Anomalous Spectrum of<sup>133</sup>Cs NMR in CsCuCl<sub>3</sub>around the Applied Field 11 T

Chiba, M.; Ohara, Kazuhiro; Ajiro, Yoshitami; Morimoto, Takahiro

doi:10.1143/jpsj.62.4186

Cited by 12 publications

(5 citation statements)

References 8 publications

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“…The derivatives D ′′ and D ′ are then calculated and substituted into Eq. (6). A deviation of L (z) = 0 within the error bars of the reconstruction sig-FIG.…”

Section: Introductionmentioning

confidence: 94%

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A litmus test for Lambda

Zunckel,

Clarkson

2008

Preprint

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The critical issue in cosmology today lies in determining if the cosmological constant is the underlying ingredient of dark energy. Our profound lack of understanding of the physics of dark energy places severe constrains on our ability to say anything about its possible dynamical nature. Quoted errors on the equation of state, w(z), are so heavily dependent on necessarily over-simplified parameterisations they are at risk of being rendered meaningless. Moreover, the existence of degeneracies between the reconstructed w(z) and the matter and curvature densities weakens any conclusions still further. We propose consistency tests for the cosmological constant which provide a direct observational signal if Λ is wrong, regardless of the densities of matter and curvature. As an example of its utility, our flat case test can warn of a small transition from w(z) = −1 of 20% from SNAP quality data at 4-σ, even when direct reconstruction techniques see virtually no evidence for deviation from Λ. It is shown to successfully rule out a wide range of non-Λ dark energy models with no reliance on knowledge of Ωm using SNAP-quaility data and a large range for using 10 5 supernovae as forecasted for LSST.

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“…The derivatives D ′′ and D ′ are then calculated and substituted into Eq. (6). A deviation of L (z) = 0 within the error bars of the reconstruction sig-FIG.…”

Section: Introductionmentioning

confidence: 94%

“…An alternative procedure is to reconstruct w(z) directly from the observables without any dependence on a parameterisation of w(z) or understanding of dark energy [4,5,6]. Such direct reconstruction methods rely on estimating the first and second derivatives of luminositydistance data.…”

Section: Introductionmentioning

confidence: 99%

A litmus test for Lambda

Zunckel,

Clarkson

2008

Preprint

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“…The competition between the small planar anisotropy and the quantum fluctuation gives rise to the phase transition at H c . The coplanar spin structure predicted for the high-field phase was confirmed by means of neutron scattering [16,17] and ESR measurements [18] in pulsed high magnetic fields, and NMR measurements [19].…”

Section: Introductionmentioning

confidence: 63%

A new ordered phase in the spin-½ triangular antiferromagnetic system CsCu_1-xCo_xCl₃

Ono

Horai

Tanaka

2000

J. Phys.: Condens. Matter

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The magnetization and magnetic torque of the triangular antiferromagnetic system CsCu1-x Cox Cl3 with x 0.032 have been measured in magnetic fields up to 7 T. CsCuCl3 is a spin-½ triangular antiferromagnet with planar anisotropy, and has a 120° spin structure in the c -plane below T N = 10.5 K. It is observed that the macroscopic anisotropy changes from the planar type to the axial one with increasing Co2+ concentration x . It is found that the small amount of Co2+ doping produces a new ordered phase in the low-temperature and low-field region, i.e., the present system can undergo two phase transitions at zero field. The transition field at which the new phase becomes unstable is minimum for H c and maximum for H c . With increasing Co2+ concentration x , the area of the new phase is enlarged in the phase diagram for temperature versus magnetic field. The new phase has a weak spontaneous magnetization in the c -direction.

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“…Cs is a quadrupolar nucleus (I ¼ 7/2, 100%) which can be considered as a less commonly studied nucleus in the frame of solid-state NMR. 54 The studies involving 133 Cs solid-state NMR were mainly related to the characterization of phase transitions in Cs containing compounds, 55,56 to minerals and zeolites, 29,[57][58][59] and fullerides. 60 Because its quadrupole moment is relatively small (Q ¼ À3 Â 10 À31 m 2 ), the influence of the quadrupolar interaction on solid-state NMR is generally analyzed using firstorder perturbation theory.…”

Section: Cs Mas Nmr Spectroscopy 133mentioning

confidence: 99%