X-ray study of pressure-collapsed fullerite

Kosowsky, S. D.; Hsu, Chia-Hao; Chen, Nancy H.; Moshary, Fred; Pershan, Peter S.; Silvera, Isaac F.

doi:10.1103/physrevb.48.8474

Cited by 22 publications

(6 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This analysis supports the existence of a regular magnetic field of 0.3 µG in the local supercluster. More recent discussions of possible observational consequences on cosmological magnetic fields that include the effects on the CMB anisotropy were made in [16]. Several mechanisms have been proposed to explain the origin of the seed field.…”

Section: Introductionmentioning

confidence: 99%

Gravitoelectromagnetic inflation from a 5D vacuum state: A new formalism

2006

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

Gravitoelectromagnetic inflation from a 5D vacuum state: A new formalism

2006

View full text Add to dashboard Cite

show abstract

“…3,4 However, high pressure studies show that in fcc C 60 crystals amorphization occurs due to a collapse of the C 60 molecules at ~22 GPa, possibly due to the intermolecular interaction under high pressure. [5][6][7] C 70 is the second most abundant fullerene and has many properties which are superior to those of C 60 , such as conductivity, photoconductivity and optical limiting performance. [8][9][10][11] Above room temperature, the freely rotating C 70 molecules form a close-packed lattice.…”

Section: Introductionmentioning

confidence: 99%

Pressure-Induced Phase Transitions of C₇₀ Nanotubes

et al. 2011

View full text Add to dashboard Cite

Single crystalline C 70 nanotubes having a face-centered-cubic (fcc) structure with diameters in the nanometer scale were synthesized by a facile solution method. In-situ high pressure Raman spectroscopy and X-ray diffraction have been employed to study the structural stability and phase transitions of the pristine sample. We show that the molecular orientation related phase transition from the fcc structure to a rhombohedral structure occurs at about 1.5 GPa, which is ~1 GPa higher than in bulk C 70 . Also, the C 70 molecules themselves are more stable in the nanotubes than in bulk crystals, manifested by a partial amorphization at ~20 GPa. The crystal structure of C 70 nanotubes could partially return to the initial structure after a pressure cycle above 30.8 GPa, and the C 70 molecules were intact up to 43 GPa. The bulk modulus of C 70 nanotubes is measured to be ~50 GPa, which is twice larger than that of bulk C 70.2

show abstract

“…The most interesting observational manifestations of both factors are the possible rotation of the CMB polarization, distortions of its Gaussianity and the power spectra of the temperature and polarization at small and large scales, and, in particular, intermixture of the "E" and "B" modes of the CMB polarization (see, e.g., Kosowsky & Loeb 1996;Harari et al 1997;Campanelli et al 2004;Kosowsky et al 2005;Subramanian 2006;Giovannini 2006). In fact, the expected Faraday rotation of the CMB is estimated to be It is well known that both the rotation and magnetic fields are strongly suppressed in the models of standard inflation (see, e.g., Widrow 2002).…”

Section: Observational Manifestationsmentioning

confidence: 99%

Extensions of the standard cosmological model: Anisotropy, rotation, and the magnetic field

Demiański

Doroshkevich

2007

Phys. Rev. D

View full text Add to dashboard Cite

We show that the difference between the theoretically expected and measured by WMAP amplitude of the quadrupole fluctuations of CMB can be related to the impact of the anisotropic curvature of the homogeneous universe dominated by the dark energy. In such universe the matter expansion becomes practically isotropic just after the period of inflation and only at small redshifts the anisotropic expansion is generated again by the small curvature ΩK = 1 − Ωm − ΩΛ ≤ 10 −4 . For such models the possible deviations from the parameters derived for the standard cosmological model are evidently negligible but the correlations of large scale perturbations and distortions of their Gaussianity are possible. Such models are also compatible with existence of a homogeneous magnetic field and matter rotation which contribute to the low ℓ anisotropy and can be considered as "hidden parameters" of the model. Their influence can be observed as, for example, special correlations of small scale fluctuations and the Faraday rotation of the CMB and radiation of the farthest quasars. However, both the magnetic field and matter rotation require also modifications of the simple models of isotropic inflation and they change the evolutionary history of the early Universe.PACS number(s): 98.80.Es.

show abstract

X-ray study of pressure-collapsed fullerite

Cited by 22 publications

References 6 publications

Gravitoelectromagnetic inflation from a 5D vacuum state: A new formalism

Gravitoelectromagnetic inflation from a 5D vacuum state: A new formalism

Pressure-Induced Phase Transitions of C₇₀ Nanotubes

Extensions of the standard cosmological model: Anisotropy, rotation, and the magnetic field

Contact Info

Product

Resources

About

X-ray study of pressure-collapsed fullerite

Cited by 22 publications

References 6 publications

Gravitoelectromagnetic inflation from a 5D vacuum state: A new formalism

Gravitoelectromagnetic inflation from a 5D vacuum state: A new formalism

Pressure-Induced Phase Transitions of C70 Nanotubes

Extensions of the standard cosmological model: Anisotropy, rotation, and the magnetic field

Contact Info

Product

Resources

About

Pressure-Induced Phase Transitions of C₇₀ Nanotubes