1981
DOI: 10.1016/0038-1098(81)90015-6
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Observation of new Raman lines in GeSe and SnSe at low temperatures

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Cited by 43 publications
(41 citation statements)
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“…3, the pronounced sublinear pressure response of the RL A g shear mode results from pressure-enhanced mode mixing of a nearly RL vibration. This pressure-induced breakdown of the RL approximation can be found in other [15] at 20 K, c [16] at 20 K, d present work at 10 K. RL modes (e.g. compressive B 2g mode) with symmetry-allowed coupling of eigenvector components.…”
Section: Vibrational Response In Anisotropic Solidssupporting
confidence: 81%
See 1 more Smart Citation
“…3, the pronounced sublinear pressure response of the RL A g shear mode results from pressure-enhanced mode mixing of a nearly RL vibration. This pressure-induced breakdown of the RL approximation can be found in other [15] at 20 K, c [16] at 20 K, d present work at 10 K. RL modes (e.g. compressive B 2g mode) with symmetry-allowed coupling of eigenvector components.…”
Section: Vibrational Response In Anisotropic Solidssupporting
confidence: 81%
“…As a prototype of quasi-two-dimensional layered materials, the isostructural semiconductors GeS and GeSe adopt a double-layered orthorhombic crystal structure with space group Pcmn (D 16 2h at ambient pressure [1 to 5] . Choosing the c-axis to be perpendicular to the plane of layers, the locations of the four Ge (or chalcogen) atoms are defined by the additional specification of two free atomic positional parameters (u and v) and are expressed as AEuY 1 4 Y v and AE 1 2 À uY 1 4 Y 1 2 v. On the other hand, the ambient structure of the quasi-molecular crystal AsI 3 is rhombohedral with space group C 2 3i (R " 3) [4,5].…”
Section: Introductionmentioning
confidence: 99%
“…Nevertheless, it is important to keep in mind the effecto fs uch al arge change of strain at high temperatures, for example, in the mechanical stability of thermoelectric devices. [20] As pointed out by some of the same authors of the aforementioned studies, no indications of any structural phase transition have been found by meanso fd iffractiont echniques. This infers that some kind of structural rearrangement, for example, rearrangement of defects, takes place in the same range of temperature at which Wiedemeier and Siemers report thermala nomalies.…”
Section: Resultsmentioning
confidence: 91%
“…The clearly observed peaks at 83 and 188cm -1 are associated with the Ag 1 and Ag 2 modes, while the peak at 151cm -1 is assigned to B3g mode; a result in good agreement with previous work. 22,23 Figure 3d shows the measured and fitted intensity of Ag and B3g modes as a function of the angle between the incident light polarization and the receiver polarizer, α. We can see that the intensities of Ag and B3g modes have a variation period of 180 o .…”
Section: Polarized Raman and Crystal Orientationmentioning
confidence: 99%