PHY 445/515 Senior Lab

PHY 445 / PHY 515 Homeworks

Due Feb. 16/17

This is only a part of the HW assignment.

Find, within the accuracy specified, the measured values for the items below. Use any source available to you, including

consulting with faculty,
looking up in textbooks (Kittel's, Ashcrof-Mermin, etc.) or in
reference material (the CRC Handbooks, the Landolt-Bornstein series etc.) or in
manufacturers' specification sheets (Omega catalog, Lake Shore catalog) and in
databases on the internet.

Specify a refence (must be printed; no internet or verbal communication is acceptable) for all data. Required relative accuracy is given in %=10^-2 or in ppm=10^-6.

-The superconducting transition temperature of Al metal (1% accuracy) and
-YBa₂Cu₃O₇ (5%)
-The lattice spacing of diamond at room temperature (100ppm)
-The resistivity ratio of high purity platinum metal between the temperatures of 100^oC and 0^oC. (2%)

Calculate the quantities specified below. You may use accepted values for the necessary parameters without specifying references.

-What is the magnetic field H (in Tesla) of a dipole moment of magnitude 1 Bohr magneton (exactly) at a distance of d=1.00nm in the direction of the dipole axis.
-What is the Hall voltage, U_H = R_H I B / d , for a sample of doped germanium, where d = 0.1mm, B = 0.35T and I = 10^-6A. The Hall coefficient R_H is inversely proportional to the carrier density n = 9 x 10¹³cm^-3 and to the electron charge.
-What is the frequency (in Hz) of electron spin resonance in magnetic field of 5 Gauss.