Novel excitations near quantum criticality in geometrically frustrated antiferromagnet CsFeCl3.

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 Adv

journal_title

Science advances

authors

Hayashida S,Matsumoto M,Hagihala M,Kurita N,Tanaka H,Itoh S,Hong T,Soda M,Uwatoko Y,Masuda T

doi

10.1126/sciadv.aaw5639

subject

Has Abstract

pub_date

2019-10-18 00:00:00

pages

eaaw5639

issue

10

issn

2375-2548

pii

aaw5639

journal_volume

5

pub_type

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