Magnetocaloric effect and critical behavior in La0.8K0.2MnO3 nanoparticle

Skini, RidhaUppsala universitet,Institutionen för fysik och astronomi (författare)

We report on the magnetocaloric effect and critical phenomenon on La0.8K0.2MnO3 nanoparticle through a systematic magnetic and electrical measurement. The magnetic entropy change (Delta S-M) presents close values obtained from resistivity and magnetic measurements, however, with a discrepancy in the magnetic entropy maximum values. This discrepancy is due to the presence of an extrinsic effect associated with the nanometric grain size affecting the electrical behavior. Interestingly, our results show a good agreement with the calculation of the critical exponents and the temperature coefficient of resistance shows positive and negative values. The obtained critical exponents are close to that of the mean-field theory (with beta = 0.5, gamma = 1, and delta = 3). This indicates a long-range interaction between spins a consequence of the presence the presence of dipole- dipole interaction in this system.

Baaziz, H.Univ Sfax, Fac Sci Sfax, Lab Phys Appl, BP 802, Sfax 3018, Tunisia. (författare)
Tozri, A.Univ Sfax, Fac Sci Sfax, Lab Phys Appl, BP 802, Sfax 3018, Tunisia.;Jouf Univ, Coll Sci, Phys Dept, POB 2014, Sakaka, Saudi Arabia. (författare)
Abdel-Hafiez, M.Faculty of Science, Physics Department, Fayoum University, 63514 Fayoum, Egypt (författare)
Hassan, A.Fayoum Univ, Fac Sci, Dept Phys, Al Fayyum 63514, Egypt. (författare)
Uppsala universitetInstitutionen för fysik och astronomi (creator_code:org_t)

Av författaren/redakt...: Skini, Ridha; Baaziz, H.; Tozri, A.; Abdel-Hafiez, M.; Hassan, A.

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