## An NMR study of the metal-insulator transition in tantalum-doped sodium tungsten bronze |

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Page i

Metallic samples near the transition and those on the

dramatically non- exponential spin-lattice relaxation curves corresponding to a

distribution of relaxation times ranging from seconds to a day or more. This

observation ...

Metallic samples near the transition and those on the

**insulating side**exhibitdramatically non- exponential spin-lattice relaxation curves corresponding to a

distribution of relaxation times ranging from seconds to a day or more. This

observation ...

Page 12

This sort of insulating state never occurs in crystalline materials with periodic

potentials. ... Mott's a . is discussed further in section 2.3. min On the

2.2.

This sort of insulating state never occurs in crystalline materials with periodic

potentials. ... Mott's a . is discussed further in section 2.3. min On the

**insulating****side**of the Anderson transition, where (E_-E ) < 0, a r c In_rLjij^iJ]jLJiru-[j^ Figure2.2.

Page 111

13 for each of the more insulating samples. The larger ... transition from the

metallic side and move through it to the

shift drop to zero and the distribution of shifts collapse around that zero. The

Clark ...

13 for each of the more insulating samples. The larger ... transition from the

metallic side and move through it to the

**insulating side**, we see the mean Knightshift drop to zero and the distribution of shifts collapse around that zero. The

Clark ...

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### Contents

Previous Work on the Tungsten Bronzes | 29 |

Sample Preparation and Analysis | 46 |

Experimental Techniques and Apparatus | 72 |

6 other sections not shown

### Common terms and phrases

absorption line absorption lineshape Anderson localization baking Bohr radius boxcar bronze samples chapter Clark classical percolation composition conduction band conduction electron concentration contact interaction core polarization correlation coulomb cubic phase curves for samples density diffusion runs dipole field dirty metal disorder donor doped semiconductor Doumerc energy EPMA eq'n experimental Fermi energy Fermi level Fermi surface Figure gauss gyromagnetic ratio homogeneous Hubbard model inhomogeneously insulating samples insulating side Knight shift Korringa relation Larmor frequency lattice constant Lett Lightsey linewidth M-I transition Magnetization recovery curves measured melt metallic samples micron Mott msec Narath nearest neighbor NMR properties non-exponential nuclear magnetization nuclei orbitals p(Ep particles Phys predicts pulse quartz ratio rigid band model scaling theory scattering signal sodium content spectrometer spin diffusion spin echo spin-lattice relaxation spin-lattice relaxation rate Ta-doped samples tantalum tantalum-doped temperature dependence Thesis unpublished tungsten tungsten bronze Tunstall wavefunction x y 1-y x-ray