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Título: | Solid para-hydrogen as the paradigmatic quantum crystal: Three observables probed by ultrahigh-resolution neutron spectroscopy |
Autor: | Fernández-Alonso, Félix CSIC ORCID; Cabrillo García, Carlos CSIC ORCID; Fernández-Perea, Ricardo CSIC ORCID; Bermejo, Francisco Javier CSIC ORCID; González, M. A.; Mondelli, Claudia; Farhi, Emmanuel | Fecha de publicación: | 2012 | Editor: | American Physical Society | Citación: | Physical Review B - Condensed Matter and Materials Physics 86 (2012) | Resumen: | Quantum crystals are characterized by zero-point-energy motions large enough to explore the details of the interaction potential beyond the harmonic approximation even at zero temperature. By making recourse to ultrahigh-resolution neutron spectroscopy, we have probed simultaneously three observables sensitive to anharmonic effects in solid para-H 2 over a wide temperature range, namely, Bragg scattering, molecular root-mean-square displacements, and the spectral linewidth of the J=0→ 1 rotational transition which, on average, amounts to a half-width at half-maximum of 1.8±0.2 οeV. These three quantities show no measurable variation with temperature, thus signaling the existence of a fully expanded crystal across the entire solid phase. Our results provide unambiguous experimental evidence for the intrinsic quantum character of this fundamental molecular solid. © 2012 American Physical Society. | URI: | http://hdl.handle.net/10261/72906 | DOI: | 10.1103/PhysRevB.86.144524 | Identificadores: | doi: 10.1103/PhysRevB.86.144524 issn: 1098-0121 |
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