Structure and Transport Properties of La_{0.75-x}RE_xCa_{0.25}MnO_3 (RE = Gd, Dy, Ho; 0≤ x≤0.75) Manganites

• Authors: V. Drozd , M. Pękała , J. Kovac , I. Skorvanek , M. Szymański , S. Nedilko
• Languages of publication: EN

Abstracts

EN

Structure and transport properties have been studied for a series of La_{0.75-x}RE_xCa_{0.25}MnO_3 manganites with heavy rare earth ions of Gd, Dy, Ho substituting La with x=0, 0.10, 0.25, 0.50, and 0.75. Polycrystalline samples were prepared by the carbonate precipitation route. The oxygen content was determined by the iodometric titration. The X-ray investigations carried out by the powder method show that the unit cell volume gradually decreases and orthorhombic distortion of the lattice increases with rising RE content. Below the room temperature the electrical resistivity is of the semiconducting type for all the samples studied. Electrical resistivity vs. temperature dependences were analyzed within different models: simple thermal activation, Mott's variable range hopping, adiabatic, nonadiabatic, and bipolaron. The Curie temperatures of Gd, Dy, and Ho substituted manganites determined from magnetization measurements show that at 280 K all the samples are in the paramagnetic phase. The increasing RE fraction reduces magnetization at 4 K as compared to La_{0.75}Ca_{0.25}MnO_3.

Keywords

EN

75.47.Lx; 71.38.-k; 72.20.Ee; 75.50.Dd

Discipline

• 75.50.Dd: Nonmetallic ferromagnetic materials
• 72.20.Ee: Mobility edges; hopping transport
• 75.47.Lx: Magnetic oxides
• 71.38.-k: Polarons and electron-phonon interactions(see also 63.20.K- Phonon interactions in lattice dynamics)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2004
• Volume: 106
• Issue: 5
• Pages: 751-758

Dates

published

2004-11

received

2004-06-06

Contributors

author

V. Drozd

• Department of Chemistry, Kiev State University, Kiev, Ukraine

author

M. Pękała

• Department of Chemistry, Warsaw University, Pasteura 1, 02-093 Warsaw, Poland

author

J. Kovac

• Institute of Experimental Physics, SAS, Kosice, Slovakia

author

I. Skorvanek

• Institute of Experimental Physics, SAS, Kosice, Slovakia

author

M. Szymański

• Institute of Experimental Physics, Warsaw University, Warsaw, Poland

author

S. Nedilko

• Department of Chemistry, Kiev State University, Kiev, Ukraine

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Identifiers

DOI

10.12693/APhysPolA.106.751