Ferromagnetic Long Range Ordering in Copper(2) Maleate Monohydrate.
Abstract
The magnetic properties of copper (II) maleate monohydrate, Cu(C4H2O4) H2O, have been measured in the 1.8-66 K range. Magnetic susceptibility and isothermal magnetization measurements on powdered samples reveal a transition to a ferromagnetic state in this layered compound. The transition to the ordered state occurs at Tc = 4.0 K. The positive value of 8.0 K for the Weiss constant in the paramagnetic region confirms the ferromagnetic nature of the interactions. The magnetic susceptibility data above 3Tc may be fit with a Heisenberg quadratic layer expression with the best fit parameters J = +4.3/cm, g = 2.0, and zJ' = +0.42/cm. The e.p.r. spectrum at room temperature indicates orthorhombic symmetry. A complex containing the isomeric form of the ligand, copper (II) fumarate dihydrate, has also been prepared and its magnetic properties determined in the 80-300 K range. Keywords: Heisenberg quadratic layer; Ferromagnetism superexchange; Low dimensional compounds; Long range ordering; Carboxylate bridges; Copper compounds; Maleates. (mjm)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 20, 1988
- Accession Number
- ADA201596
Entities
People
- John R. Wasson
- Juan Padilla
- William E. Estes
- William E. Hatfield
Organizations
- University of North Carolina at Chapel Hill