journal article·2021-10-20Open access

Beyond magnons in Nd2ScNbO7 : An Ising pyrochlore antiferromagnet with all-in–all-out order and random fields

A. Scheie, M. Sanders, Xin Gui, Yiming Qiu, T. R. Prisk, R. J. Cava, C. Broholm

Physical Review B· Volume 104· Issue 13

Abstract

Many magnetic materials have quantum disordered magnetic ground states, but it is not always clear what drives them. Here, the authors study the pyrochlore magnet Nd${}2$ScNbO${}7$ using neutron diffraction, heat capacity, and neutron-sampled nuclear hyperfine excitations. The static magnetic moments inferred from these three techniques are inconsistent, pointing to some fraction of spins remaining dynamic to the lowest temperatures -- an observation confirmed by the anomalous low-energy density of states in the specific heat. Similar behavior is seen in Nd${}2$Zr${}2$O${}7$. It could indicate either quantum spin-liquid behavior or local disorder-induced spin singlets.
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Research context

OpenAlex topics: Advanced Condensed Matter Physics · Physics of Superconductivity and Magnetism · Magnetic and transport properties of perovskites and related materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA

Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA

NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA

Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA

Funding

Office of Science · Oak Ridge National Laboratory · U.S. Department of Energy · Basic Energy Sciences · Gordon and Betty Moore Foundation · National Science Foundation

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