1998
DOI: 10.1021/cm970712x
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Far-Infrared Studies of Spin-Peierls Materials in a Magnetic Field

Abstract: We report the low-temperature far-infrared response of two prototypical spin-Peierls (SP) materials as a function of magnetic field in order to characterize the microscopic nature of the SP and high-field incommensurate phases. For the linear chain inorganic compound, GeCuO 3 , we observe that the B 3u shearing mode is sensitive to the high-field phase boundary in the H-T phase diagram, and we find Zeeman splitting of the zone-center spin-Peierls gap within the dimerized phase. In contrast, for the organic mol… Show more

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Cited by 4 publications
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“…CuGeO 3 is well-known as the first inorganic spin-Peierls material and, as such, is a superb platform for exploring temperature, magnetic field, pressure, and doping effects. This system consists of edge-sharing CuO 6 octahedra that form quasi-one-dimensional chains along the crystallographic c -axis (Figure a). , The Cu centers are d 9 and therefore S = 1/2. The Cu atoms dimerize below the T SP = 14 K spin-Peierls transition, and spin gaps open because singlets are formed. , Vibrational spectroscopies reveal the coupled phonons. , The recent development of a suite of CuGeO 3 nanorods of different lengths (Figure b–d) offers the opportunity to unravel size effects on the dynamic properties and at the same time explore how and why the spin-Peierls transition is suppressed below a critical size ( d crit ≈ 450 nm). , Electron spin resonance reveals no sign of an antiferromagnetic state at small sizes, contrary to expectations based upon chemical substitution with Si, Zn, and Mg. Instead, disorder emanating from the small surface layer and local changes in the Cu–O–Cu superexchange pathway that increase interchain interactions may place CuGeO 3 nanorods in the vicinity of a disorder-driven quantum critical point …”
mentioning
confidence: 99%
“…CuGeO 3 is well-known as the first inorganic spin-Peierls material and, as such, is a superb platform for exploring temperature, magnetic field, pressure, and doping effects. This system consists of edge-sharing CuO 6 octahedra that form quasi-one-dimensional chains along the crystallographic c -axis (Figure a). , The Cu centers are d 9 and therefore S = 1/2. The Cu atoms dimerize below the T SP = 14 K spin-Peierls transition, and spin gaps open because singlets are formed. , Vibrational spectroscopies reveal the coupled phonons. , The recent development of a suite of CuGeO 3 nanorods of different lengths (Figure b–d) offers the opportunity to unravel size effects on the dynamic properties and at the same time explore how and why the spin-Peierls transition is suppressed below a critical size ( d crit ≈ 450 nm). , Electron spin resonance reveals no sign of an antiferromagnetic state at small sizes, contrary to expectations based upon chemical substitution with Si, Zn, and Mg. Instead, disorder emanating from the small surface layer and local changes in the Cu–O–Cu superexchange pathway that increase interchain interactions may place CuGeO 3 nanorods in the vicinity of a disorder-driven quantum critical point …”
mentioning
confidence: 99%