Disorder-induced spin-liquid-like behavior in kagome-lattice compounds

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dc.contributor.authorMa, Zen_AU
dc.contributor.authorDong, ZYen_AU
dc.contributor.authorWu, Sen_AU
dc.contributor.authorZhu, Yen_AU
dc.contributor.authorBao, Sen_AU
dc.contributor.authorCai, Zen_AU
dc.contributor.authorWang, Wen_AU
dc.contributor.authorShangguan, Yen_AU
dc.contributor.authorWang, Jen_AU
dc.contributor.authorRan, Ken_AU
dc.contributor.authorYu, DHen_AU
dc.contributor.authorDeng, GCen_AU
dc.contributor.authorMole, RAen_AU
dc.contributor.authorLi, HFen_AU
dc.contributor.authorYu, SLen_AU
dc.contributor.authorLi, JXen_AU
dc.contributor.authorWen, JSen_AU
dc.date.accessioned2024-12-06T02:33:40Zen_AU
dc.date.available2024-12-06T02:33:40Zen_AU
dc.date.issued2020-12-15en_AU
dc.date.statistics2024-11-07en_AU
dc.descriptionThe work was supported by the National Natural Science Foundation of China with Grants No. 11822405, No. 12074174, No. 11674157, No. 11674158, No. 11774152, No. 11904170, No. 12004249, and No. 12004251, National Key Projects for Research and Development of China with Grant No. 2016YFA0300401, Natural Science Foundation of Jiangsu Province with Grants No. BK20180006 and No. BK20190436, Shanghai Sailing Program with Grant No. 20YF1430600, Fundamental Research Funds for the Central Universities with Grant No. 020414380117, and the Office of International Cooperation and Exchanges of Nanjing University. H.-F.L. acknowledges financial support from the Science and Technology Development Fund, Macau SAR (Files No. 028/2017/A1 and No. 0051/2019/AFJ). We acknowledge stimulating discussions with Itamar Kimchi. We thank the ACNS at ANSTO for the access of neutron-scattering facilities through Proposals No. 7312 and No. 7314, and the excellent support from Gene Davidson from the Sample Environment Group for setting up the dilution refrigerator on PELICAN.en_AU
dc.description.abstractQuantum spin liquids (QSLs) are an exotic state of matter that is subject to extensive research. However, the relationship between the ubiquitous disorder and the QSL behaviors is still unclear. Here, by performing comparative experimental studies on two kagomé-lattice QSL candidates, Tm3Sb3Zn2O14 and Tm3Sb3Mg2O14, which are isostructural to each other but with strong and weak structural disorder, respectively, we show unambiguously that the disorder can induce spin-liquid-like features. In particular, both compounds show dominant antiferromagnetic interactions with a Curie-Weiss temperature of -17.4 and -28.7 K for Tm3Sb3Zn2O14 and Tm3Sb3Mg2O14, respectively, but remain disordered down to about 0.05 K. Specific-heat results suggest the presence of gapless magnetic excitations characterized by a residual linear term. Magnetic excitation spectra obtained by inelastic neutron scattering (INS) at low temperatures display broad continua. All these observations are consistent with those of a QSL. However, we find in Tm3Sb3Zn2O14, which has strong disorder resulting from the random mixing of the magnetic Tm3+ and nonmagnetic Zn2+, that the low-energy magnetic excitations observed in the specific-heat and INS measurements are substantially enhanced compared to those of Tm3Sb3Mg2O14, which has much less disorder. We believe that the effective spins of the Tm3+ ions in the Zn2+/Mg2+ sites give rise to the low-energy magnetic excitations, and the amount of the occupancy determines the excitation strength. These results provide direct evidence of the mimicry of a QSL caused by disorder. ©2020 American Physical Society.en_AU
dc.identifier.articlenumber224415en_AU
dc.identifier.citationMa, Z., Dong, Z.-Y., Wu, S., Zhu, Y., Bao, S., Cai, Z., Wang, W., Shangguan, Y., Wang, J., Ran, K., Yu, D., Deng, G., Mole, R. A., Li, H.-F., Yu, S.-L., Li, J.-X., & Wen, J. (2020). Disorder-induced spin-liquid-like behavior in kagome-lattice compounds. Physical Review B, 102(22), 224415. doi:10.1103/PhysRevB.102.224415en_AU
dc.identifier.issn2469-9950en_AU
dc.identifier.issn2469-9969en_AU
dc.identifier.issue22en_AU
dc.identifier.journaltitlePhysical Review Ben_AU
dc.identifier.urihttps://doi.org/10.1103/physrevb.102.224415en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15805en_AU
dc.identifier.volume102en_AU
dc.languageEnglishen_AU
dc.language.isoenen_AU
dc.publisherAmerican Physical Society (APS)en_AU
dc.subjectSpinen_AU
dc.subjectLiquidsen_AU
dc.subjectThuliumen_AU
dc.subjectAntimonyen_AU
dc.subjectZincen_AU
dc.subjectMagnesiumen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectTemperature rangeen_AU
dc.subjectIonsen_AU
dc.titleDisorder-induced spin-liquid-like behavior in kagome-lattice compoundsen_AU
dc.typeJournal Articleen_AU
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