“…Since then, the Banerjee criterion has been widely used whenever indications of temperature-induced first-order transitions were observed, in particular for metamagnetic isothermal magnetic-field measurements [17][18][19][20][21]. As a drawback of the Banerjee criterion, it can be noticed that while the (negative) slope is expected to increase continuously with increasing temperature, as originally pointed out in Banerjee's work [15], this is not observed in most of the experimental examples which use the criterion to propose first-order transitions [21][22][23][24].…”
Section: Introductionmentioning
confidence: 99%