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Schöttl, Stephan; Siemensmeyer, K.; Boyko, V. M.; Baťko, I.; Maťaš, S.; Raasch, Sebastian; Sherline, Todd E.

doi:10.1023/a:1013706615235

Cited by 2 publications

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“…[2,8] Recently, however, the use of inelastic X-ray scattering [9,10] offers the possibility of experimentally determining the phonon branches of 3 He. In addition, new neutron scattering experiments are being planned, [11,12] which will be able to acquire data for a sufficiently long time to observe inelastic scattering. The present study has been motivated by these developments.…”

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Path-Integral Monte Carlo Study of Phonons in the bcc Phase of 3He

2006

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Using Path Integral Monte Carlo and the Maximum Entropy method, we calculate the dynamic structure factor of solid 3 He in the bcc phase at a finite temperature of T = 1.6 K and a molar volume of 21.5 cm 3 . From the single phonon dynamic structure factor, we obtain both the longitudinal and transverse phonon branches along the main crystalline directions, [001], [011] and [111]. Our results are compared with other theoretical predictions and available experimental data.Keywords quantum solid · Path Integral Monte Carlo · Maximum Entropy method · phonon spectrum · solid helium PACS 67.80.-s · 05.10.Ln · 63.20.Dj IntroductionThe two isotopes of solid helium, 3 He and 4 He, are the most prominent examples of quantum solids [2,3]. These isotopes display highly anharmonic dynamics: their atoms are strongly correlated, loosely bound and make large excursions to the nearest neighbor sites. The effects are especially significant in the bcc phase of solid helium.

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