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Ferrimagnetic 120 ° magnetic structure in Cu 2 OSO 4

Journal Article · · Physical Review B
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [9];  [10];  [1];  [1]
  1. Ecole Polytechnique Federale Lausanne (Switzlerland). Lab. for Quantum Magnetism, Inst. of Physics
  2. Ecole Polytechnique Federale Lausanne (Switzlerland). Lab. for Quantum Magnetism, Inst. of Physics; Paul Scherrer Inst. (PSI), Villigen (Switzerland). Lab. for Neutron Scattering
  3. Inst. Laue-Langevin (ILL), Grenoble (France)
  4. Paul Scherrer Inst. (PSI), Villigen (Switzerland). Lab. for Neutron Scattering
  5. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab., ISIS Neutron Source
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  7. Inst. of Physical and Chemical Research (RIKEN), Wako (Japan). Center for Emergent Matter Science
  8. Ecole Polytechnique Federale Lausanne (Switzlerland). Lab. for Quantum Magnetism, Inst. of Physics, and Lab. of Physics of Complex Matter
  9. Ecole Polytechnique Federale Lausanne (Switzlerland). Crystal Growth Facility
  10. Paul Scherrer Inst. (PSI), Villigen (Switzerland). Swiss Light Source
We report magnetic properties of a 3d9 (Cu2+) magnetic insulator Cu2OSO4 measured on both powder and single crystal. The magnetic atoms of this compound form layers whose geometry can be described either as a system of chains coupled through dimers or as a kagome lattice where every third spin is replaced by a dimer. Specific heat and DC susceptibility show a magnetic transition at 20 K, which is also confirmed by neutron scattering. Magnetic entropy extracted from the specific heat data is consistent with an S=1/2 degree of freedom per Cu2+, and so is the effective moment extracted from DC susceptibility. The ground state has been identified by means of neutron diffraction on both powder and single crystal and corresponds to an ~120° spin structure in which ferromagnetic intradimer alignment results in a net ferrimagnetic moment. No evidence is found for a change in lattice symmetry down to 2 K. Finally, our results suggest that Cu2OSO4 represents a type of model lattice with frustrated interactions where interplay between magnetic order, thermal and quantum fluctuations can be explored.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1684670
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 9 Vol. 102; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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