Comparison of pressure, magnetic field and excess manganese effects on transport properties of film and bulk ceramic La-Ca manganites

Электpонные свойства металлов и сплавов

Автор(и)

  • V.I. Mikhaylov A. Galkin Donetsk Physical-Technical Institute, National Academy of Sciences of Ukraine 72 R. Luxemburg Str., Donetsk, 83114, Ukraine
  • S.J. Lewandowski Institute of Physics, PAS, 32/46 Lotnikow Al., 02- 669 Warsaw, Poland
  • K. Dyakonov A.F. Ioffe Physical-Technical Institute, RAS, 26 Politechnicheskaya Str., St. Petersburg, 194021, Russia
  • K. Piotrowski Institute of Physics, PAS, 32/46 Lotnikow Al., 02- 669 Warsaw, Poland
  • A. Abal`oshev Institute of Physics, PAS, 32/46 Lotnikow Al., 02- 669 Warsaw, Poland
  • A. Szewczyk Institute of Physics, PAS, 32/46 Lotnikow Al., 02- 669 Warsaw, Poland
  • V.A. Shtaba A. Galkin Donetsk Physical-Technical Institute, National Academy of Sciences of Ukraine 72 R. Luxemburg Str., Donetsk, 83114, Ukraine
  • V.N. Varyukhin A. Galkin Donetsk Physical-Technical Institute, National Academy of Sciences of Ukraine 72 R. Luxemburg Str., Donetsk, 83114, Ukraine
  • A.V. Pashchenko A. Galkin Donetsk Physical-Technical Institute, National Academy of Sciences of Ukraine 72 R. Luxemburg Str., Donetsk, 83114, Ukraine
  • E.E. Zubov A. Galkin Donetsk Physical-Technical Institute, National Academy of Sciences of Ukraine 72 R. Luxemburg Str., Donetsk, 83114, Ukraine
  • V.P. Dyakonov A. Galkin Donetsk Physical-Technical Institute, National Academy of Sciences of Ukraine 72 R. Luxemburg Str., Donetsk, 83114, Ukraine
  • Н. Szymczak Institute of Physics, PAS, 32/46 Lotnikow Al., 02- 669 Warsaw, Poland

DOI:

https://doi.org/10.1063/1.2171514

Ключові слова:

manganites, resistance, MRE, metal-insulator phase transition, excess manganese, ceramic, double exchange, small polaron hopping and variable range hopping models

Анотація

The pressure, magnetic field and excess manganese effects on transport and magnetoresistance effect (MRE) have been studied in both the epitaxial films and bulk ceramics of manganites (La0.7Ca0.3)1–xMn1+xO3–y (x = 0–0.2). A comparison of electrical behavior in both kinds of samples of similar composition at hydrostatic pressures of up to 1.8 GPa and in a magnetic fields of up to 8 kOe has been performed. The pressure and magnetic field effects are shown to increase with increasing manganese content. Experimental data show that the pressure and magnetic field effects on temperatures of both metal–insulator transition (TMD) and MRE peak (TMR) are considerably stronger in the films than in ceramics. The hydrostatic pressure increases TMD and TMR. Magnetoresistance effect for both types of samples was shown to be favored by the pressure and magnetic field in an opposite way. A direct correlation is established between TMD and conductivity bandwidth as well as between MRE and concentration of charge carriers at applied pressure. The differences in the values of pressure effect on resistance, MRE and TMD temperature in the films and ceramics are connected with both granular structure of ceramics and the oxygen nonstoichiometry in ceramic and film samples of the same content as well as with the film strain induced by lattice mismatch between the film and the substrate. The origin of pressure–magnetic field effects is analyzed in the framework of double exchange interaction and small polaron hopping, and variable range hopping models.

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Опубліковано

2005-12-23

Як цитувати

(1)
Mikhaylov, V.; Lewandowski, S.; Dyakonov, K.; Piotrowski, K.; Abal`oshev, A.; Szewczyk, A.; Shtaba, V.; Varyukhin, V.; Pashchenko, A.; Zubov, E.; Dyakonov, V.; Szymczak Н. Comparison of Pressure, Magnetic Field and Excess Manganese Effects on Transport Properties of Film and Bulk Ceramic La-Ca Manganites: Электpонные свойства металлов и сплавов. Fiz. Nizk. Temp. 2005, 32, 190-200.

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