Neutron scattering is used to probe antiferromagnetic spin fluctuations in the d-wave heavy fermion superconductor CeCoIn5 (T_(c)=2.3 K). Superconductivity develops from a state with slow (variant ...Planck's over 2piGamma=0.3+/-0.15 meV) commensurate Q_(0)=(1/2,1/2,1/2) antiferromagnetic spin fluctuations and nearly isotropic spin correlations. The characteristic wave vector in CeCoIn5 is the same as CeIn3 but differs from the incommensurate wave vector measured in antiferromagnetically ordered CeRhIn5. A sharp spin resonance (variant Planck's over 2piGamma<0.07 meV) at variant Planck's over 2piomega=0.60+/-0.03 meV develops in the superconducting state removing spectral weight from low-energy transfers. The presence of a resonance peak is indicative of strong coupling between f-electron magnetism and superconductivity and consistent with a d-wave gap order parameter satisfying Delta(q+Q0)=-Delta(q).
Large single crystals of YbRh2Si2 have been successfully grown from a high-temperature solution technique, using Zn flux and followed by a decanting process. As opposed from the crystals growth from ...In flux, the crystals are flux-free and larger on average, suitable for neutron scattering experiments. Characterization of basic physical properties and comparison with crystals grown using In flux were performed.
Factors associated with psychological distress were examined in 220 low-income, mostly minority mothers with late-stage HIV/AIDS. Mothers lived with at least one HIV-negative child of age 2-12 years ...and participated in a study of the effectiveness of a custody planning intervention provided by The Family Center. The mothers exhibited extraordinarily high levels of psychological disturbance on the Psychiatric Symptom Index (PSI). Multiple regression showed that higher PSI Total scores were significantly related to the mother's reports of having non-HIV-related medical conditions, spending time in bed in the past 2 weeks, having more activity restrictions, and having a lot of difficulty caring for her child due to ill health. Higher scores also were associated with lower education, experiencing more negative life events, and greater receipt and lower adequacy of social support. Thus, higher distress was associated with inability to perform usual activities and mobilization of support. However, other HIV-related health factors, traditional background characteristics, and psychosocial measures (e.g., HIV stigma, parenting stress, family environment) failed to indicate who was most vulnerable. Researchers need to identify the mechanisms of risk and develop appropriate mental health interventions.
Magnetic and transport properties of and Hudis, J.; Hu, R.; Broholm, C.L. ...
Journal of magnetism and magnetic materials,
12/2006, Letnik:
307, Številka:
2
Journal Article
Large single crystals of YbRh
2Si
2 have been successfully grown from a high-temperature solution technique, using Zn flux and followed by a decanting process. As opposed from the crystals growth ...from In flux, the crystals are flux-free and larger on average, suitable for neutron scattering experiments. Characterization of basic physical properties and comparison with crystals grown using In flux were performed.
We report on magnetic and transport properties of single crystals of the light rare earth containing series of compounds
RCoIn
5
(
R
=
Pr
,
Nd
)
and heavy rare earth containing series
RCoGa
5
(
R
=
...Tb
–
Tm
). All the compounds crystallize in the tetragonal
HoCoGa
5
crystal structure and are very good metals with small defect scattering at low temperatures.
NdCoIn
5
and members of the
RCoGa
5
series with large de Gennes factors order antiferromagnetically.
We report on magnetic and transport properties of single crystals of the light rare earth containing series of compounds RCoIn(5) (R = Pr, Nd) and heavy rare earth containing series RCoGa(5) (R = ...Tb-Tm). All the compounds crystallize in the tetragonal HoCoGa(5) crystal structure and are very good metals with small defect scattering at low temperatures. NdCoIn(5)and members of the RCoGas series with large de Gennes factors order antiferromagnetically.
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