Absence of magnetic thermal conductivity in the quantum spin liquid candidate YbMgGaO4
| Autor: | Xu, Y., Zhang, J., Li, Y. S., Yu, Y. J., Hong, X. C., Zhang, Q. M., Li, S. Y. |
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| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | Physical Review Letters 117, 267202 (2016) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.117.267202 |
| Popis: | We present the ultra-low-temperature specific heat and thermal conductivity measurements on the single crystals of YbMgGaO$_4$, which was recently argued to be a promising candidate for quantum spin liquid (QSL). In the zero magnetic field, a large magnetic contribution of specific heat is observed, and exhibits a power-law temperature dependence ($C_m \sim T^{0.74}$). On the contrary, we do not observed any significant contribution of thermal conductivity from magnetic excitations. In magnetic fields $H \ge$ 6 T, the exponential $T$-dependence of $C_m$ and the enhanced thermal conductivity indicate a magnon gap of the fully-polarized state. The absence of magnetic thermal conductivity at the zero field in this QSL candidate puts a strong constraint on the theories of its ground state. Comment: 6 pages, 3 figures, accepted for publication in Physical Review Letters |
| Databáze: | arXiv |
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