Hour-glass magnetic spectrum arising from a striped cluster spin-glass ground state in La1.75Sr0.25CoO4
| Autor: | Matthias Vojta, S. M. Gaw, Christopher D. Frost, D. Prabhakaran, Eric C. Andrade, D. T. Adroja, Andrew T. Boothroyd |
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| Rok vydání: | 2013 |
| Předmět: |
Physics
Spin glass Condensed matter physics Charge (physics) Condensed Matter Physics Condensed Matter::Disordered Systems and Neural Networks Inelastic neutron scattering Electronic Optical and Magnetic Materials Magnetization Spin wave Condensed Matter::Strongly Correlated Electrons Ground state Spin (physics) Excitation |
| Zdroj: | Physical Review B. 88 |
| ISSN: | 1550-235X 1098-0121 |
| DOI: | 10.1103/physrevb.88.165121 |
| Popis: | We report inelastic neutron scattering results that reveal an hour-glass magnetic excitation spectrum in La${}_{1.75}$Sr${}_{0.25}$CoO${}_{4}$. The magnetic spectrum is similar to that observed previously in La${}_{1.67}$Sr${}_{0.33}$CoO${}_{4}$, but the spectral features are broader. We show that the spectrum of La${}_{1.75}$Sr${}_{0.25}$CoO${}_{4}$ can be modelled by the spin dynamics of a system with a disordered cluster spin glass ground state. Bulk magnetization measurements are presented that support the proposed glassy ground state. The observations reiterate the importance of quasi-one-dimensional magnetic correlations and disorder for the hour-glass spectrum, and suggest that disordered spin and charge stripes exist at lower doping in La${}_{2\ensuremath{-}x}$Sr${}_{x}$CoO${}_{4}$ than previously thought. |
| Databáze: | OpenAIRE |
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