期刊
PHYSICAL REVIEW LETTERS
卷 128, 期 15, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.128.157202
关键词
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资金
- NSERC
- Rice University Consortium for Processes in Porous Media
- U.S. Department of Energy (DOE) , Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division [DE-AC02-76SF00515]
- NSF Graduate Research Fellowship [DGE-1656518]
Using Br-79 nuclear quadrupole resonance (NQR), we found that ultraslow lattice dynamics and lattice distortions occur at low temperatures in the kagome lattice Heisenberg antiferromagnet Zn-barlowite. In addition, nuclear spin pairing was observed in the frozen lattice.
We use Br-79 nuclear quadrupole resonance (NQR) to demonstrate that ultraslow lattice dynamics set in below the temperature scale set by the Cu-Cu superexchange interaction J (similar or equal to 160 K) in the kagome lattice Heisenberg antiferromagnet Zn-barlowite. The lattice completely freezes below 50 K, and Br-79 NQR line shapes become twice broader due to increased lattice distortions. Moreover, the frozen lattice exhibits an oscillatory component in the transverse spin echo decay, a typical signature of pairing of nuclear spins by indirect nuclear spin-spin interaction. This indicates that some Br sites form structural dimers via a pair of kagome Cu sites prior to the gradual emergence of spin singlets below similar to 30 K Our findings underscore the significant roles played by subtle structural distortions in determining the nature of the disordered magnetic ground state of the kagome lattice.
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