Back to Search
Start Over
23Na NMR study of non-superconducting double-layer hydrate NaxCoO2.yH2O
- Publication Year :
- 2006
- Publisher :
- arXiv, 2006.
-
Abstract
- We report 23Na NMR studies of the polycrystalline samples of double-layer hydrated cobalt oxides NaxCoO2.yH2O (x ~ 0.35 and y ~ 1.3) with the superconducting transition temperatures Tc < 1.8K and ~4.5K, and the dehydrated NaxCoO2 (x ~ 0.35). The hyperfine field and the electric field gradient at the Na sites in the non-hydrated Na0.7CoO2 and the dehydrated Na0.35CoO2 are found to be significantly reduced by the hydration, which indicates a strong shielding effect of the intercalated water molecules on the Na sites. The temperature dependence of 23 Na nuclear spin-lattice relaxation rate 1/23T1 of the non-superconducting double-layer hydrate NaxCoO2.yH2O is found to be similar to that of the non-hydrated Na0.7CoO2, whose spin dynamics is understood by A-type (intra-layer ferromagnetic and inter-layer antiferromagnetic) spin fluctuations. The superconducting phase is located close to the quantum critical point with the A-type magnetic instability.<br />4 pages, 4 figures
- Subjects :
- Superconductivity
Materials science
Condensed matter physics
Strongly Correlated Electrons (cond-mat.str-el)
Condensed Matter - Superconductivity
Spin–lattice relaxation
Energy Engineering and Power Technology
chemistry.chemical_element
FOS: Physical sciences
Condensed Matter Physics
Electronic, Optical and Magnetic Materials
Superconductivity (cond-mat.supr-con)
Condensed Matter - Strongly Correlated Electrons
Crystallography
chemistry
Ferromagnetism
Quantum critical point
Antiferromagnetism
Condensed Matter::Strongly Correlated Electrons
Electrical and Electronic Engineering
Physics::Chemical Physics
Hydrate
Cobalt
Electric field gradient
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....00e364bf5a6dd357b2d082a757710286
- Full Text :
- https://doi.org/10.48550/arxiv.cond-mat/0605487