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Title: Novel excitations near quantum criticality in geometrically frustrated antiferromagnet CsFeCl3

Journal Article · · Science Advances
ORCiD logo [1]; ORCiD logo [2];  [3];  [4];  [4];  [5]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [8]; ORCiD logo [8]
  1. The Univ. of Tokyo, Chiba (Japan); ETH Zurich, Zurich (Switzerland)
  2. Shizuoka Univ., Shizuoka (Japan)
  3. The Univ. of Tokyo, Chiba (Japan); High Energy Accelerator Research Organization, Tsukuba (Japan)
  4. Tokyo Inst. of Technology, Tokyo (Japan)
  5. High Energy Accelerator Research Organization, Ibaraki (Japan)
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  7. The Univ. of Tokyo, Chiba (Japan); RIKEN Center for Emergent Matter Science, Wako (Japan)
  8. The Univ. of Tokyo, Chiba (Japan)
+ Show Author Affiliations

The investigation of materials that exhibit quantum phase transition provides valuable insights into fundamental problems in physics. We present neutron scattering under pressure in a triangular-lattice antiferromagnet that has a quantum disorder in the low-pressure phase and a noncollinear structure in the high-pressure phase. The neutron spectrum continuously evolves through critical pressure; a single mode in the disordered state becomes soft with the pressure and it splits into gapless and gapped modes in the ordered phase. Extended spin-wave theory reveals that the longitudinal and transverse fluctuations of spins are hybridized in the modes because of noncollinearity, and previously unidentified magnetic excitations are formed. We report a new hybridization of the phase and amplitude fluctuations of the order parameter near a quantum critical point in a spontaneously symmetry-broken state.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1571849
Journal Information:
Science Advances, Journal Name: Science Advances Journal Issue: 10 Vol. 5; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

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