Abstract:
: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.
journal_name
Sci Advjournal_title
Science advancesauthors
Hayashida S,Matsumoto M,Hagihala M,Kurita N,Tanaka H,Itoh S,Hong T,Soda M,Uwatoko Y,Masuda Tdoi
10.1126/sciadv.aaw5639subject
Has Abstractpub_date
2019-10-18 00:00:00pages
eaaw5639issue
10issn
2375-2548pii
aaw5639journal_volume
5pub_type
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