Nuclear forward and inelastic spectroscopy on ¹²⁵ Te and Sb ₂ ¹²⁵ Te ₃

Abstract

PACS 23.20.Lv-γ transitions and level energies PACS 29.30.Kv-X-and γ-ray spectroscopy PACS 63.20.D-Phonon states and bands, normal modes, and phonon dispersion Abstract-We report on the observation of nuclear forward and nuclear inelastic scattering of synchrotron radiation by 125 Te and the application of both spectroscopic methods to tellurium compounds by using a high-resolution backscattering sapphire monochromator in combination with fast detection electronics. The lifetime of the nuclear resonance and the energy of the transition were determined to be 2.131(12) ns and 35493.12(30) eV, respectively. As applications, the nuclear inelastic spectrum in Sb2Te3 and the nuclear forward scattering by Te metal were measured. These measurements open the field of nuclear resonance spectroscopy on tellurium compounds such as thermoelectric and superconducting materials.

Lattice dynamics in Bi2Te3and Sb2TeBessas1, Sergueev2, Wille3 et al. 2012Phys. Rev. BSelf Cite

“…3. In this work, the instrumental resolution was improved to 1.1 meV for 125 Te and 1.3 meV for 121 Sb with respect to 6.5 and 4.5 meV in the first demonstration of 125 Te and 121 Sb NIS, 18,19 respectively. After subtraction of the elastic peak, a modified version 33 of the program DOS 34 was used to extract the density of phonon states.…”

“…Herein, we report both on the macroscopic characterization of Bi 2 Te 3 and Sb 2 Te 3 based on heat capacity measurements and on the microscopic characterization by synchrotron radiation diffraction and 121 Sb 18 and 125 Te 19 NIS. The combination of the Te DPS measured by NIS and the total DPS measured by inelastic neutron scattering 20 in Bi 2 Te 3 allows us to obtain an approximative Bi DPS and to perform an elemental comparison for both compounds.…”

Nuclear resonant scattering of synchrotron radiation: Applications in magnetism of layered structures

“…Table 1 provides a list of these isotopes, whereby 121 Sb [16] and 125 Te [17] are the most recent additions. …”

Rocking curve imaging of high quality sapphire crystals in backscattering geometry

“…Several nuclear transitions with energies above 30 keV can be investigated by NIS, in particular, the transitions of 125 Te at an energy of 35.49 keV, 15,16 of 121 Sb at 37.13 keV, 16,17 and of 129 Xe 18 at 39.6 keV. Theoretical calculations 13 predict for the sapphire backscattering monochromator an energy bandwidth of 0.3-0.7 meV, i.e., dE=E ¼ 1-2 Â 10 À8 for these energies.…”

“…20 In 2007, NIS at the same energy with an improved resolution of 4.5 meV was reported. 17 NIS experiments at 35.49 keV a) ( 125 Te nuclear transition) have been carried out with 7.5 and 6.6 meV energy resolution at BL09XU at SPring-8 21 and at the nuclear resonance scattering station ID22N, ESRF, 15 respectively. Thus, attempts to use sapphire as a high resolution monochromator for NIS show that the main limiting factor is the quality of available crystals, which is ten times worse than the theoretical expectation.…”