Formation of gapless triplets in the bond-doped spin-gap antiferromagnet (C$_4$H$_{12}$N$_2$)(Cu$_2$Cl$_6$)
| Autor: | Glazkov, V. N., Skoblin, G., Hüvonen, D., Yankova, T. S., Zheludev, A. |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | J. Phys.: Condens. Matter 26, 486002 (2014) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/0953-8984/26/48/486002 |
| Popis: | We report results of an electron spin resonance (ESR) study of a spin-gap antiferromagnet (C$_4$H$_{12}$N$_2$)(Cu$_2$Cl$_6$) (nicknamed PHCC) with chlorine ions partially substituted by bromine. We found that up to 10% of nominal doping the contribution of the random defects to the absorption spectra remains at about 0.1% per copper ion, almost the same as in the pure system. Instead, a particular kind of ESR absorption corresponding to gapless S=1 triplets is observed at low temperatures in samples with high nominal bromine content x>5%. Increase of bromine concentration also leads to the systematic broadening of ESR absorption line indicating reduction of the quasi-particles lifetime. Comment: This is an author-created, un-copyedited version of an article accepted for publication in Journal of Physics: Condenses Matetr. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at doi:10.1088/0953-8984/26/48/486002 |
| Databáze: | arXiv |
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