Trends in negative thermal expansion behavior for AMO2 (A=Cu or Ag; M=Al, Sc, In, or La) compounds with the delafossite structure

Li, J.; Sleight, A.W.; Jones, Camille Y.; Toby, B.H.

doi:10.1016/j.jssc.2004.11.017

Cited by 55 publications

(47 citation statements)

References 27 publications

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“…The strong anisotropy of Cu inplane vibrations (Fig. 5-(d,e,f)) at low T is a characteristic feature of delafossite compounds as corroborated by measurements on CuAlO 2 and CuFeO 2 [51,52]. Within the accuracy of the data, we note a possible change in the anisotropy ellipse for Cu vibrations with increasing T in CuCrO 2 , which could reflect the anisotropic expansion/contraction of lattice parameters.…”

Section: Resultssupporting

confidence: 81%

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Lattice dynamics and thermal transport in multiferroicCuCrO2

et al. 2017

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Inelastic neutron and x-ray scattering measurements of phonons and spin waves were performed in the delafossite compound CuCrO2 over a wide range of temperature, and complemented with first-principles lattice dynamics simulations. The phonon dispersions and density of states are well reproduced by our density functional calculations, and reveal a strong anisotropy of Cu vibrations, which exhibit low-frequency modes of large amplitude parallel to the basal plane of the layered delafossite structure. The low frequency in-plane modes also show a systematic temperature dependence of neutron and x-ray scattering intensities. In addition, we find that spin fluctuations persist above 300 K, far above the Néel temperature for long-range antiferromagnetic order, T N ≃ 24 K. Our modeling of the thermal conductivity, based on our phonon measurements and simulations, reveals a significant anisotropy and indicates that spin fluctuations above T N constitute an important source of phonon scattering, considerably suppressing the thermal conductivity compared to that of the isostructural but non-magnetic compound CuAlO2.

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Section: Resultssupporting

confidence: 81%

“…Previous studies (Ref. 10) and our own neutron diffraction measurements show that CuCrO 2 exhibits a contraction in c lattice parameter between 0 K and 300 K, which is considerably larger (two to ten times larger) than in other nonmagnetic delafossite compounds (AM O 2 -A = Cu, Ag; M = Al, Sc, In, or La) [51]. In addition, by comparing Fig.…”

Section: Resultsmentioning

confidence: 50%

Lattice dynamics and thermal transport in multiferroicCuCrO2

et al. 2017

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“…Some of these compounds with B as magnetic trivalent cation (Fe or Cr) includes CuFeO 2, CuCrO 2, AgCrO 2, belong to the magnetoelectric multiferroics and at low temperature they undergo a series of magnetic phase transitions as a result of geometrical frustration of magnetic ions on triangular lattice [23,24]. Interestingly a few of these compounds like CuScO 2 , CuLaO 2 , CuInO 2 , CuAlO 2 show negative thermal expansion (NTE) behaviour as revealed by neutron scattering measurements [25,26]. This behaviour is found to be stronger in CuScO 2 and CuLaO 2 and is attributed to the anharmonicity of linear O-Cu-O bond along the c-axis.…”

Section: Introductionmentioning

confidence: 99%

Multiferroic CuCrO2 under high pressure: In situ X-ray diffraction and Raman spectroscopic studies

Garg

Mishra

Pandey

et al. 2014

Journal of Applied Physics

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“…Ishiguro et al [11] found that the thermal expansion coefficient (TEC) at a axis in CuAlO 2 was 11.0 Â 10 À 6 K À 1 , which was about three times that at the c axis. Recently, Li et al [12] further proved that CuAlO 2 exhibits negative TEB along the c axis (TEC, -3.2 Â 10 À 6 K À 1 ) in the below 500 K condition, which was attributed to the symmetrical O-Cu-O dumbbell units arrayed in the c axis. Above 500 K, the competition between Al-O bonds with the positive TEB and O-Cu-O units with the negative TEB resulted in an overall positive TEB along the c axis.…”

Section: Resultsmentioning

confidence: 99%