Multiphase competition in the quantum XY pyrochlore antiferromagnet CdYb2Se4: Zero and applied magnetic field study
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GURATINDER, K.; RAU, Jeffrey G.; TSURKAN, Vladimir; RITTER, Clemens; EMBS, Jan Peter; FENNELL, Tom; WALKER, Helen C.; MEDARDE, Marisa Luisa; SHANG, Tian; CERVELLINO, Antonio; RUEGG, Ch; ZAHARKO, Oksana. Multiphase competition in the quantum XY pyrochlore antiferromagnet CdYb2Se4: Zero and applied magnetic field study. In: Physical Review B. 2019, nr. 9(100), p. 0. ISSN -.
10.1103/PhysRevB.100.094420
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Physical Review B
Numărul 9(100) / 2019 / ISSN - /ISSNe 0163-1829

Multiphase competition in the quantum XY pyrochlore antiferromagnet CdYb2Se4: Zero and applied magnetic field study


DOI: 10.1103/PhysRevB.100.094420
Pag. 0-0

Guratinder K.1, Rau Jeffrey G.2, Tsurkan Vladimir34, Ritter Clemens5, Embs Jan Peter1, Fennell Tom1, Walker Helen C.6, Medarde Marisa Luisa1, Shang Tian1, Cervellino Antonio1, Ruegg Ch17, Zaharko Oksana1
 
1 Paul Scherrer Institute,
2 Institutul Max Planck pentru fizica sistemelor complexe, Dresden,
3 University of Augsburg,
4 Institute of Applied Physics,
5 Institut Laue-Langevin, Grenoble,
6 Rutherford Appleton Laboratory, Harwell Oxford,
7 Université de Genève
 
Disponibil în IBN: 8 octombrie 2019


Rezumat

We study magnetic behavior of the Yb3+ ions on a frustrated pyrochlore lattice in the spinel CdYb2Se4. The crystal-electric-field parameters deduced from high-energy inelastic neutron scattering reveal a well-isolated ytterbium ground-state doublet with a weakly Ising character. Magnetic order studied by powder neutron diffraction evolves from the XY-type antiferromagnetic Γ5 state to a splayed icelike ferromagnet (both with k=0) in applied magnetic field with Bc=3T. Low-energy inelastic neutron scattering identifies weakly dispersive magnetic bands around 0.72 meV starting at |Q|=1.1Å-1 at zero field, which diminish with field and vanish above 3 T. We explain the observed magnetic behavior in framework of the nearest-neighbor anisotropic exchange model for effective S=12 Kramers doublets on the pyrochlore lattice. The estimated exchanges position the CdYb2Se4 spinel close to the phase boundary between the Γ5 and splayed ferromagnet states, similar to the Yb pyrochlores, suggesting an important role of the competition between these phases.

Cuvinte-cheie
Cadmium compounds, Crystal lattices, Electric fields, Electromagnetic wave scattering, Ferromagnetic materials, ferromagnetism, Ground state, Inelastic neutron scattering, Magnetic fields, Magnets, Selenium compounds, Superconducting materials