Magnetic Properties of Synthetic Libethenite Cu2PO4OH: a New Spin-Gap System
- 12 September 2007
- journal article
- research article
- Published by American Chemical Society (ACS) in Inorganic Chemistry
- Vol. 46 (21), 8684-8689
- https://doi.org/10.1021/ic7008418
Abstract
Synthetic mineral libethenite Cu2PO4OH was prepared by the hydrothermal method, and its structure at 200 K was refined by single-crystal X-ray diffraction. The structure of Cu2PO4OH is built up from Cu22O6(OH)2 dimers of edge-sharing Cu2O4(OH) trigonal bipyramids and [Cu12O6(OH)2]∝ chains of edge-sharing Cu1O4(OH)2 octahedra. Magnetic properties of Cu2PO4OH were investigated by magnetic susceptibility, magnetization, and specific heat measurements. Cu2PO4OH is a spin-gap system with a spin gap of about 139 K. It was shown by spin dimer analysis that, to a first approximation, the magnetic structure of Cu2PO4OH is described by an isolated square-spin cluster model defined by the Cu1−O−Cu2 superexchange J with Cu1···Cu2 = 3.429 Å. The fitting analysis of the magnetic susceptibility data with a square-spin cluster model results in J/kB = 138 K. Specific heat data show that Cu2PO4OH does not undergo a long-range magnetic ordering down to 1.8 K. We also report vibrational properties studied with Raman spectroscopy and the thermal stability of Cu2PO4OH.This publication has 41 references indexed in Scilit:
- Comparison of the Crystal Structures and Magnetic Properties of the Low- and High-Temperature Forms of AgCuPO4: Crystal Structure Determination, Magnetic Susceptibility Measurements, and Spin Dimer AnalysisInorganic Chemistry, 2006
- Fabrication of Copper Hydroxyphosphate with Complex ArchitecturesThe Journal of Physical Chemistry B, 2006
- EPR, optical absorption, MIR and Raman spectral studies on libethenite mineralCrystal Research and Technology, 2006
- A new mineral, zincolibethenite, CuZnPO4OH, a stoichiometric species of specific site occupancyMineralogical Magazine, 2005
- Spin gap in low-dimensional magnets (Review)Low Temperature Physics, 2005
- Effect of Ni2+(S = 1) and Cu2+(S = ½) substitution on the antiferromagnetic ordered phase Co2(OH)PO4with spin glass behaviourJournal of Materials Chemistry, 2004
- Spin-glass behavior in a three-dimensional antiferromagnet ordered phase: Magnetic structure ofPhysical Review B, 2002
- Spin-singlet ground state with energy gaps in: Neutron-scattering, magnetic-susceptibility, and ESR measurementsPhysical Review B, 1997
- First Example of a CuII Polymeric Complex Having a Tetranuclear Repeating Unit with a S = 2 Ground State. Crystal Structure of [Cu4(dpk·CH3O)2Cl6]n (dpk·CH3OH = Unimethylated Diol of Di-2-pyridyl Ketone)Inorganic Chemistry, 1996
- Normal mode determination in crystalsJournal of Raman Spectroscopy, 1981