Peculiarities of Magnetocaloric Effect in Manganites Connected with Magnetic Heterogeneous State
Magnetocaloric effect (MCE) or T-effect was studied in La1-xSrxMnO3, Sm0.55Sr0.45MnO3 and PrBaMn2O6 manganites. It has been found that the maximum value of MCE, measured by direct method, is far less than obtainable by computation from the change of the magnetic entropy in Curie temperature TC. This phenomenon is explained by presence in them of the magnetic two-phase ferromagnetic (F) – antiferromagnetic (AF) state. So in La1-xSrxMnO3 the negative contribution from AF portion of sample lowers MCE and displacesmaximum on T(T)-curve to the higher temperature than TC on 20-40 K. Maximum on T(T) curve of Sm0.55Sr0.45MnO3 is disposed near TC=134 K in the cooling in the air single-crystal and ceramic samples. The cooling inoxygen of single-crystal,restored the Mn-O-Mn broken connections, increases the volume of clusters with CE-type of AF order, results to that maximum on T(T) curve is disposed at Neel temperature TN of this phase (243 K). Magnetic field, applied to sample during T-measurement, transforms AF clusters into F state and theboth types of clusters decompose at TN. The PrBaMn2O6 manganite has two phase transactions: paramagnetic–F at TC=295 K and F–AF at TN=231 K. Phase with spontaneous magnetization obtains the understated magnetic moment. Curve T(T) has the wide maximum near TC and the sharp minimum near TN with the small T-values in both extremes: 0,13 K and - 0,2 K respectively. This is connected with presence of AF interactions in F phase and F interactions in AF phase.
L. I. Koroleva,
A. S. Morozov,
Peculiarities of Magnetocaloric Effect in Manganites Connected with Magnetic Heterogeneous State, American Journal of Modern Physics.
Vol. 2, No. 2,
2013, pp. 61-67.
X.X. Zhang , J. Tajada, Y. Xin ,G.F. Sun, K.W. Wong, and X. Bahigas. "Magnetocaloric effect inLa0.67Ca0.33MnO and La0.60Y0.07Ca0.33MnO bulk materials." Appl. Phys. Lett., vol.69, pp. 3596-3598, December 1996.
Z.B. Guo, Y.W. Du, J.S. Zhu, H. Huang, W.P. Ding, and D. Feng. "Large magnetic entropy change in perovskite-type manganese." Phys. Rev. Lett., vol. 78, pp. 1142-1145, March 1997.
W. Chen, W. Zhong, D. Houn, D. Hou, W. Ding, Y. Du, and Yan O. Structure and magnetocaloric properties in pe-rovskitelike La1-xNaxMnOz powders."Chin. Phys. Lett., vol.15, pp. 134-136, February 1998.
X. Bohigwas, J. Tejada, E. Del Barco, X.X. Zhang, and M. Sales. "Tunable magnetocaloric effect in ceramic perovs-kites." Appl. Phys. Lett., vol. 73, pp.390-392, January 1998.
V.K. Pecharsky, K.A. Gschneidner."Magnetocaloric effect and magnetic refrigeration." J. Magn. Magn. Mater., vol. 200, pp. 44-46, October 1999.
X. Bohigas, J. Tejada, M.L Marinez-Sarrion, S. Tripp, and R. Black. "Magnetic and calorimetric measurement on the magnetocaloric effect in La0.6Ca0.4MnO3."J. Magn. Magn. Mater., vol. 208, pp. 85-92, January 2000.
R.V. Demin, L.I. Koroleva. "Influence of the magnetic two-phase state on the magnetocaloric effect in manganites." Phys. Lett. A, vol. 317, pp. 140-143, July2003.
A.I. Abramovich, A.V. Michurin, O.Yu. Gorbenko, and A.R. Kaul."Giant magnetocaloric effect near Curie point in Sm0/6Sr0.4MnO3 manganites." Phys. Solid State, vol. 43, pp. 687-689, April 2001.
A.G. Gamzatov, A.M. Aliev, A.B. Batdalov, Sh.B. Abdul-vagidov, O.V. Mel’nikov, and O.Yu. Gorbenko. "Magneto-caloric effect in Ag-doped of lanthanummanganite." Tech. Phys. Lett., vol. 32, pp. 471-477, August 2006.
Yi Lu, Nai-li Di, Guang-jin Wang, Qing-an Li, and Zhao-hua Cheng. "Low-field-induced magnetic entropy change in single-crystal Nd0.47Sr0.53MnO3"J. Phys.: Condens. Matter., vol. 16, pp. L243-246,April 2004.
M. Phan, H. Peng, and S. Yu."Large magnetocaloric effect in single crystal Pr0.63Sr0.37MnO3."J.Appl. Phys., vol.97, pp. 10M306 (3 p.), October 2005.
I.K. Kamilov, A.G. Gamzatov, A.M. Aliev, A.B. Batdalov, A.L. Aliverdiev, Sh.B. Abdulvagidov, O.V. Mel’nikov, O.Yu. Gorbenko, R. Kaul. "Magnetocaloric effect in La1-xAgyMnO3 (y≤x): direct and indirect measurements."J. Phys. D: Appl. Phys., vol. 40, pp. 4413-4417, August, 2007.
I.R. Kamilov, A.G. Gamzatov, A.B. Batdalov, A.S. Manke-vich, and I.E. Korsakov. "Thermal theat and magnetocaloric properties ofLa1-xKxMnO3 manganites." Phys. Solid State, vol. 52, pp. 728-734, April 2010.
