Multiphase competition in the quantum XY pyrochlore antiferromagnet ${\mathrm{CdYb}}_{2}{\mathrm{Se}}_{4}$: Zero and applied magnetic field study

Multiphase competition in the quantum XY pyrochlore antiferromagnet ${CdYb}_{2} {Se}_{4}$ : Zero and applied magnetic field study

K. Guratinder, Jeffrey G. Rau, V. Tsurkan, C. Ritter, J. Embs, T. Fennell, H. C. Walker, M. Medarde, T. Shang, A. Cervellino, Ch. Rüegg, and O. Zaharko

Phys. Rev. B 100, 094420 – Published 12 September 2019

Abstract

We study magnetic behavior of the ${Yb}^{3 +}$ ions on a frustrated pyrochlore lattice in the spinel ${CdYb}_{2} {Se}_{4}$ . 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 $Γ_{5}$ state to a splayed icelike ferromagnet (both with $k = 0$ ) in applied magnetic field with $B_{c} = 3 T$ . Low-energy inelastic neutron scattering identifies weakly dispersive magnetic bands around 0.72 meV starting at $| Q | = 1.1 Å^{- 1}$ 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 $S = \frac{1}{2}$ Kramers doublets on the pyrochlore lattice. The estimated exchanges position the ${CdYb}_{2} {Se}_{4}$ spinel close to the phase boundary between the $Γ_{5}$ and splayed ferromagnet states, similar to the Yb pyrochlores, suggesting an important role of the competition between these phases.

Received 13 May 2019
Revised 24 August 2019

DOI:https://doi.org/10.1103/PhysRevB.100.094420

Physics Subject Headings (PhySH)

Exchange interaction Frustrated magnetism Magnetic anisotropy Magnetism

Pyrochlores Spinels

Inelastic neutron scattering Neutron diffraction

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

K. Guratinder

Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, CH-5232 Villigen, Switzerland and Department of Quantum Matter Physics, University of Geneva, CH-1211 Geneva, Switzerland

Jeffrey G. Rau

Max-Planck-Institut für Physik komplexer Systeme, 01187 Dresden, Germany

V. Tsurkan

Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, D-86159 Augsburg, Germany and Institute of Applied Physics, Academy of Sciences of Moldova, MD-2028 Chisinau, Republic of Moldova

C. Ritter

Institut Laue-Langevin, 156X, 38042 Grenoble Cédex, France

J. Embs and T. Fennell

Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, CH-5232 Villigen, Switzerland

H. C. Walker

Rutherford Appleton Laboratory, ISIS Facility, Chilton, Didcot, Oxon OX11 0QX, United Kingdom

M. Medarde and T. Shang

Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute, CH-5232 Villigen, Switzerland

A. Cervellino

Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen, Switzerland

Ch. Rüegg

Research Division Neutrons and Muons, Paul Scherrer Institute, CH-5232 Villigen, Switzerland and Department of Quantum Matter Physics, University of Geneva, CH-1211 Geneva, Switzerland

O. Zaharko^*

Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, CH-5232 Villigen, Switzerland

^*oksana.zaharko@psi.ch

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Vol. 100, Iss. 9 — 1 September 2019

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Physical Review B

covering condensed matter and materials physics

Multiphase competition in the quantum XY pyrochlore antiferromagnet ${CdYb}_{2} {Se}_{4}$ : Zero and applied magnetic field study

K. Guratinder, Jeffrey G. Rau, V. Tsurkan, C. Ritter, J. Embs, T. Fennell, H. C. Walker, M. Medarde, T. Shang, A. Cervellino, Ch. Rüegg, and O. Zaharko

Phys. Rev. B 100, 094420 – Published 12 September 2019

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Physical Review B

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

K. Guratinder, Jeffrey G. Rau, V. Tsurkan, C. Ritter, J. Embs, T. Fennell, H. C. Walker, M. Medarde, T. Shang, A. Cervellino, Ch. Rüegg, and O. Zaharko

Phys. Rev. B 100, 094420 – Published 12 September 2019

Abstract

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Authors & Affiliations

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Multiphase competition in the quantum XY pyrochlore antiferromagnet ${CdYb}_{2} {Se}_{4}$ : Zero and applied magnetic field study