skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Negative Oxygen Isotope Effect in Manganites with an Ordered Cation Arrangement in a High Magnetic Field

Abstract

The oxygen isotope effect in PrBaMn{sub 2}{sup 16-18} O{sub 5.97} manganite with an ordered cation arrangement is studied. The field dependences of magnetic susceptibility and magnetization are measured in the temperature range 100–270 K and magnetic fields up to 32 T. A significant increase in the temperature of the spin-reorientation antiferromagnet–ferromagnet phase transition is detected in samples enriched in heavy oxygen {sup 18}O (negative isotope effect). The transition temperature and the isotope effect depend strongly on the magnetic field. An H–T phase diagram is plotted for samples with various isotope compositions. An analysis of the experimental results demonstrates that the detected negative isotope effect and the giant positive isotope effect revealed earlier in doped manganites have the same nature. The mechanisms of appearance of isotope effects are discussed in terms of the double exchange model under a polaron narrowing of the free carrier band.

Authors:
 [1];  [2];  [1]; ;  [3]
  1. Russian Research Centre “Kurchatov Institute,” (Russian Federation)
  2. Moscow State University, Physical Faculty (Russian Federation)
  3. Moscow State University, Chemical Faculty (Russian Federation)
Publication Date:
OSTI Identifier:
22749977
Resource Type:
Journal Article
Journal Name:
Journal of Experimental and Theoretical Physics
Additional Journal Information:
Journal Volume: 126; Journal Issue: 3; Other Information: Copyright (c) 2018 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-7761
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CATIONS; DOPED MATERIALS; ISOTOPE EFFECTS; ISOTOPE RATIO; MAGNETIC FIELDS; MAGNETIC SUSCEPTIBILITY; MAGNETIZATION; PHASE DIAGRAMS; PHASE TRANSFORMATIONS; QUANTUM MECHANICS; TEMPERATURE RANGE 0065-0273 K; TRANSITION TEMPERATURE

Citation Formats

Taldenkov, A. N., E-mail: box-n3@bk.ru, Snegirev, V. V., Babushkina, N. A., Kalitka, V. S., and Kaul’, A. R. Negative Oxygen Isotope Effect in Manganites with an Ordered Cation Arrangement in a High Magnetic Field. United States: N. p., 2018. Web. doi:10.1134/S106377611803010X.
Taldenkov, A. N., E-mail: box-n3@bk.ru, Snegirev, V. V., Babushkina, N. A., Kalitka, V. S., & Kaul’, A. R. Negative Oxygen Isotope Effect in Manganites with an Ordered Cation Arrangement in a High Magnetic Field. United States. doi:10.1134/S106377611803010X.
Taldenkov, A. N., E-mail: box-n3@bk.ru, Snegirev, V. V., Babushkina, N. A., Kalitka, V. S., and Kaul’, A. R. Thu . "Negative Oxygen Isotope Effect in Manganites with an Ordered Cation Arrangement in a High Magnetic Field". United States. doi:10.1134/S106377611803010X.
@article{osti_22749977,
title = {Negative Oxygen Isotope Effect in Manganites with an Ordered Cation Arrangement in a High Magnetic Field},
author = {Taldenkov, A. N., E-mail: box-n3@bk.ru and Snegirev, V. V. and Babushkina, N. A. and Kalitka, V. S. and Kaul’, A. R.},
abstractNote = {The oxygen isotope effect in PrBaMn{sub 2}{sup 16-18} O{sub 5.97} manganite with an ordered cation arrangement is studied. The field dependences of magnetic susceptibility and magnetization are measured in the temperature range 100–270 K and magnetic fields up to 32 T. A significant increase in the temperature of the spin-reorientation antiferromagnet–ferromagnet phase transition is detected in samples enriched in heavy oxygen {sup 18}O (negative isotope effect). The transition temperature and the isotope effect depend strongly on the magnetic field. An H–T phase diagram is plotted for samples with various isotope compositions. An analysis of the experimental results demonstrates that the detected negative isotope effect and the giant positive isotope effect revealed earlier in doped manganites have the same nature. The mechanisms of appearance of isotope effects are discussed in terms of the double exchange model under a polaron narrowing of the free carrier band.},
doi = {10.1134/S106377611803010X},
journal = {Journal of Experimental and Theoretical Physics},
issn = {1063-7761},
number = 3,
volume = 126,
place = {United States},
year = {2018},
month = {3}
}