Magnetic field effects in an octupolar quantum spin liquid candidate

Gao, Bin; Chen, Tong; Yan, Han; Duan, Chunruo; Huang, Chien-Lung; Yao, Xu Ping; Ye, Feng; Balz, Christian; Stewart, J. Ross; Nakajima, Kenji; Ohira-Kawamura, Seiko; Xu, Guangyong; Xu, Xianghan; Cheong, Sang-Wook; Morosan, Emilia; Nevidomskyy, Andriy H.; Chen, Gang; Dai, Pengcheng

doi:10.1103/physrevb.106.094425

Title: Magnetic field effects in an octupolar quantum spin liquid candidate

Journal Article · Thu Sep 22 00:00:00 EDT 2022 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.106.094425· OSTI ID:1890280

^[1]; Chen, Tong ^[1];

^[1]; Duan, Chunruo ^[1];

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^[2];

^[3];

^[4]; Stewart, J. Ross ^[4];

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^[5]; Xu, Guangyong ^[6]; Xu, Xianghan ^[7]; Cheong, Sang-Wook ^[7]; Morosan, Emilia ^[1]; Nevidomskyy, Andriy H. ^[1];

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Rice Univ., Houston, TX (United States)
Univ. of Hong Kong, Pokfulam (Hong Kong)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
Science and Technology Facilities Council (STFC) (United Kingdom). Rutherford Appleton Lab. (RAL)
Japan Proton Accelerator Research Complex (J-PARC) (Japan)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Rutgers Univ., Piscataway, NJ (United States)

Quantum spin liquid (QSL) is a disordered state of quantum-mechanically entangled spins commonly arising from frustrated magnetic dipolar interactions. However, QSL in some pyrochlore magnets can also come from frustrated magnetic octupolar interactions. Although the key signature for both dipolar and octupolar interaction-driven QSL is the presence of a spin excitation continuum (spinons) arising from the spin quantum number fractionalization, an external magnetic field-induced ferromagnetic order will transform the spinons into conventional spin waves in a dipolar QSL. By contrast, in an octupole QSL, the spin waves carry octupole moments that do not couple, in the leading order, to an external magnetic field or to neutron moments but will contribute to the field dependence of the heat capacity. Here, in this study, we use neutron scattering to show that the application of a large external magnetic field to Ce₂Zr₂O₇, an octupolar QSL candidate, induces an Anderson-Higgs transition by condensing the spinons into a static ferromagnetic ordered state with octupolar spin waves invisible to neutrons but contributing to the heat capacity. Our theoretical calculations also provide a microscopic, qualitative understanding for the presence of octupole scattering at large wave vectors in Ce₂Sn₂O₇ pyrochlore, and its absence in Ce₂Zr₂O₇. Therefore, our results identify Ce₂Zr₂O₇ as a strong candidate for an octupolar U(1) QSL, establishing that frustrated magnetic octupolar interactions are responsible for QSL properties in Ce-based pyrochlore magnets.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Rice Univ., Houston, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Robert A. Welch Foundation; Research Grants Council (RGC); Gordon and Betty Moore Foundation

Grant/Contract Number:: AC05-00OR22725; SC0012311; SC0019503; FG02-07ER46382; DMR-1917511; C-1839; C-2114; 17306520; GBMF10104

OSTI ID:: 1890280

Alternate ID(s):: OSTI ID: 2281379; OSTI ID: 2281564

Journal Information:: Physical Review. B, Vol. 106, Issue 9; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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