Critical Behavior in the Magnetic Ordering of the 95%Ni-2%Mn-2%Al Alloy
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| Format: | Artículo científico |
| Language: | en |
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Sociedad Mexicana de Física A.C.
2012
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| _version_ | 1876423149760806912 |
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| author | R.A. Bonilla |
| author_facet | R.A. Bonilla |
| contents | Critical Behavior in the Magnetic Ordering of the 95%Ni-2%Mn-2%Al Alloy R.A. Bonilla D. Peña Lara J. Trujillo R.A. Vargas H. Correa J.E. Diosa Física, Astronomía y Matemáticas high alumel Specific heat critical exponent resolution ac calorimetry In this work we report a study of the specific heat at normal pressure and at zero magnetic field in the 95%Ni-2%Mn-2%Al alloy near its Curie temperature at TC = 463 K. The specific heat was measured by using high-resolution ac calorimetry technique (under modulated temperature). Adjustments were made by using a cP (T)-function near its Curie critical temperature, TC. The cP (T)-functionality is a powerserie expansions in α-critical exponent giving by cP (T)= €-α(A0 + B0€-α + A1€ + B1€1+α), where Ai are the amplitudes and Bi the background contributions. The best values of fitting parameters are: for T < TC was obtained α=0.34, A´0 = 0, B´0 = 1:5, A´1 = 0, B´1 = 1 with TC = 462:1 K and for T > TC was obtained α=0.20, A0 = 0.48, B0 = -119.8, A´1 = 0, B´1 = 0,27 for Tc = 464.0 K, showing a slight similarity between the critical exponents when € — 0- and € — 0+, respectively. In summary, we report that the critical exponent α = 027 ± 007 is in the range accepted by international literature for other second-order phase transitions for ferromagnetic-paramagnetic ordering (α=0.3). The characteristics of this system near TC are very similar to that of pure Ni. 2012 artículo científico 0035-001X https://www.redalyc.org/articulo.oa?id=57030392016 en http://www.redalyc.org/revista.oa?id=570 Revista Mexicana de Física application/pdf Sociedad Mexicana de Física A.C. Revista Mexicana de Física (México) Num.2 Vol.58 |
| format | Artículo científico |
| id | redalyc_57030392016 |
| institution | Redalyc |
| language | en |
| publishDate | 2012 |
| publisher | Sociedad Mexicana de Física A.C. |
| spellingShingle | Critical Behavior in the Magnetic Ordering of the 95%Ni-2%Mn-2%Al Alloy R.A. Bonilla Física, Astronomía y Matemáticas high alumel Specific heat critical exponent resolution ac calorimetry Critical Behavior in the Magnetic Ordering of the 95%Ni-2%Mn-2%Al Alloy R.A. Bonilla D. Peña Lara J. Trujillo R.A. Vargas H. Correa J.E. Diosa Física, Astronomía y Matemáticas high alumel Specific heat critical exponent resolution ac calorimetry In this work we report a study of the specific heat at normal pressure and at zero magnetic field in the 95%Ni-2%Mn-2%Al alloy near its Curie temperature at TC = 463 K. The specific heat was measured by using high-resolution ac calorimetry technique (under modulated temperature). Adjustments were made by using a cP (T)-function near its Curie critical temperature, TC. The cP (T)-functionality is a powerserie expansions in α-critical exponent giving by cP (T)= €-α(A0 + B0€-α + A1€ + B1€1+α), where Ai are the amplitudes and Bi the background contributions. The best values of fitting parameters are: for T < TC was obtained α=0.34, A´0 = 0, B´0 = 1:5, A´1 = 0, B´1 = 1 with TC = 462:1 K and for T > TC was obtained α=0.20, A0 = 0.48, B0 = -119.8, A´1 = 0, B´1 = 0,27 for Tc = 464.0 K, showing a slight similarity between the critical exponents when € — 0- and € — 0+, respectively. In summary, we report that the critical exponent α = 027 ± 007 is in the range accepted by international literature for other second-order phase transitions for ferromagnetic-paramagnetic ordering (α=0.3). The characteristics of this system near TC are very similar to that of pure Ni. 2012 artículo científico 0035-001X https://www.redalyc.org/articulo.oa?id=57030392016 en http://www.redalyc.org/revista.oa?id=570 Revista Mexicana de Física application/pdf Sociedad Mexicana de Física A.C. Revista Mexicana de Física (México) Num.2 Vol.58 |
| title | Critical Behavior in the Magnetic Ordering of the 95%Ni-2%Mn-2%Al Alloy |
| topic | Física, Astronomía y Matemáticas high alumel Specific heat critical exponent resolution ac calorimetry |
| url | https://www.redalyc.org/articulo.oa?id=57030392016 |