Muon spin relaxation and susceptibility measurements of an itinerant-electron system Sr 1-xCa xRuO 3: Quantum evolution from ferromagnet to paramagnet

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DOIResolve DOI: http://doi.org/10.1103/PhysRevB.84.224415
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TypeArticle
Journal titlePhysical Review B - Condensed Matter and Materials Physics
ISSN1098-0121
Volume84
Issue22
Article number224415
AbstractMuon spin relaxation (μSR) and magnetic susceptibility measurements have been performed in the itinerant-electron magnet Sr 1-xCa xRuO 3, with x= 0.0, 0.3, 0.5, 0.65, 0.7, 0.75, 0.8, 0.9, and 1.0. SrRuO 3 is a ferromagnet with the critical temperature T c∼160 K. Upon (Sr, Ca) substitution, T c decreases monotonically with increasing Ca concentration x and the ferromagnetic order disappears around x= 0.7. Very weak static magnetism is observed in the x= 0.75 and 0.8 systems, while the x= 0.9 and 1.0 systems remain paramagnetic in their full volume. Phase separation between volumes with and without static magnetism was observed in the x= 0.65, 0.7, 0.75, and 0.8 systems, near the magnetic crossover around x= 0.7. In this concentration region, μSR measurements revealed discontinuous evolution of magnetic properties in contrast to magnetization measurements, which exhibit seemingly continuous evolution. Unlike the volume-integrated magnetization measurements, μSR can separate the effects of the ordered moment size and the volume fraction of magnetically ordered regions. The muon spin relaxation rate 1/T 1 exhibits critical slowing down of spin fluctuations near T c in the ferromagnetic systems with x= 0.0-0.65, consistent with the behavior expected in the self-consistent renormalization theory of itinerant electron ferromagnets. The lack of maximum of 1/T 1 in the x= 0.7 system indicates the disappearance of critical slowing down. These results demonstrate a first-order quantum evolution in the ferromagnet to paramagnet crossover near x= 0.7. © 2011 American Physical Society.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Canadian Neutron Beam Centre (CNBC-CCFN)
Peer reviewedYes
NPARC number21271296
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Record identifierf1cd6768-501d-4162-a2e0-ebb5ad388f70
Record created2014-03-24
Record modified2016-05-09
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