Magnetic Field and Pressure Phase Diagrams of Uranium Heavy-Fermion Compound U2Zn17

概要

論文の詳細を見る
We have performed magnetization measurements at high magnetic fields of up to 53 T on single crystals of a uranium heavy-fermion compound U2Zn17 grown by the Bridgman method. In the antiferromagnetic state below the Néel temperature T_{\text{N}}=9.7 K, a metamagnetic transition is found at H_{\text{c}}\simeq 32 T for the field along the [11\bar{2}0] direction (a-axis). The magnetic phase diagram for the field along the [11\bar{2}0] direction is given. The magnetization curve shows a nonlinear increase at H_{\text{m}}\simeq 35 T in the paramagnetic state above T_{\text{N}} up to a characteristic temperature T_{\chi\text{max}} where the magnetic susceptibility or electrical resistivity shows a maximum value. This metamagnetic behavior of the magnetization at H_{\text{m}} is discussed in comparison with the metamagnetic magnetism of the heavy-fermion super conductors UPt3, URu2Si2, and UPd2Al3. We have also carried out high-pressure resistivity measurement on U2Zn17 using a diamond anvil cell up to 8.7 GPa. Noble gas argon was used as a pressure-transmitting medium to ensure a good hydrostatic environment. The Néel temperature T_{\text{N}} is almost pressure-independent up to 4.7 GPa and starts to increase in the higher-pressure region. The pressure dependences of the coefficient of the T^{2} term in the electrical resistivity A, the antiferromagnetic gap \Delta, and the characteristic temperature T_{\rho\text{max}} are discussed. It is found that the effect of pressure on the electronic states in U2Zn17 is weak compared with those in the other heavy fermion compounds.
2011-01-15

Magnetic Field and Pressure Phase Diagrams of Uranium Heavy-Fermion Compound U2Zn17

スポンサーリンク

概要

著者

関連論文

スポンサーリンク