Competing gauge fields and entropically driven spin liquid to spin liquid transition in non-Kramers pyrochlores

Edited by J. C. Davis, University of Oxford, Oxford, United Kingdom; received February 20, 2024; accepted June 10, 2024
August 28, 2024
121 (36) e2403487121

Significance

Competing interactions in magnetic systems frustrate the development of long-range order, possibly down to absolute zero temperature, giving rise to a spin liquid. Gauge fields, akin to those used to describe the fundamental forces in the universe, are the mathematical objects of choice to describe spin liquids. In a model relevant to real magnetic pyrochlore materials, we uncover a spin liquid described by combined vector-like and matrix-like gauge fields. Classically, similarly to the liquid-to-liquid transition observed in some molecular liquids, this state disappears at low temperatures and gives way to a spin liquid with extensive entropy and with only the vector-like field thermally fluctuating. Quantum mechanically, the ground state is a spin liquid described by both gauge fields.

Abstract

Gauge theories are powerful theoretical physics tools that allow complex phenomena to be reduced to simple principles and are used in both high-energy and condensed matter physics. In the latter context, gauge theories are becoming increasingly popular for capturing the intricate spin correlations in spin liquids, exotic states of matter in which the dynamics of quantum spins never ceases, even at absolute zero temperature. We consider a spin system on a three-dimensional pyrochlore lattice where emergent gauge fields not only describe the spin liquid behavior at zero temperature but crucially determine the system’s temperature evolution, with distinct gauge fields giving rise to different spin liquid phases in separate temperature regimes. Focusing first on classical spins, in an intermediate temperature regime, the system shows an unusual coexistence of emergent vector and tensor gauge fields where the former is known from classical spin ice systems while the latter has been associated with fractonic quasiparticles, a peculiar type of excitation with restricted mobility. Upon cooling, the system transitions into a low-temperature phase where an entropic selection mechanism depopulates the degrees of freedom associated with the tensor gauge field, rendering the system spin-ice-like. We further provide numerical evidence that in the corresponding quantum model, a spin liquid with coexisting vector and tensor gauge fields has a finite window of stability in the parameter space of spin interactions down to zero temperature. Finally, we discuss the relevance of our findings for non-Kramers magnetic pyrochlore materials.

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Data, Materials, and Software Availability

Data in addition to those presented in the main text and in the SI Appendix, along with computer codes developed for the present study, are available in the following database: https://github.com/daniel-lozano/R1R2_spin_liquid_data (70).

Acknowledgments

We acknowledge useful discussions with Kai Chung, Alex Hickey, and Peter Holdsworth. The work at the University of Waterloo was supported by the Natural Sciences and Engineering Research Council of Canada and the Canada Research Chair (Tier 1, M.J.P.G.) program. Numerical simulations done at Waterloo were performed thanks to the computational resources of the Digital Research Alliance of Canada. D.L.-G. acknowledges the computing time provided by the Digital Research Alliance of Canada and the financial support from the Deutsche Forschungsgemeinschaft through the Hallwachs-Röntgen Postdoc Program of the Würzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter—ct.qmat (EXC 2147, project-id 390858490) and through Sonderforschungsbereich 1143 (project-id 247310070). J.R. and V.N. gratefully acknowledge the computing time provided to them on the high-performance computer Noctua 2 at the Verbund für Nationales Hochleistungsrechnen Center PC2. This is funded by the Federal Ministry of Education and Research and the state governments participating on the basis of the resolutions of the Gemeinsame Wissenschaftskonferenz for the national high-performance computing at universities (https://www.nhr-verein.de/unsere-partner). Some of the computations for this research were performed using computing resources under project hpc-prf-pm2frg. V.N. would like to thank the High Performance Computing Service of Zentraleinrichtung für Datenverarbeitung and Tron cluster service at the Department of Physics, Freie Universität Berlin, for computing time. The work of Y.I. and M.J.P.G. was performed, in part, at the Aspen Center for Physics, which is supported by NSF grant PHY-2210452. The work of R.R.P.S. was supported by the NSF grant DMR-1855111. J.O. acknowledges computing support provided by the Australian National Computation Infrastructure program. J.R. thanks Indian Institute of Technology (IIT) Madras for a Visiting Faculty Fellow position under the Institute of Eminence program. The participation of Y.I. at the Aspen Center for Physics was supported by the Simons Foundation. This research was supported in part by the NSF under Grant No. NSF PHY-1748958. Y.I. acknowledges support by the International Centre for Theoretical Physics through the Associates Programme and from the Simons Foundation through grant number 284558FY19, IIT Madras through the QuCenDiEM Centre of Excellence (Project No. SP22231244CPETWOQCDHOC), the International Centre for Theoretical Sciences (ICTS), Bengaluru, India during a visit for participating in the program “Frustrated Metals and Insulators” (Code: ICTS/frumi2022/9). Y.I. acknowledges the use of the computing resources at High Performance Computing Environment, IIT Madras.

Author contributions

Y.I., J.R., and M.J.P.G. designed research; D.L.-G., V.N., J.O., and R.R.P.S. performed research; D.L.-G., V.N., J.O., R.R.P.S., J.R., and M.J.P.G. analyzed data; and D.L.-G., V.N., R.R.P.S., Y.I., J.R., and M.J.P.G. wrote the paper.

