Spin Incommensurability and Two Phase Competition in Cobaltites | Zendy

Daniel Phelan | Zendy; Despina Louca | Zendy; Kazuya Kamazawa | Zendy; S.-H. Lee | Zendy; S. Nyborg Ancona | Zendy; Stephan Rosenkranz | Zendy; Yukitoshi Motome | Zendy; M. F. Hundley | Zendy; J. F. Mitchell | Zendy; Yutaka Moritomo | Zendy

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Spin Incommensurability and Two Phase Competition in Cobaltites

Author(s) -

Daniel Phelan,

Despina Louca,

Kazuya Kamazawa,

S.-H. Lee,

S. Nyborg Ancona,

Stephan Rosenkranz,

Yukitoshi Motome,

M. F. Hundley,

J. F. Mitchell,

Yutaka Moritomo

Publication year - 2006

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.97.235501

Subject(s) - condensed matter physics , ferromagnetism , colossal magnetoresistance , spin (aerodynamics) , materials science , neutron scattering , percolation (cognitive psychology) , perovskite (structure) , cluster (spacecraft) , metal–insulator transition , phase (matter) , neutron diffraction , percolation threshold , spin glass , relaxation (psychology) , electrical resistivity and conductivity , scattering , metal , physics , magnetoresistance , magnetic field , diffraction , chemistry , crystallography , computer science , optics , biology , psychology , social psychology , quantum mechanics , metallurgy , thermodynamics , programming language , neuroscience

The perovskite LaCoO3 evolves from a nonmagnetic Mott insulator to a spin cluster ferromagnet (FM) with the substitution of Sr2+ for La3+ in La1-xSrxCoO3. The clusters increase in size and number with x and the charge percolation through the clusters leads to a metallic state. Using elastic neutron scattering on La1-xSrxCoO3 single crystals, we show that an incommensurate spin superstructure coexists with the FM spin clusters. The incommensurability increases continuously with x, with the intensity rising in the insulating phase and dropping in the metallic phase as it directly competes with the commensurate FM, itinerant clusters. The spin incommensurability arises from local order of Co3+-Co4+ clusters but no long-range static or dynamic spin stripes develop. The coexistence and competition of the two magnetic phases explain the residual resistivity at low temperatures in samples with metalliclike transport

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