A.G. Gamzatov, А.B. Batdalov,A.M. Aliev, L.N. Khanov, H. Ahmad, H. Salamati, and P. Kameli. "Magnetocaloric effect in Pr1-xAgxMnO3manganite."JETP Lett. vol.91, pp. 369-373. April 2010.
D.M. Zashchirinskii, L.I. Koroleva, A.S. Morozov, and Yu.Y. Dolzhenkova. "Magnetocaloric effect in Sm0.55Sr0.45MnO3." Phys. Solid State, vol. 53, pp. 316-320,February 2011.
R. V. Demin, L. I. Koroleva, R. Szymszak, and H. Szyms-zak, "Experimental evidence for a magnetic two-phase state in manganites." JETP Lett., vol. 75, pp. 331-335, August 2002.
X. Moya, L.E. Hueso, F. Maccherozzi, A.I. Tovstolytkin, D.I. Podyalovskii, C. Ducati, L.C. Phillips, M. Ghidini, O. Hovorka, A. Berger, M.E. Vickers, E. Defay, S.S. Dhesi, and D. Mathur. "Giant and reversible magnetocaloric effects in La0.7Ca0.3MnO3 films due to strain". Nature Materials, vol. 12, pp. 52-58, January 2013.
E.L. Nagaev, Colossal Magnetoresistance and Phase Sepa-ration in Magnetic Semiconductors, Imperial College Press: Singapore 2002, pp.1- 461.
E. Dagotto, T. Hotta, and A. Moreo, "Colossal magnetore-sistant materials: the key role of phase separation." Phys. Rep., vol. 344, pp. 1-153, January 2001.
L.I. Koroleva. Magnetic semiconductors. Publishing of-physics department of MSU: Moscow 2003, pp. 1-315.
L.I. Koroleva, R. Szymczak, "Ferromagnetic-antiferromagnetic state in manganites."J. Phys. Chem. Sol., vol. 64, pp. 1565-1568, November2003.
G.L. Liu, J.S. Zhou, J.B. Goodenough, "Interplay between charge, orbilal, and magnetic ordering in La1-xSrxMnO3." Phys. Rev., vol. B64, pp.1-7, January 2001.
B.V. Znamenskii, I.G. Fakidov. "Magnetization and mag-netocaloric effect of Cu+22,8 at.% Mn polycrystalline alloy." Fiz. Met. Metalloved., vol. 13, pp. 312-314, February 1962.
M. Viret, H. Glattli, C. Fermon, A.M. Leon-Guevara,andA. Revcolevschi. "Magnetic Coherenceabove the Curie point in ferromagnetic LaSrMnO manganites." Europhys Lett., vol. 42, pp. 301-303, April 1998.
V.A. Ivashin, J. Deisenhofer, H.-A. Krug von Nidda, A. Loidl, A.A. Mukhin, A.M. Balbashov, andV. Eremin. „ESR study in lightly doped La1-xSrxMnO3." Phys. Rev., vol.B61, pp. 6213-6219, March2000.
A. Machida, Y. Moritomo, A. Nakamura Temperature evolution ofthe 1,5 eV absorption band indoped manganites. Formation of Jahn Teller clusters."Phys. Rev., A.M. Tishin "Magnetocaloric effect in the vicinity of phase transitions." In: Handbook of magnetic materials, vol.12,ed. K.H.J. Buschop, Elsevier Sci. B.V., 1999, pp. 395-524.
V. V. Runov, D. Yu. Chernyshov, A. I. Kurbakov,M. K. Runova, V. A. Trunov, and A. Okorokov "Mesoscopic magnetic heterogeneities in the lowtemperature phase and structure of Sm1-xSrxMnO3 (x < 0,5) perovskite." JETP,vol. 118, pp. 1174-1187, November 2000.
C. Martin, A. Maignan, M. Hervieu, and B. Raveau, "Magnetic phase diagrams of L1-xAxMnO3manganites (L = Pr, Sm; A = Ca, Sr)."Phys. Rev., vol. B60, pp. 12191 (8 p.), November 1999.
A. M. Aliev, Sh. B. Abdulvagidov, A. B. Batdalov,I. K. Kamilov, O. Yu. Gorbenko, and V. A.Amelichev. "Specific heat and electrical resistivity of Sm0.5Sr0.5MnO3 in field up to 26 kOe."JETP Lett., vol. 72, pp. 464-468, May 2000.
T. Nakajima, H. Yoshizawa, Y. Ueda, A-site radomness effect on structural and physical properties ofBa-based pe-rovskite manganites."J. Phys.Soc. Japan, vol. 73, pp. 2283-2291, August 2004.
A.I. Abramovich, L.I. Koroleva, A.V. Michurin. "Peculiari-ties of the magnetic, galvanomagnetic, elastic, and magne-toelactic properties of Sm1-xSr[MnO3 manganites." JETP, vol. 95, pp. 917-926, May 2002.
L.I. Koroleva, R.V. Demin, A.V. Kozlov, D.M. Zashchi-rinskii and Ya.M. Mukovskii. Relation between giant vo-lume magnetostric- tion, colossal magnetoresistance, and crystal lattice softening in manganites La1-xAxMnO3 (A= Ca, Ag, Ba, Sr). JETP, vol. 104, pp. 76-86, January 2007.