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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.

SUBMITTER: Hayashida S 

PROVIDER: S-EPMC6799980 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature

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Novel excitations near quantum criticality in geometrically frustrated antiferromagnet CsFeCl<sub>3</sub>.

Hayashida Shohei S   Matsumoto Masashige M   Hagihala Masato M   Kurita Nobuyuki N   Tanaka Hidekazu H   Itoh Shinichi S   Hong Tao T   Soda Minoru M   Uwatoko Yoshiya Y   Masuda Takatsugu T  

Science advances 20191018 10

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 g  ...[more]

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