Changes in the magnetic structure of (La0.25Pr0.75)0.7Ca0.3MnO 3 upon the isotopic substitution of 18O for 16O

A. M. Balagurov, V. Yu Pomyakushin, D. V. Sheptyakov, V. Aksenov, N. A. Babushkina, A. M. Belova, A. N. Taldenkov, A. V. Inyushkin, P. Fischer, M. Gutmann, L. Keller, O. Yu Gorbenko, V. A. Amelichev, A. R. Kaul'

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Abstract

A giant isotope effect, wherein the low-temperature metallic state is replaced by an insulator state, was recently observed when 18O was substituted for 16O in (La0.25Pr0.75)0.7Ca0.3MnO 3 [N. A. Babushkina, L. M. Belova, O. Yu. Gorbenko et al., Nature (London) 391, 159 (1998)]. In the present work, the temperature evolution of the magnetic structure of two samples of this compound is studied by neutron diffraction. One sample contained a natural mixture of oxygen isotopes, 99.7% 16O, while the other was enriched to 75% with the isotope 18O. It is established that the samples are crystallographically identical at room temperature. As the temperature decreases, the sample with 16O undergoes successive antiferromagnetic (TAFM = 150 K) and ferromagnetic (TFM = 110 K) transitions, which lead to the establishment of a noncollinear ferromagnetic structure, while a purely antiferromagnetic (TAFM = 150 K) order arises in the sample with 18O. The temperature dependences of the intensities of the diffraction peaks associated with the charge ordering differ substantially in samples with 16O and 18O, and they correlate with the behavior of their electric resistance and magnetic structure.

Original languageEnglish
Pages (from-to)50-56
Number of pages7
JournalJETP Letters
Volume69
Issue number1
Publication statusPublished - Jan 10 1999

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substitutes
oxygen isotopes
isotope effect
neutron diffraction
isotopes
insulators
temperature dependence
temperature
room temperature
diffraction

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Balagurov, A. M., Pomyakushin, V. Y., Sheptyakov, D. V., Aksenov, V., Babushkina, N. A., Belova, A. M., ... Kaul', A. R. (1999). Changes in the magnetic structure of (La0.25Pr0.75)0.7Ca0.3MnO 3 upon the isotopic substitution of 18O for 16O. JETP Letters, 69(1), 50-56.

Changes in the magnetic structure of (La0.25Pr0.75)0.7Ca0.3MnO 3 upon the isotopic substitution of 18O for 16O. / Balagurov, A. M.; Pomyakushin, V. Yu; Sheptyakov, D. V.; Aksenov, V.; Babushkina, N. A.; Belova, A. M.; Taldenkov, A. N.; Inyushkin, A. V.; Fischer, P.; Gutmann, M.; Keller, L.; Gorbenko, O. Yu; Amelichev, V. A.; Kaul', A. R.

In: JETP Letters, Vol. 69, No. 1, 10.01.1999, p. 50-56.

Research output: Contribution to journalArticle

Balagurov, AM, Pomyakushin, VY, Sheptyakov, DV, Aksenov, V, Babushkina, NA, Belova, AM, Taldenkov, AN, Inyushkin, AV, Fischer, P, Gutmann, M, Keller, L, Gorbenko, OY, Amelichev, VA & Kaul', AR 1999, 'Changes in the magnetic structure of (La0.25Pr0.75)0.7Ca0.3MnO 3 upon the isotopic substitution of 18O for 16O', JETP Letters, vol. 69, no. 1, pp. 50-56.
Balagurov AM, Pomyakushin VY, Sheptyakov DV, Aksenov V, Babushkina NA, Belova AM et al. Changes in the magnetic structure of (La0.25Pr0.75)0.7Ca0.3MnO 3 upon the isotopic substitution of 18O for 16O. JETP Letters. 1999 Jan 10;69(1):50-56.
Balagurov, A. M. ; Pomyakushin, V. Yu ; Sheptyakov, D. V. ; Aksenov, V. ; Babushkina, N. A. ; Belova, A. M. ; Taldenkov, A. N. ; Inyushkin, A. V. ; Fischer, P. ; Gutmann, M. ; Keller, L. ; Gorbenko, O. Yu ; Amelichev, V. A. ; Kaul', A. R. / Changes in the magnetic structure of (La0.25Pr0.75)0.7Ca0.3MnO 3 upon the isotopic substitution of 18O for 16O. In: JETP Letters. 1999 ; Vol. 69, No. 1. pp. 50-56.
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N2 - A giant isotope effect, wherein the low-temperature metallic state is replaced by an insulator state, was recently observed when 18O was substituted for 16O in (La0.25Pr0.75)0.7Ca0.3MnO 3 [N. A. Babushkina, L. M. Belova, O. Yu. Gorbenko et al., Nature (London) 391, 159 (1998)]. In the present work, the temperature evolution of the magnetic structure of two samples of this compound is studied by neutron diffraction. One sample contained a natural mixture of oxygen isotopes, 99.7% 16O, while the other was enriched to 75% with the isotope 18O. It is established that the samples are crystallographically identical at room temperature. As the temperature decreases, the sample with 16O undergoes successive antiferromagnetic (TAFM = 150 K) and ferromagnetic (TFM = 110 K) transitions, which lead to the establishment of a noncollinear ferromagnetic structure, while a purely antiferromagnetic (TAFM = 150 K) order arises in the sample with 18O. The temperature dependences of the intensities of the diffraction peaks associated with the charge ordering differ substantially in samples with 16O and 18O, and they correlate with the behavior of their electric resistance and magnetic structure.

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