Relation between magnetic entropy and resistivity in La/sub 0.67/Ca/sub 0.33/MnO/sub 3/

Xiong, Chao; Sun, J. R.; Chen, Y.F.; Shen, B. G.; Du, Junjie; Li, Y.X.

doi:10.1109/tmag.2004.840132

Cited by 75 publications

(33 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the manganite La 0.67 Ca 0.33 MnO 3 the parameter a is equal to 21.72 emu/g. 19 For our materials, we found that a is equal to 22.82 emu/g. This is determined from the fitting of q versus M curve around the transition temperature T C with the equation: q ¼ a exp(ÀM/T) 19 (not shown here).…”

Section: Resultsmentioning

confidence: 62%

“…It is obvious that there is a relationship between the change in magnetic entropy and resistivity. In this context, Xiong et al 19 proposed a relationship between DS M and q given by…”

Section: Resultsmentioning

confidence: 99%

“…17,18 Also, we can see a strong correlation between resistivity and magnetic entropy change (DS M ) described by Xiong et al 19 So we can calculate DS M based on the electric measurement.…”

mentioning

confidence: 87%

See 2 more Smart Citations

Influence of Ca-deficiency on the magneto-transport properties in La0.8Ca0.2MnO3 perovskite and estimation of magnetic entropy change

Khlifi

Bejar

Dhahri

et al. 2012

Journal of Applied Physics

View full text Add to dashboard Cite

La 0.8 Ca 0.2 À x h x MnO 3 (x ¼ 0.00, 0.10, and 0.20) perovskite was prepared by the conventional solid-state reaction and annealed at 1473 K. X-ray diffraction and scanning electron microscopy shown the existence of a secondary phase attributed to the unreacted Mn 3 O 4 oxide. The magneto transport properties have been investigated based on the temperature dependence of the resistivity q(T) measurements under several applied magnetic fields. We note that the La 0.8 Ca 0.2 MnO 3 (x ¼ 0.00) sample has a classical metal-insulator transition at T q . But we have observed that the lacunars samples (x ¼ 0.10 and 0.20) include a metallic and insulator behavior simultaneously below T q and the resistivity is dominated by tunneling through the barriers associated with the insulating phase. In other words, the calcium deficiency favors the enhancement of the insulator behavior. The electrical resistivity is fitted with the phenomenological percolation model, which is based on the phase segregation of ferromagnetic metallic clusters and paramagnetic insulating regions. Furthermore, we found that the estimated results are in good agreement with experimental data. Above all, the resistivity dependence on the temperature and magnetic field data is used to deduce the magnetic entropy change. We have found that these magnetic entropy change values are similar to those calculated in our previous work from the magnetic measurements. Finally, we have found an excellent estimation of the magnetic entropy change based on the Landau theory.

show abstract

Section: Resultsmentioning

confidence: 62%

“…It is obvious that there is a relationship between the change in magnetic entropy and resistivity. In this context, Xiong et al 19 proposed a relationship between DS M and q given by…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Influence of Ca-deficiency on the magneto-transport properties in La0.8Ca0.2MnO3 perovskite and estimation of magnetic entropy change

Khlifi

Bejar

Dhahri

et al. 2012

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…17 Interest in lanthanum manganite has been rekindled in the last few years due to the observation of large magnetoresistance in films deposited by pulsed laser deposition. Thin films of La-Ca-Mn-O, [18][19][20][21] La-Ba-Mn-O, 22 La-(Ca,Pb)-Mn-O, 23 La-Ce-Mn-O, 24 and La-Sr-Mn-O 25 exhibit magnetoresistance in the range of 5%-150%, which is comparable to that obtained in giant magnetoresistance (GMR) metal multilayers. Jin et al and McCormack et al reported 26,27 a "colossal" magnetoresistance of more than 100 000% for epitaxial La-Ca-Mn-O films on LaAlO 3 .…”

Section: Introductionmentioning

confidence: 58%

Correlation between structural parameters and the magnetocaloric effect in epitaxial La0.8Ca0.2MnO3/LaAlO3 thin film

