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Title: Pressure-tuned quantum criticality in the large-D antiferromagnet DTN

Journal Article · · Nature Communications
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [1];  [3]; ORCiD logo [4]; ORCiD logo [4];  [5]; ORCiD logo [5]; ORCiD logo [6];  [7]; ORCiD logo [8]; ORCiD logo [9]; ORCiD logo [1]
  1. Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden (Germany). Dresden High Magnetic Field Laboratory (HLD-EMFL)
  2. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
  3. Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden (Germany). Dresden High Magnetic Field Laboratory (HLD-EMFL); Technische Universität Dresden (Germany)
  4. Kobe Univ. (Japan)
  5. Tohoku Univ., Sendai (Japan). Inst. for Materials Research
  6. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  7. Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland)
  8. Univ. of Sao Paulo (Brazil)
  9. Max Planck Society, Dresden (Germany). Max Planck Inst. for Chemical Physics of Solids

Strongly correlated spin systems can be driven to quantum critical points via various routes. In particular, gapped quantum antiferromagnets can undergo phase transitions into a magnetically ordered state with applied pressure or magnetic field, acting as tuning parameters. These transitions are characterized by z = 1 or z = 2 dynamical critical exponents, determined by the linear and quadratic low-energy dispersion of spin excitations, respectively. Employing high-frequency susceptibility and ultrasound techniques, we demonstrate that the tetragonal easy-plane quantum antiferromagnet NiCl2 · 4SC(NH2)2 (aka DTN) undergoes a spin-gap closure transition at about 4.2 kbar, resulting in a pressure-induced magnetic ordering. The studies are complemented by high-pressure-electron spin-resonance measurements confirming the proposed scenario. Powder neutron diffraction measurements revealed that no lattice distortion occurs at this pressure and the high spin symmetry is preserved, establishing DTN as a perfect platform to investigate z = 1 quantum critical phenomena. The experimental observations are supported by DMRG calculations, allowing us to quantitatively describe the pressure-driven evolution of critical fields and spin-Hamiltonian parameters in DTN.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
AC05-00OR22725; DMR-1644779
OSTI ID:
2333754
Journal Information:
Nature Communications, Vol. 15, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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