Strongly-coupled quantum critical point in an all-in-all-out antiferromagnet
- California Inst. of Technology (CalTech), Pasadena, CA (United States). Division of Physics, Mathematics, and Astronomy
- Univ. of Chicago, IL (United States). Department of Physics, The James Franck Institute
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Univ. of Tennessee, Knoxville, TN (United States). Department of Materials Science and Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
- California Inst. of Technology (CalTech), Pasadena, CA (United States). Division of Physics, Mathematics, and Astronomy; Okinawa Institute of Science and Technology Graduate University, Onna (Japan)
Dimensionality and symmetry play deterministic roles in the laws of Nature. They are important tools to characterize and understand quantum phase transitions, especially in the limit of strong correlations between spin, orbit, charge, and structural degrees of freedom. Here, using newly-developed, high-pressure resonant X-ray magnetic and charge diffraction techniques, we have discovered a quantum critical point in Cd2Os2O7 as the all-in-all-out antiferromagnetic order is continuously suppressed to zero temperature and, concomitantly, the cubic lattice structure continuously changes from space group Fd-3m to F-43m. Surrounded by three phases of different time reversal and spatial inversion symmetries, the quantum critical region anchors two phase lines of opposite curvature, with striking departures from a mean-field form at high pressure. As spin fluctuations, lattice breathing modes, and quasiparticle excitations interact in the quantum critical region, we argue that they present the necessary components for strongly-coupled quantum criticality in this three-dimensional compound.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Science Foundation (NSF)
- Grant/Contract Number:
- AC02-06CH11357; FG02-94ER14466; AC05-00OR22725; DMR-1420709; EAR−1606856; EAR-1634415; DMR-1606858
- OSTI ID:
- 1465744
- Alternate ID(s):
- OSTI ID: 1474447
- Journal Information:
- Nature Communications, Vol. 9, Issue 1; ISSN 2041-1723
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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journal | June 2019 |
X-ray magnetic diffraction under high pressure
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journal | June 2019 |
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