Hour-glass magnetic spectrum arising from a striped cluster spin-glass ground state in La1.75Sr0.25CoO4

S. M. Gaw; E. C. Andrade; M. Vojta; C. D. Frost; D. T. Adroja; D. Prabhakaran; A. T. Boothroyd

doi:10.1103/PhysRevB.88.165121

Hour-glass magnetic spectrum arising from a striped cluster spin-glass ground state in La_1.75Sr_0.25CoO₄

S. M. Gaw, E. C. Andrade, M. Vojta, C. D. Frost, D. T. Adroja, D. Prabhakaran, A. T. Boothroyd

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

We report inelastic neutron scattering results that reveal an hour-glass magnetic excitation spectrum in La_1.75Sr_0.25CoO ₄. The magnetic spectrum is similar to that observed previously in La_1.67Sr_0.33CoO₄, but the spectral features are broader. We show that the spectrum of La_1.75Sr _0.25CoO₄ 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-xSr_xCoO₄ than previously thought.

Original language	English
Article number	165121
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	88
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevB.88.165121
Publication status	Published - 14 Oct 2013
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.88.165121

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title = "Hour-glass magnetic spectrum arising from a striped cluster spin-glass ground state in La1.75Sr0.25CoO4",

abstract = "We report inelastic neutron scattering results that reveal an hour-glass magnetic excitation spectrum in La1.75Sr0.25CoO 4. The magnetic spectrum is similar to that observed previously in La1.67Sr0.33CoO4, but the spectral features are broader. We show that the spectrum of La1.75Sr 0.25CoO4 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-xSrxCoO4 than previously thought.",

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AU - Gaw, S. M.

AU - Andrade, E. C.

AU - Vojta, M.

AU - Frost, C. D.

AU - Adroja, D. T.

AU - Prabhakaran, D.

AU - Boothroyd, A. T.

PY - 2013/10/14

Y1 - 2013/10/14

N2 - We report inelastic neutron scattering results that reveal an hour-glass magnetic excitation spectrum in La1.75Sr0.25CoO 4. The magnetic spectrum is similar to that observed previously in La1.67Sr0.33CoO4, but the spectral features are broader. We show that the spectrum of La1.75Sr 0.25CoO4 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-xSrxCoO4 than previously thought.

AB - We report inelastic neutron scattering results that reveal an hour-glass magnetic excitation spectrum in La1.75Sr0.25CoO 4. The magnetic spectrum is similar to that observed previously in La1.67Sr0.33CoO4, but the spectral features are broader. We show that the spectrum of La1.75Sr 0.25CoO4 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-xSrxCoO4 than previously thought.

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Hour-glass magnetic spectrum arising from a striped cluster spin-glass ground state in La_1.75Sr_0.25CoO₄

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