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Field-induced phase transitions in isotope enriched Sm1−xSrxMn16,18O3

✍ Scribed by A. Babushkina; A. Taldenkov; O. Gorbenko; A. Kaul; G. Fedorov; H. Rakoto; J.M. Broto

Publisher
Elsevier Science
Year
2004
Tongue
English
Weight
371 KB
Volume
346-347
Category
Article
ISSN
0921-4526

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✦ Synopsis

Doped perovskite manganites Ln 1Àx ðCa; SrÞ x MnO 3 are characterised by strong interplay of electron, lattice and spin degrees of freedom. Its ground state ranges from antiferromagnetic insulator to a ferromagnetic metal and strongly depends on many parameters such as temperature, external field, chemical composition, oxygen isotope content, etc. In this work magnetic properties of the compound Sm 1Àx Sr x Mn 16 O 3 together with its isotopically substituted counterpart Sm 1Àx Sr x Mn 18 O 3 (90% of 18 O 2 ) were studied under magnetic field up to 35 T in the temperature range 4-250 K: We have performed magnetisation and susceptibility isothermal field scans alongside with study of transport properties. Several sharp magnetic phase transitions were observed, and H-T phase diagram was reconstructed. It was found that oxygen isotope substitution 16 O-18 O significantly modifies the phase diagram in such a way, that the transition fields shift up to the higher values in the samples with the heavier oxygen masses.

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