Long-range order and spin-liquid states of polycrystalline Tb$_{2+x}$Ti$_{2-x}$O$_{7+y}$
| Autor: | Taniguchi, T., Kadowaki, H., Takatsu, H., Fåk, B., Ollivier, J., Yamazaki, T., Sato, T. J., Yoshizawa, H., Shimura, Y., Sakakibara, T., Hong, T., Goto, K., Yaraskavitch, L. R., Kycia, J. B. |
|---|---|
| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 87, 060408(R) (2013) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.87.060408 |
| Popis: | Low-temperature states of polycrystalline samples of a frustrated pyrochlore oxide Tb$_{2+x}$Ti$_{2-x}$O$_{7+y}$ have been investigated by specific heat, magnetic susceptibility, and neutron scattering experiments. We have found that this system can be tuned by a minute change of $x$ from a spin-liquid state ($x < x_{\text{c}}$) to a partly ordered state with a small antiferromagnetic ordering of the order of $0.1 \mu_{\text{B}}$. Specific heat shows a sharp peak at a phase transition at $T_{\text{c}}= 0.5$ K for $x=0.005$. Magnetic excitation spectra for this sample change from a quasielastic to a gapped type through $T_{\text{c}}$. The possibility of a Jahn-Teller transition is discussed. Comment: 5 pages, 5 figures; Fig.1 replaced |
| Databáze: | arXiv |
| Externí odkaz: |
|