Nuclear magnetic relaxation in niobium metal

Measurements of spin-lattice and transverse relaxation rates of 93Nb nuclei in various samples of niobium have been measured by a pulsed radio-frequency method in a temperature range of 20-30 °K. The rates were sample dependent. Transverse relaxation in the best sample corresponded to a near-Lorentzian line of width 7 5 oersted. The dipolar line width was estimated to be 7.2 oersted. The best value for the product of spin-lattice relaxation time and temperature was found to be temperature independent and equal to 0.358 ± 0.01 sec degk. This value differs from the value of 0.190 sec degk measured by Asayama and Itoh in 1962 and the value of 0.132-0.147 sec degk predicted theoretically by Yafet and Jaccarino in 1964. The discrepancy between the new measured value and theory is discussed in the light of recent theoretical and experimental developments. It is not reduced by plausible modifications of the band structure. Enhancement of the electron specific heat by a factor of roughly 2-3 due to many-body effects could account for the discrepancy.

[1]  A. Clogston.  Strong Phonon Effects in High-Transition-Temperature Superconductors , 1964 .

[2]  H. A. Leupold,et al.  Superconducting and Normal Specific Heats of a Single Crystal of Niobium , 1964 .

[3]  P. H. Keesom,et al.  Specific Heat of Niobium between 0.4 and 4.2°K , 1964 .

[4]  L. Drain.  The temperature dependence of the nuclear magnetic resonance of vanadium , 1964 .

[5]  J. Butterworth.  Nuclear magnetic relaxation and the magnetic properties of V-Cr alloys , 1964 .

[6]  L. Kadanoff,et al.  TRANSPORT THEORY FOR ELECTRON-PHONON INTERACTIONS IN METALS , 1964 .

[7]  Y. Yafet,et al.  Nuclear Spin Relaxation in Transition Metals; Core Polarization , 1964 .

[8]  S. D. Silverstein.  Effects of Electron Correlations on the Properties of Alkali Metals , 1963 .

[9]  F. Ham.  Energy Bands of Alkali Metals. II. Fermi Surface , 1962 .

[10]  S. D. Silverstein.  INFLUENCE OF ELECTRON INTERACTIONS ON METALLIC PROPERTIES. I. SPECIFIC HEAT , 1962 .

[11]  K. Asayama,et al.  Nuclear Spin-Lattice Relaxation in Nb Metal , 1962 .

[12]  P. Beck,et al.  Low-Temperature Specific Heat of Body-Centered Cubic Ti-V Alloys , 1962 .

[13]  C. H. Smith,et al.  The electrical resistivity of vanadium and vanadium-chromium solid solutions , 1962 .

[14]  Douglas L. Martin.  Specific Heat of Sodium at Low Temperatures , 1961 .

[15]  J. Butterworth.  Nuclear Spin-Lattice Relaxation in Vanadium Metal , 1960 .

[16]  G. L. Miller,et al.  Tantalum and Niobium , 1960 .

[17]  A. G. Anderson,et al.  NUCLEAR SPIN-LATTICE RELAXATION IN METALS , 1959 .

[18]  C. Slichter,et al.  Nuclear Relaxation in Aluminum , 1959 .

[19]  K. Murakawa.  Quadrupole Moment of Nb93 and Test of the Hyperfine Structure Formulas , 1958 .

[20]  M. Buckingham,et al.  The Specific Heat of Metals at Low Temperatures , 1954 .

[21]  J. Korringa.  Nuclear magnetic relaxation and resonnance line shift in metals , 1950 .