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Title

Detailed neutron study of the crossover from long-range to short-range magnetic ordering in (Nd1−xTbx)0.55Sr0.45MnO3 manganites

AuthorsTeresa, José María de CSIC ORCID ; Ritter, C.; Algarabel, Pedro A. CSIC ORCID; Yusuf, S. M.; Blasco, Javier CSIC ORCID; Kumar, Amit; Marquina, Clara CSIC ORCID ; Ibarra, M. Ricardo CSIC ORCID
KeywordsNeodymium compounds
Terbium compounds
Strontium compounds
Ferromagnetic materials
Antiferromagnetic materials
Long-range order
Short-range order
Neutron diffraction
Magnetic domains
Ground states
Magnetic transitions
Issue DateDec-2006
PublisherAmerican Physical Society
CitationPhysical Review - Section B - Condensed Matter 74(22): 224442.1-224442.12 (2006)
AbstractWe have applied three complementary neutron techniques (neutron diffraction, neutron depolarization, and small-angle neutron scattering) to investigate the crossover from long-range to short-range magnetic ordering in (Nd1−xTbx)0.55Sr0.45MnO3 manganite compounds. The obtained results indicate that the ground state at T=1.5 K is a long-range C-type canted ferromagnetic state for 0x(Tb)0.5 with ferromagnetic domains larger than several hundreds of nm that decrease as the Tb content increases. In the concentration range 0.5x(Tb)0.6, the ferromagnetic domain size decreases below ~100 nm and these large ferromagnetic clusters coexist in this concentration range with smaller short-range ferromagnetic clusters (around one nanometer size). For x(Tb)0.6, only short-range ferromagnetic and A-type and C-type antiferromagnetic clusters are present and their size is below ~5 nm. The obtained results are discussed in the context of the global phase diagram recently discussed for RE0.55Sr0.45MnO3 and in the context of the quantum critical point features recently suggested in manganites.
Description12 pages, 12 figures, 2 tables.-- PACS number(s): 75.30.Kz, 75.47.Gk, 71.30.+h
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevB.74.224442
URIhttp://hdl.handle.net/10261/19456
DOI10.1103/PhysRevB.74.224442
ISSN1098-0121
Appears in Collections:(ICMA) Artículos

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