Competing interests

The authors declare no competing interest.

Supporting Information

Appendix 01 (PDF)

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Information & Authors

Information

Published in

The cover image for PNAS Vol.121; No.36
Proceedings of the National Academy of Sciences
Vol. 121 | No. 36
September 3, 2024
PubMed: 39196626

Classifications

Data, Materials, and Software Availability

Data in addition to those presented in the main text and in the SI Appendix, along with computer codes developed for the present study, are available in the following database: https://github.com/daniel-lozano/R1R2_spin_liquid_data (70).

Submission history

Received: February 20, 2024
Accepted: June 10, 2024
Published online: August 28, 2024
Published in issue: September 3, 2024

Keywords

  1. spin liquids
  2. entropic selection
  3. liquid-to-liquid crossover
  4. competing gauge fields
  5. frustrated magnetism

Acknowledgments

We acknowledge useful discussions with Kai Chung, Alex Hickey, and Peter Holdsworth. The work at the University of Waterloo was supported by the Natural Sciences and Engineering Research Council of Canada and the Canada Research Chair (Tier 1, M.J.P.G.) program. Numerical simulations done at Waterloo were performed thanks to the computational resources of the Digital Research Alliance of Canada. D.L.-G. acknowledges the computing time provided by the Digital Research Alliance of Canada and the financial support from the Deutsche Forschungsgemeinschaft through the Hallwachs-Röntgen Postdoc Program of the Würzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter—ct.qmat (EXC 2147, project-id 390858490) and through Sonderforschungsbereich 1143 (project-id 247310070). J.R. and V.N. gratefully acknowledge the computing time provided to them on the high-performance computer Noctua 2 at the Verbund für Nationales Hochleistungsrechnen Center PC2. This is funded by the Federal Ministry of Education and Research and the state governments participating on the basis of the resolutions of the Gemeinsame Wissenschaftskonferenz for the national high-performance computing at universities (https://www.nhr-verein.de/unsere-partner). Some of the computations for this research were performed using computing resources under project hpc-prf-pm2frg. V.N. would like to thank the High Performance Computing Service of Zentraleinrichtung für Datenverarbeitung and Tron cluster service at the Department of Physics, Freie Universität Berlin, for computing time. The work of Y.I. and M.J.P.G. was performed, in part, at the Aspen Center for Physics, which is supported by NSF grant PHY-2210452. The work of R.R.P.S. was supported by the NSF grant DMR-1855111. J.O. acknowledges computing support provided by the Australian National Computation Infrastructure program. J.R. thanks Indian Institute of Technology (IIT) Madras for a Visiting Faculty Fellow position under the Institute of Eminence program. The participation of Y.I. at the Aspen Center for Physics was supported by the Simons Foundation. This research was supported in part by the NSF under Grant No. NSF PHY-1748958. Y.I. acknowledges support by the International Centre for Theoretical Physics through the Associates Programme and from the Simons Foundation through grant number 284558FY19, IIT Madras through the QuCenDiEM Centre of Excellence (Project No. SP22231244CPETWOQCDHOC), the International Centre for Theoretical Sciences (ICTS), Bengaluru, India during a visit for participating in the program “Frustrated Metals and Insulators” (Code: ICTS/frumi2022/9). Y.I. acknowledges the use of the computing resources at High Performance Computing Environment, IIT Madras.
Author contributions
Y.I., J.R., and M.J.P.G. designed research; D.L.-G., V.N., J.O., and R.R.P.S. performed research; D.L.-G., V.N., J.O., R.R.P.S., J.R., and M.J.P.G. analyzed data; and D.L.-G., V.N., R.R.P.S., Y.I., J.R., and M.J.P.G. wrote the paper.
Competing interests
The authors declare no competing interest.

Notes

This article is a PNAS Direct Submission.

Authors

Affiliations

Daniel Lozano-Gómez1 [email protected]
Department of Physics and Astronomy, University of Waterloo, Waterloo, ON N2L 3G1, Canada
Institut für Theoretische Physik and Würzburg-Dresden Cluster of Excellence ct.qmat, Technische Universität Dresden, Dresden 01062, Germany
Vincent Noculak
Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, Berlin 14195, Germany
Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin 14109, Germany
Jaan Oitmaa
School of Physics, The University of New South Wales, Sydney 2052, Australia
Rajiv R. P. Singh
Department of Physics, University of California, Davis, CA 95616
Department of Physics and Quantum Centre of Excellence for Diamond and Emergent Materials, Indian Institute of Technology Madras, Chennai 600036, India
Johannes Reuther
Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, Berlin 14195, Germany
Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin 14109, Germany
Department of Physics and Quantum Centre of Excellence for Diamond and Emergent Materials, Indian Institute of Technology Madras, Chennai 600036, India
Department of Physics and Astronomy, University of Waterloo, Waterloo, ON N2L 3G1, Canada

Notes

1
To whom correspondence may be addressed. Email: [email protected].

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    Competing gauge fields and entropically driven spin liquid to spin liquid transition in non-Kramers pyrochlores
    Proceedings of the National Academy of Sciences
    • Vol. 121
    • No. 36

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