Abstract
The physical properties of the La0.6Y0.1Ca0.3MnO3 compound have been investigated, focusing on the magnetoresistance phenomenon studied by both dc and ac electrical transport measurements. X-ray diffraction and scanning electron microscopy analysis of ceramic samples prepared by the sol–gel method revealed that specimens are single phase and have average grain size of ∼0.5 μm. Magnetization and 4-probe dc electrical resistivity ρ(T,H) experiments showed that a ferromagnetic transition at T C ∼ 170 K is closely related to a metal-insulator (MI) transition occurring at essentially the same temperature T MI . The magnetoresistance effect was found to be more pronounced at low applied fields (H ≤ 2.5 T) and temperatures close to the MI transition. The ac electrical transport was investigated by impedance spectroscopy Z(f,T,H) under applied magnetic field H up to 1 T. The Z(f,T,H) data exhibited two well-defined relaxation processes that exhibit different behaviors depending on the temperature and applied magnetic field. Pronounced effects were observed close to T C and were associated with the coexistence of clusters with different electronic and magnetic properties. In addition, the appreciable decrease of the electrical permittivity ε′(T,H) is consistent with changes in the concentration of e g mobile holes, a feature much more pronounced close to T C .
References
Tokura Y (ed) (2000) Colossal magnetoresistance oxides. Gordon & Breach, New York
Jin S, Tiefel H, McCornack M, Fastnacht RA, Ramesh R,Chen LH (1994) Science 264:413
Burgy J, Moreo A, Dagotto E (2004) Phys Rev Lett 92:097202
Souza JA, Jardim RF (2005) Phys Rev B 71:054404
Dagoto E, Hotta T, Moreo A (2001) Phys Rep 344:1
Uehara M, Mori S, Chen CH, Cheong SW (1999) Nature 399:560
Hwang HY, Cheong S-W, Ong NP, Batlogg B (1996) Phys Rev Lett 77:2041
Fu YL (2000) Appl Phys Lett 77:118
Moreo A, Yunoki S, Dagotto E (1999) Science 283:2034
Schiffer PE, Ramirez AP, Bao W, Cheong SW (1995) Phys Rev Lett 75:3336
Fontcuberta J, Martnez B, Seffar A, Piñol S, Garcia-Muñoz JL, Obradors X (1996) Phys Rev Lett 76:1122
Maignan A, Sindaresan A, Varadaju UV, Raveau B (1998) J Magn Magn Mater 184:83
Shah WH, Hasanain SK (2002) J Magn Magn Mater 246:199
Hu J, Qin H, Niu H, Zhu L, Chen J, Xiao W, Pei Y (2003) J Magn Magn Mater 261:105
Glaser A, Ziese M (2002) Phys Rev B 66:094422
Castro GMB, Rodrigues AR, Machado FLA, de Araujo AEP, Jardim RF, Nigam AK (2004) J Alloy Compd 369:108
Carneiro AS, Fonseca FC, Jardim RF, Kimura T (2003) J Appl Phys 93:8074
Souza JA, Jardim RF, Muccillo R, Muccillo ENS, Torikachvili MS, Neumeier JJ (2001) J Appl Phys 89:6636
Fonseca FC, Souza JA, Jardim RF, Muccillo R, Muccillo ENS, Gouvêa D, Jung MH, Lacerda AH (2003) Phys Status Solidi A 199:255
Fonseca FC, Souza JA, Jardim RF, Muccillo R, Muccillo ENS, Gouvea D, Jung MH, Lacerda AH (2004) J Eur Ceram Soc 24:1271
Bauerle J (1969) J Phys Chem Solids 30:2657
Fonseca FC, Muccillo R (2002) Solid State Ionics 149:309
Escote MT, da Silva AM, Matos JR, Jardim RF (2000) J Solid State Chem 151:298
Wang YX, Du Y, Qin RW, Han B, Du J, Lin JH (2001) J Solid State Chem 156:237
Fletcher JG, West AR, Irvine JTS (1995) J Electrochem Soc 142:2650
van Dijk T, Burggraaf AJ (1981) Phys Status Solid A 63:229
Guo X, Sigle W, Fleig J, Maier J (2002) Solid States Ionics 154–155:555
Moreo A, Yunoki S, Dagotto E (1999) Science 283:2034
Goya GF, Souza JA, Jardim RF (2002) J Appl Phys 91:7932
Cohn JL, Peterca M, Neumeier JJ (2004) Phys Rev B 70:214433
Wang CC, Cui YM, Xie GL, Chen CP, Zhang LW (2005) Phys Rev B 72:064513
Freitas RS, Mitchell JF, Schiffer P (2005) Phys Rev B 72:144429
Biškup N, de Andrés A, Martinez JL (2005) Phys Rev B 72:024115
Pimenov A, Biberacher M, Ivannikov D, Loidl A, Mukhin AA, Goncharov YuG, Balbashov AM (2006) Phys Rev B 73:220407
See, for example, Lunkenheimer P, Fichtl R, Ebbinghaus SG, Loidl A (2004) Phys Rev B 70:17210; Lunkenheimer P, Bobnar V, Pronin AV, Ritus AI, Volvok AA, Loidl A (2002) Phys. Rev. B 66:052105
Kimura T, Goto T, Shintani H, Ishizaka K, Arima T, Tokura Y (2003) Nature 426:55
Acknowledgements
This work was partially supported by the Brazilian agencies FAPESP (01/04231-0, 02/01856-1, and 05/53241-9) and CNPq (303272/2004-0, 306496/88-7, 300934/94-7, and 301661/2004-9).
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Fonseca, F.C., Souza, J.A., Muccillo, E.N.S. et al. Ac and dc magnetotransport properties of the phase-separated La0.6Y0.1Ca0.3MnO3 manganite. J Mater Sci 43, 503–509 (2008). https://doi.org/10.1007/s10853-007-1822-4
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DOI: https://doi.org/10.1007/s10853-007-1822-4