6,095 research outputs found
On the Consistency of MSGUT Spectra
We show explicitly that, once convention dependent phases are properly
accounted for, the mass spectra evaluated by us in hep-ph\0204097 and
hep-ph\0405074 satisfy the Trace, SU(5) reassembly and Goldstone counting
consistency checks. Furthermore proper phase accounting shows that the
transposition symmetry called "Hermiticity" will be manifest only up to signs
arising from the product of six phase factors which must be reinserted if the
symmetry is to be verified also as regards signs. Thus the claims of
hep-ph/0405300 and hep-ph/0412348 concerning the inconsistency of our results
are completely mistaken. The Chiral multiplet spectra of the two calculations
are equivalent. However our method also gives all gauge and gauge chiral
spectra as well as a MSSM decomposition of all SO(10) MSGUT couplings, for both
tensors and spinors, which are unavailable, even in principle, using the
methods of the above papers.Comment: 9, pages 2 column, revtex
Study on successive superconducting transitions in TaSC from electrical resistivity and nonlinear AC magnetic susceptibility
TaSC compound undergoes superconducting transitions at K and K. The nature of successive
superconducting transitions has been studied from electrical resistivity,
linear and nonlinear AC magnetic susceptibilities. The resistivity at
= 0 shows a local maximum near , a kink-like behavior around
, and reduces to zero at below = 2.1 K. The dependence
of is observed at = 50 kOe at low temperatures, which is due to
two-dimensional weak-localization effect. Below a two-dimensional
superconducting phase occurs in each TaC layer. The linear and nonlinear
susceptibilities , ,
, and as well as the difference
() between the FC and ZFC
susceptibilities, start to appear below 6.0 K, the onset temperature of
irreversibility. A drastic growth of the in-plane superconducting coherence
length below 6.0 K gives rise to a three-dimensional superconducting phase
below , through interplanar Josephson couplings between adjacent TaC
layers. The oscillatory behavior of ,
, and below is
related to the nonlinear behavior arising from the thermally activated flux
flow.Comment: 11 pages, 10 figures, Physical Review B (accepted for publication
Determination of the mosaic angle distribution of Grafoil platelets using continuous-wave NMR spectra
We described details of a method to estimate with good accuracy the mosaic
angle distributions of microcrystallites (platelets) in exfoliated graphite
like Grafoil which is commonly used as an adsorption substrate for helium thin
films. The method is based on analysis of resonance field shifts in
continuous-wave (CW) NMR spectra of He ferromagnetic monolayers making
use of the large nuclear polarization of the adsorbate itself. The mosaic angle
distribution of a Grafoil substrate analyzed in this way can be well fitted to
a gaussian form with a deg spread. This distribution is quite
different from the previous estimation based on neutron scattering data which
showed an unrealistically large isotropic powder-like component.Comment: 6 pages, 5 figure
The boiling suppression of liquid nitrogen
When He gas is injected from room temperature into boiling liquid N,
boiling is suppressed, leaving liquid surface flat like a mirror. Although the
qualitative explanation for this phenomenon is known [Minkoff G J \textit{et
al}. Nature 1957;180(4599):1413-4.], it has not been studied quantitatively and
comprehensively yet. In this report, we made careful simultaneous measurements
of temperature and weight variation of the liquid. The results clearly indicate
that the boiling suppression is caused by cooling of the liquid with "internal
evaporation" of N into the He bubbles.Comment: 14 pages, 7 figure
On the Mott glass in the one-dimensional half-filled charge density waves
We study the effect of impurity pinning on a one-dimensional half-filled
electron system, which is expressed in terms of a phase Hamiltonian with the
charge degree of freedom. Within the classical treatment, the pinned state is
examined numerically. The Mott glass, which has been pointed out by Orignac et
al. [Phys. Rev. Lett 83 (1999) 2378], appears in the intermediate region where
the impurity potential competes with the commensurate potential. Such a state
is verified by calculating the soliton formation energy, the local restoring
force around the pinned state and the optical conductivity.Comment: 13 pages, 5 figures, to be published in J. Phys. Soc. Jpn. 72 No.11
(2003
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