An analysis of the fruit and vegetable wholesale markets at Minneapolis and St. Paul, Minnesota

Thesis (M.B.A)--Boston Universit

The redevelopment of Bird Mill, East Walpole, Massachusetts : public/private profit from rehabilitation and reuse

Thesis (M.C.P. and M.S.)--Massachusetts Institute of Technology, Dept. of Urban Studies and Planning, 1986.MICROFICHE COPY AVAILABLE IN ARCHIVES AND ROTCHBibliography: p. 129-130.by Pamela Carol Chicklis.M.S.M.C.P

Critical behavior of the magnetic susceptibility of the uniaxial ferromagnet LiHo F

The magnetic susceptibility of two LiHoF4 single crystals has been measured in the range 1.2-4.2 K. Ferromagnetic order occurs at Tc=1.527 K. Above 2.5 K, the susceptibilities parallel and perpendicular to the fourfold c axis are well interpreted by the molecular-field approximation, taking into account the ground state and the first excited state of Ho3+ in the crystal field of S4 symmetry. The experimental results are consistent with g∥=13.95 and g⊥=0 for the ground state. The dipolar contribution to the magnetic interaction is about three times larger than the exchange one. Near Tc, the parallel susceptibility is well described by the classical law with logarithmic corrections theoretically predicted by Larkin and Khmel'mitskii for the uniaxial dipolar ferromagnet or by a power law with a critical-exponent value γ=1.05 rather close to 1. The upper limit of the critical region is (Tmax-Tc) / Tc=1.1×10-2