Effect of oxygen content on magnetization and magnetoresistance properties of CMR manganites

Автор(и)

  • S. V. Trukhanov Institute of Solid State and Semiconductor Physics of National Academy of Sciences of Belarus, 17 P. Brovki Str., Minsk 220072, Belarus
  • I. O. Troyanchuk Institute of Solid State and Semiconductor Physics of National Academy of Sciences of Belarus, 17 P. Brovki Str., Minsk 220072, Belarus
  • F. P. Korshunov Institute of Solid State and Semiconductor Physics of National Academy of Sciences of Belarus, 17 P. Brovki Str., Minsk 220072, Belarus
  • V. A. Sirenko B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Science of Ukraine 47 Lenin Ave., Kharkov 61164, Ukraine
  • H. Szymczak Institute of Physics of Polish Academy of Sciences, 32/46 Al. Lotnikow Str., 02-668 Warsaw, Poland
  • K. Baerner Physikalisches Institut der Universitat Goettingen, 11-15 Bunsenstr., 37073 Goettingen, Germany

Ключові слова:

PACS: 75.30.Vn, 75.30.Cr

Анотація

The influence of oxygen content on the magnetization and electrical resistivity of Ln0.5A0.5MnO3 (Ln=La,Pr,Nd; A=Ca,Ba) manganites with the perovskite structure is investigated. It is shown that the La0.5Ca0.5MnO3-g compound undergoes a sequence of transitions from an antiferromagnetic (g=0) to a spin-glass (g=0.17) state and then to an inhomogeneous ferromagnetic (g=0.3) state. A transition from an antiferromagnetic charge-ordered state to a ferromagnetic charge-disordered state in Nd0.5Ca0.5 MnO3-g is observed as the oxygen content is reduced to where g=0.07. The Nd0.5Ba0.5 MnO3-g compound shows an increase of the Curie point from 110 K (g=0) up to 310 K (g=0.3). In addition, a large magnetoresistance is revealed which develops below their Curie temperature despite the absence of Mn3+√Mn4+ pairs. A Zener double-exchange interaction is usually used in literature to explain the magnetic and electrical properties of hole-doped perovskite manganites. The data obtained support the mechanism of superexchange interactions between magnetic moments of the manganese ions via oxygen.

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Опубліковано

2001-04-10

Як цитувати

(1)
Trukhanov, S. V.; Troyanchuk, I. O.; Korshunov, F. P.; Sirenko, V. A.; Szymczak, H.; Baerner, K. Effect of Oxygen Content on Magnetization and Magnetoresistance Properties of CMR Manganites. Fiz. Nizk. Temp. 2001, 27, 385-391.

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