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| 001 | 9354 | ||
| 005 | 20250129094304.0 | ||
| 024 | 7 | _ | |a 10.1103/PhysRevB.81.144502 |2 DOI |
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| 084 | _ | _ | |2 WoS |a Physics, Condensed Matter |
| 100 | 1 | _ | |0 P:(DE-HGF)0 |a Mittal, R. |b 0 |
| 245 | _ | _ | |a Pressure dependence of phonon modes across the tetragonal to collapsed tetragonal phase transition in CaFe2As2 |
| 260 | _ | _ | |a College Park, Md. |b APS |c 2010 |
| 300 | _ | _ | |a 144502 |
| 336 | 7 | _ | |a Journal Article |0 PUB:(DE-HGF)16 |2 PUB:(DE-HGF) |
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| 440 | _ | 0 | |0 4919 |a Physical Review B |v 81 |x 1098-0121 |y 14 |
| 500 | _ | _ | |a Record converted from VDB: 12.11.2012 |
| 520 | _ | _ | |a The pressure dependence of a large number of phonon modes in CaFe2As2 with energies covering the full range of the phonon spectrum has been studied using inelastic x-ray and neutron scatterings. The pressure range was large enough to cover the first-order phase transition into the so-called collapsed phase where the c-axis contracts by about 6% whereas a and b axes expand by about 1.5%. Our main result is that pressure-induced phonon frequency shifts are well explained by the changes in relevant bond lengths throughout the pressure range, including those associated with the first-order phase transition. Specifically, the frequencies of phonons polarized in the ab plane as well as the Fe-As bond lengths change little across the phase transition. On the other hand, the transverse-acoustic phonons propagating along the c direction stiffen very significantly in response to the large contraction of the bonds along the c axis. Nonmagnetic density-functional calculations describe the frequencies in both the zero pressure and in the collapsed phase in a satisfactory way if based on the respective experimental crystal structures. This suggests that there is no need to invoke changes in magnetic moments on Fe atoms to explain the pressure-induced frequency shifts. |
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| 700 | 1 | _ | |0 P:(DE-HGF)0 |a Forrest, T.R. |b 3 |
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| 700 | 1 | _ | |0 P:(DE-HGF)0 |a Lamago, D. |b 5 |
| 700 | 1 | _ | |0 P:(DE-HGF)0 |a Reznik, D. |b 6 |
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| 700 | 1 | _ | |0 P:(DE-Juel1)130991 |a Su, Y. |b 8 |u FZJ |
| 700 | 1 | _ | |0 P:(DE-Juel1)VDB84209 |a Kumar, C. M. N. |b 9 |u FZJ |
| 700 | 1 | _ | |0 P:(DE-HGF)0 |a Dhar, S.K. |b 10 |
| 700 | 1 | _ | |0 P:(DE-HGF)0 |a Thamizhavel, A. |b 11 |
| 700 | 1 | _ | |0 P:(DE-HGF)0 |a Rueegg, Ch. |b 12 |
| 700 | 1 | _ | |0 P:(DE-HGF)0 |a Krisch, M. |b 13 |
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| 700 | 1 | _ | |0 P:(DE-HGF)0 |a Pintschovius, L. |b 16 |
| 773 | 1 | 8 | |a 10.1103/physrevb.81.144502 |b American Physical Society (APS) |d 2010-04-06 |n 14 |p 144502 |3 journal-article |2 Crossref |t Physical Review B |v 81 |y 2010 |x 1098-0121 |
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