Novel excitations near quantum criticality in geometrically frustrated antiferromagnet CsFeCl3

被引：15

作者：

Hayashida, Shohei ^{[1
,6
]}

Matsumoto, Masashige ^{[2
]}

Hagihala, Masato ^{[1
,7
]}

Kurita, Nobuyuki ^{[3
]}

Tanaka, Hidekazu ^{[3
]}

Itoh, Shinichi ^{[4
]}

Hong, Tao ^{[5
]}

Soda, Minoru ^{[1
,8
]}

Uwatoko, Yoshiya ^{[1
]}

Masuda, Takatsugu ^{[1
]}

机构：

[1] Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan

[2] Shizuoka Univ, Dept Phys, Shizuoka 4228529, Japan

[3] Tokyo Inst Technol, Dept Phys, Meguro Ku, Tokyo 1528551, Japan

[4] High Energy Accelerator Res Org, Inst Mat Struct Sci, Neutron Sci Div, Tsukuba, Ibaraki 3050801, Japan

[5] Oak Ridge Natl Lab, Neutron Scattering Div, Oak Ridge, TN 37831 USA

[6] Swiss Fed Inst Technol, Solid State Phys Lab, Zurich, Switzerland

[7] High Energy Accelerator Res Org, Inst Mat Struct Sci, Tsukuba, Ibaraki, Japan

[8] RIKEN, Ctr Emergent Matter Sci, Wako, Saitama, Japan

来源：

SCIENCE ADVANCES | 2019年 / 5卷 / 10期

基金：

日本学术振兴会;

关键词：

NEUTRON-SCATTERING SPECTRA; HIGGS AMPLITUDE MODE; PHASE; MAGNETISM; STATE;

D O I：

10.1126/sciadv.aaw5639

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页数：5

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