Abstract
We study the magnetic properties of the metallic kagome system (Fe1-xCox)Sn by a combination of muon spin relaxation (μSR), magnetic susceptibility, and scanning tunneling microscopy (STM) measurements in single crystal specimens with Co concentrations x=0,0.11,0.8. In the undoped antiferromagnetic compound FeSn, we find possible signatures for a previously unidentified phase that sets in at T∗∼50K, well beneath the Neel temperature TN∼376K, as indicated by a peak in the relaxation rate 1/T1 observed in zero field (ZF) and longitudinal field (LF) μSR measurements, with a corresponding anomaly in the ac and dc susceptibility, and an increase in the static width 1/T2 in ZF-μSR measurements. No signatures of spatial symmetry breaking are found in STM down to 7 K. Related to the location and motion of muons in FeSn, we confirm a previous report that about 40% of the implanted muons reside at a field-cancelling high symmetry site at T<250K, while an onset of thermal hopping changes the site occupancy at higher temperatures. In Fe0.89Co0.11Sn, where disorder eliminates the field-cancellation effect, all the implanted muons exhibit precession and/or relaxation in the ordered state. In Fe0.2Co0.8Sn, we find canonical spin glass behavior with freezing temperature Tg∼3.5K; the ZF- and LF-μSR time spectra exhibit results similar to those observed in dilute alloy spin glasses CuMn and AuFe, with a critical behavior of 1/T1 at Tg and 1/T1→0 as T→0. The absence of spin dynamics at low temperatures makes a clear contrast to the spin dynamics observed by μSR in many geometrically frustrated spin systems on insulating kagome, pyrochlore, and triangular lattices. The spin glass behavior of CoSn doped with dilute Fe moments is shown to originate primarily from the randomness of doped Fe moments rather than due to geometrical frustration of the underlying lattice.
| Original language | English |
|---|---|
| Article number | 214412 |
| Journal | Physical Review B |
| Volume | 111 |
| Issue number | 21 |
| DOIs | |
| State | Published - Jun 1 2025 |
Funding
We greatly appreciate the support of the personnel at TRIUMF during the measurements. The work at Columbia was supported by the U.S. NSF Grant No. DMR-2104661. S.T.M. measurements are supported by the Office of Basic Energy Sciences, Materials Sciences and Engineering Division, U.S. Department of Energy under Contract No. DE-SC0012704. The single crystal growth at Rice was supported by U.S. DOE, BES under Grant No. DE-SC0012311 and by the Robert A. Welch Foundation under Grant No. C-1839 (P.D.). The work at Princeton University was supported by the Institute for Quantum Matter, an Energy Frontier Research Center funded by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences under Award No. DE-SC0019331. The work in TRIUMF/UBC/SBQMI was financially supported in part by the Max Planck–UBC–UTokyo Center for Quantum Materials and the Canada First Research Excellence Fund, the Quantum Materials and Future Technologies Program, and the Discovery Grant from the Natural Sciences and Engineering Research Council (NSERC) of Canada. Research at McMaster is supported by the NSERC of Canada. R.Q. and J.I. were supported by the U.S. NSF MRSEC program at Columbia through the Center for Precision-Assembled Quantum Materials (DMR-2011738). H.C.L. was supported by the National Key R&D Program of China (Grants No. 2022YFA1403800 and No. 2023YFA1406500) and National Natural Science Foundation of China (Grant No. 12274459). G.Q.Z. has received partial support from the Chinese Academy of Sciences Project for Young Scientists in Basic Research (2022YSBR-048).
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