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| 2. |
- Jana, Somnath, et al.
(författare)
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LaSrVMoO6 : A case study for A-site covalency-driven local cationic order in double perovskites
- 2012
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Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 86:1
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Tidskriftsartikel (refereegranskat)abstract
- An unusual atomic scale chemical fluctuation in LaSrVMoO6, in terms of narrow patches of La, V and Sr,Mo-rich phases, has been probed in detail to understand the origin of such a chemical state. Exhaustive tuning of the equilibrium synthesis parameters showed that the extent of phase separation can never be melted down below a unit cell dimension making it impossible to achieve the conventional B-site ordered structure, which establishes that the observed "inhomogeneous" patchlike structure with minimum dimension of few angstroms is a reality in LaSrVMoO6. Therefore another type of local chemical order, hitherto unknown in double perovskites, gets introduced here. X-ray diffraction, electron microscopy elemental mapping, magnetic, and various spectroscopic studies have been carried out on samples, synthesized under different conditions. These experimental results in conjunction with ab initio electronic structure calculation revealed that it is the energy stability, gained by typical La-O covalency as in LaVO3, that leads to the preferential La, V and Sr,Mo ionic proximity, and the consequent patchy structure.
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| 3. |
- Nag, Somnath, et al.
(författare)
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Collective and noncollective states in (120)Te
- 2012
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Ingår i: Physical Review C (Nuclear Physics). - 0556-2813. ; 85:1
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Tidskriftsartikel (refereegranskat)abstract
- High-spin states in (120)Te were populated in the reaction (80)Se((48)Ca, alpha 4n)(120)Te at a beam energy of 207 MeV and gamma-ray coincidences were measured using the Gammasphere spectrometer. The previously known level scheme is extended to higher spin and new interband transitions and side-feeding branches are established. Five highly deformed rotational bands, extending up to almost I = 50, are observed for the first time. The bands are compared with similar structures found recently in neighboring nuclei. The experimental results are interpreted within the framework of the cranked Nilsson-Strutinsky model. Configuration assignments to several terminating states and to the high-spin bands are discussed.
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| 4. |
- Singh, Purnima, et al.
(författare)
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High-spin spectroscopy of I-122
- 2012
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Ingår i: Physical Review C (Nuclear Physics). - 0556-2813. ; 85:5
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Tidskriftsartikel (refereegranskat)abstract
- High-spin states in I-122 have been investigated using the Cd-116(B-11,5n)I-122 reaction at a beam energy of 65 MeV and gamma-ray coincidence events were recorded with the INGA spectrometer. The level scheme of I-122 has been extended up to spin I = 30. Experimental features, such as band-crossing frequencies, aligned angular momenta, signature splitting, and B(M1)/B(E2) ratios have been used for configuration assignments to low-energy band structures. Maximally aligned states involving all eight particles outside the Sn-114 core and states with one particle antialigned have been identified. Cranked Nilsson-Strutinsky calculations have been used to interpret high-spin structures.
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