Debnath

Kim

Heo

et al. 2013

Journal of Applied Physics

View full text Add to dashboard Cite

Dou, S. X. (2013). Correlation between structural parameters and the magnetocaloric effect in epitaxial La0.8Ca0.2MnO3/LaAlO3 thin film. Journal of Applied Physics, 113 (6), 063508-1-063508-6. Correlation between structural parameters and the magnetocaloric effect in epitaxial La0.8Ca0.2MnO3/LaAlO3 thin film Abstract An epitaxial La0.8Ca0.2MnO3/LaAlO 3 (LCMO/LAO) thin film was fabricated using the pulsed laser deposition technique to evaluate the correlation between the crystal structure and the magnetocaloric effect. In our study, the LCMO film was 200 nm in thickness and appeared to have a strong out-of plane texture. We found that each column in the LCMO thin film layer is a domain which has a different ordering direction. These microscopic feature results in anisotropic properties of magnetization, entropy, and relative cooling power. The film exhibited a paramagnetic-to-ferromagnetic second order phase transition at 249 K. The lack of any hysteresis loss also confirmed that the material is intrinsically reversible. In addition, the large magnetization of the thin film results in an entropy change larger than those of all other perovskite type materials. Consequently, the relative cooling power is significantly enhanced. An epitaxial La 0.8 Ca 0.2 MnO 3 /LaAlO 3 (LCMO/LAO) thin film was fabricated using the pulsed laser deposition technique to evaluate the correlation between the crystal structure and the magnetocaloric effect. In our study, the LCMO film was 200 nm in thickness and appeared to have a strong out-of plane texture. We found that each column in the LCMO thin film layer is a domain which has a different ordering direction. These microscopic feature results in anisotropic properties of magnetization, entropy, and relative cooling power. The film exhibited a paramagnetic-toferromagnetic second order phase transition at 249 K. The lack of any hysteresis loss also confirmed that the material is intrinsically reversible. In addition, the large magnetization of the thin film results in an entropy change larger than those of all other perovskite type materials. Consequently, the relative cooling power is significantly enhanced. V C 2013 American Institute of Physics. [http://dx

show abstract

“…Indeed, Xiong et al [7] have established an interesting relationship between magnetic entropy change and resistivity ρ(T, H) for the manganites:…”

Section: Resultsmentioning

confidence: 99%

Magnetocaloric effect and temperature coefficient of resistance of La_0.85Ag_0.15MnO₃epitaxial thin films obtained by polymer-assisted deposition

Acosta

Muñoz-Pérez

Cadogan

et al. 2014

EPJ Web of Conferences

View full text Add to dashboard Cite

Abstract. We report the magnetocaloric effects and temperature coefficient of resistance (TCR) of La 0.85 Ag 0.15 MnO 3 epitaxial thin films grown on single-crystal substrates of LaAlO 3 (001) and SrTiO 3 (001) using the chemical solution approach of polymer-assisted deposition (PAD). The film thicknesses are in the range 30-35 nm. Magnetocaloric effects, with entropy changes of -2.14 J/kg.K, in the case of the LaAlO 3 substrate and -2.72 J/kg.K for the SrTiO 3 substrate, (corresponding to a magnetic field variation of 2T) were obtained at room temperature. The refrigeration capacity at this field variation reached large values of 125 J/kg and 216 J/kg, indicating that these films prepared by PAD have the potential for microcooling applications. The temperature coefficient of resistance has been calculated from the resistivity measurements. A maximum TCR value of 3.01 % K -1 was obtained at 309 K, which shows that these films also have potential as uncooled thermometers for bolometric applications.

show abstract

Relation between magnetic entropy and resistivity in La/sub 0.67/Ca/sub 0.33/MnO/sub 3/

Cited by 75 publications

References 14 publications

Influence of Ca-deficiency on the magneto-transport properties in La0.8Ca0.2MnO3 perovskite and estimation of magnetic entropy change

Influence of Ca-deficiency on the magneto-transport properties in La0.8Ca0.2MnO3 perovskite and estimation of magnetic entropy change

Correlation between structural parameters and the magnetocaloric effect in epitaxial La0.8Ca0.2MnO3/LaAlO3 thin film

Magnetocaloric effect and temperature coefficient of resistance of La_0.85Ag_0.15MnO₃epitaxial thin films obtained by polymer-assisted deposition

Contact Info

Product

Resources

About

Relation between magnetic entropy and resistivity in La/sub 0.67/Ca/sub 0.33/MnO/sub 3/

Cited by 75 publications

References 14 publications

Influence of Ca-deficiency on the magneto-transport properties in La0.8Ca0.2MnO3 perovskite and estimation of magnetic entropy change

Influence of Ca-deficiency on the magneto-transport properties in La0.8Ca0.2MnO3 perovskite and estimation of magnetic entropy change

Correlation between structural parameters and the magnetocaloric effect in epitaxial La0.8Ca0.2MnO3/LaAlO3 thin film

Magnetocaloric effect and temperature coefficient of resistance of La0.85Ag0.15MnO3epitaxial thin films obtained by polymer-assisted deposition

Contact Info

Product

Resources

About

Magnetocaloric effect and temperature coefficient of resistance of La_0.85Ag_0.15MnO₃epitaxial thin films obtained by polymer-assisted deposition