Spinon excitations in the quasi-one-dimensional S=1/2 chain compound Cs4CuSb2Cl12

Tran, Thao T.1,2; Pocs, Chris A.3; Zhang, Yubo4,5; Winiarski, Michal J.1,6; Sun, Jianwei4; Lee, Minhyea3; McQueen, Tyrel M.1,7

2020-06

10.1103/PhysRevB.101.235107

PHYSICAL REVIEW B   影响因子和分区

2469-9950

2469-9969

The spin-1/2 Heisenberg antiferromagnetic chain is ideal for realizing one of the simplest gapless quantum spin liquids (QSLs), supporting a many-body ground state whose elementary excitations are fractional fermionic excitations called spinons. Here we report the discovery of such a one-dimensional (1D) QSL in Cs4CuSb2Cl12. Compared to previously reported S = 1/2 1D chains, this material possesses a wider temperature range over which the QSL state is stabilized. We identify spinon excitations extending at T > 0.8 K, with a large T-linear contribution to the specific heat, gamma = 31.5(2) mJ mol(-1 )K(-2), which contribute itinerantly to thermal transport up to temperatures as high as T = 35 K. At T = 0.7 K, we find a second-order phase transition that is unchanged by a mu H-0 = 5T magnetic field. Cs4CuSb2Cl12 reveals new phenomenology deep in the 1D QSL regime, supporting a gapped QSL phase over a wide temperature range compared to many other experimental realizations.

SCI ; EI

英语

其他

Institute for Quantum Matter, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences[DE-SC0019331] ; National Science Foundation, Division of Materials Research[0821005] ; U.S. Department of Energy under EPSCoR Grant[DE-SC0012432] ; National Science Foundation[DMR-1644779]

Materials Science ; Physics

Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:000537151200007

AMER PHYSICAL SOC

20202708882674

Quantum theory ; Antimony compounds ; Cesium compounds ; Specific heat ; Chlorine compounds ; Ground state

Thermodynamics:641.1 ; Quantum Theory; Quantum Mechanics:931.4

PHYSICS

Web of Science

1.Johns Hopkins Univ, Inst Quantum Matter, Dept Chem, Dept Phys & Astron, Baltimore, MD 21218 USA
2.Clemson Univ, Dept Chem, Clemson, SC 29634 USA
3.Univ Colorado, Dept Phys, Boulder, CO 80309 USA
4.Tulane Univ, Dept Phys & Engn Phys, New Orleans, LA 70118 USA
5.Southern Univ Sci & Technol China, Dept Phys, Shenzhen 518055, Peoples R China
6.Gdansk Univ Technol, Adv Mat Ctr, Fac Appl Phys & Math, Narutowicza 11-12, PL-80233 Gdansk, Poland
7.Johns Hopkins Univ, Dept Mat Sci & Engn, Baltimore, MD 21218 USA

Tran, Thao T.,Pocs, Chris A.,Zhang, Yubo,et al. Spinon excitations in the quasi-one-dimensional S=1/2 chain compound Cs4CuSb2Cl12[J]. PHYSICAL REVIEW B,2020,101(23).

Tran, Thao T..,Pocs, Chris A..,Zhang, Yubo.,Winiarski, Michal J..,Sun, Jianwei.,...&McQueen, Tyrel M..(2020).Spinon excitations in the quasi-one-dimensional S=1/2 chain compound Cs4CuSb2Cl12.PHYSICAL REVIEW B,101(23).

Tran, Thao T.,et al."Spinon excitations in the quasi-one-dimensional S=1/2 chain compound Cs4CuSb2Cl12".PHYSICAL REVIEW B 101.23(2020).