一氮化铀变磁高场相变时的费米面重构
Fermi-surface reconstruction at the metamagnetic high-field transition in uranium mononitride
摘要：
本文报道了具有Néel温度$T_N\approx 53\,$ K的反铁磁金属一氮化铀的电子和热力学性质。从单晶的微结构的制造使我们能够研究低温变磁转变在约$58\,$ T的高精度磁输运，霍尔效应，和磁转矩测量。我们证实了高场过渡从一个广泛的和复杂的行为到一个尖锐的一阶阶样的步骤，在低温下与自旋翻转的演变。在高场状态下，磁贡献的电阻率的温度依赖性被完全抑制。它在低温下演变成几乎二次相关性，表明金属特性。我们的详细调查的霍尔效应提供了一个突出的费米面重建的系统被推入高场状态的证据。
英文摘要：
We report on the electronic and thermodynamic properties of the antiferromagnetic metal uranium mononitride with a Néel temperature $T_N\approx 53\,$K. The fabrication of microstructures from single crystals enables us to study the low-temperature metamagnetic transition at approximately $58\,$T by high-precision magnetotransport, Hall-effect, and magnetic-torque measurements. We confirm the evolution of the high-field transition from a broad and complex behavior to a sharp first-order-like step, associated with a spin flop at low temperature. In the high-field state, the magnetic contribution to the temperature dependence of the resistivity is suppressed completely. It evolves into an almost quadratic dependence at low temperatures indicative of a metallic character. Our detailed investigation of the Hall effect provides evidence for a prominent Fermi-surface reconstruction as the system is pushed into the high-field state.
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