Negative thermal expansion and magnetoelastic coupling in the breathing pyrochlore lattice material
Physical Review B, 2018•APS
The physical properties of the spinel LiGaCr 4 S 8 have been studied with neutron
diffraction, x-ray diffraction, magnetic susceptibility, and heat capacity measurements. The
neutron diffraction and synchrotron x-ray diffraction data reveal negative thermal expansion
(NTE) below 111 (4) K. The magnetic susceptibility deviates from Curie-Weiss behavior with
the onset of NTE. At low temperature a broad peak in the magnetic susceptibility at 10.3 (3)
K is accompanied by the return of normal thermal expansion. First-principles calculations …
diffraction, x-ray diffraction, magnetic susceptibility, and heat capacity measurements. The
neutron diffraction and synchrotron x-ray diffraction data reveal negative thermal expansion
(NTE) below 111 (4) K. The magnetic susceptibility deviates from Curie-Weiss behavior with
the onset of NTE. At low temperature a broad peak in the magnetic susceptibility at 10.3 (3)
K is accompanied by the return of normal thermal expansion. First-principles calculations …
The physical properties of the spinel have been studied with neutron diffraction, x-ray diffraction, magnetic susceptibility, and heat capacity measurements. The neutron diffraction and synchrotron x-ray diffraction data reveal negative thermal expansion (NTE) below 111(4) K. The magnetic susceptibility deviates from Curie-Weiss behavior with the onset of NTE. At low temperature a broad peak in the magnetic susceptibility at 10.3(3) K is accompanied by the return of normal thermal expansion. First-principles calculations find a strong coupling between the lattice and the simulated magnetic ground state. These results indicate strong magnetoelastic coupling in .
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