Quantum critical behavior in the heavy Fermion single crystal Ce(Ni$_{0.935}$Pd$_{0.065}$)$_2$Ge$_2$
| Autor: | Wang, C. H., Lawrence, J. M., Christianson, A. D., Chang, S., Gofryk, K., Bauer, E. D., Ronning, F., Thompson, J. D., McClellan, K. J., Rodriguez-Rivera, J. A., Lynn, J. W. |
|---|---|
| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | J. Phys.: Conf. Ser. 273, 012018 (2011) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/1742-6596/273/1/012018 |
| Popis: | We have performed magnetic susceptibility, specific heat, resistivity, and inelastic neutron scattering measurements on a single crystal of the heavy Fermion compound Ce(Ni$_{0.935}$Pd$_{0.065}$)$_2$Ge$_2$, which is believed to be close to a quantum critical point (QCP) at T = 0. At lowest temperature(1.8-3.5 K), the magnetic susceptibility behaves as $\chi(T)-\chi (0)$ $\propto$ $T^{-1/6}$ with $\chi (0) = 0.032 \times 10^{-6}$ m$^3$/mole (0.0025 emu/mole). For $T<$ 1 K, the specific heat can be fit to the formula $\Delta C/T = \gamma_0 - T^{1/2}$ with $\gamma_0$ of order 700 mJ/mole-K$^2$. The resistivity behaves as $\rho = \rho_0 + AT^{3/2}$ for temperatures below 2 K. This low temperature behavior for $\gamma (T)$ and $\rho (T)$ is in accord with the SCR theory of Moriya and Takimoto\cite{Moriya}. The inelastic neutron scattering spectra show a broad peak near 1.5 meV that appears to be independent of $Q$; we interpret this as Kondo scattering with $T_K =$ 17 K. In addition, the scattering is enhanced near $Q$=(1/2, 1/2, 0) with maximum scattering at $\Delta E$ = 0.45 meV; we interpret this as scattering from antiferromagnetic fluctuations near the antiferromagnetic QCP. Comment: to be published in J. Phys: Conference Series |
| Databáze: | arXiv |
| Externí odkaz: |
|