Green A G, Grigera S A, Borzi R A, Mackenzie A P, Perry R S, Simons B D
School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, United Kingdom.
Phys Rev Lett. 2005 Aug 19;95(8):086402. doi: 10.1103/PhysRevLett.95.086402. Epub 2005 Aug 16.
The bilayer ruthenate Sr3Ru2O7 has been cited as a textbook example of itinerant metamagnetic quantum criticality. However, recent studies of the ultrapure system have revealed striking anomalies in magnetism and transport in the vicinity of the quantum critical point. Drawing on fresh experimental data, we show that the complex phase behavior reported here can be fully accommodated within the framework of a simple Landau theory. We discuss the potential physical mechanisms that underpin the phenomenology, and assess the capacity of the ruthenate system to realize quantum tricritial behavior.
双层钌酸盐Sr3Ru2O7被视为巡游变磁性量子临界性的一个经典实例。然而，近期对超纯体系的研究揭示了量子临界点附近磁性和输运方面显著的异常现象。基于新的实验数据，我们表明这里报道的复杂相行为可以在简单朗道理论的框架内得到充分解释。我们讨论了支撑该现象学的潜在物理机制，并评估了钌酸盐体系实现量子三临界行为的能力。
