Disorder-sensitive phase formation linked to metamagnetic quantum criticality
Disorder-sensitive phase formation linked to metamagnetic quantum criticality
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DOI：
10.1126/science.1104306
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发表时间：
2004-11-12
期刊：
影响因子：
56.9
通讯作者：
Mackenzie, AP
中科院分区：
文献类型：
--
作者：
Grigera, SA;Gegenwart, P;Mackenzie, AP
强相互作用电子的凝聚系统是研究量子复杂性的理想选择。通过明确地将系统调整到特殊的低温量子临界点，可以促进新量子相的形成。到目前为止，最明显的例子是在压力调节的反铁磁量子临界点附近出现超导性。我们提出了在钌金属 Sr3Ru2O7 超纯晶体中磁场调谐量子临界点附近形成非超导相的实验证据，并讨论了观察到的相是由于自旋相关的对称破缺费米表面畸变引起的可能性。
Condensed systems of strongly interacting electrons are idea[ for the study of quantum complexity. It has become possible to promote the formation of new quantum phases by explicitly tuning systems toward special low-temperature quantum critical points. So far, the clearest examples have been appearances of superconductivity near pressure-tuned antiferromagnetic quantum critical points. We present experimental evidence for the formation of a non-superconducting phase in the vicinity of a magnetic field-tuned quantum critical point in ultrapure crystals of the ruthenate metal Sr3Ru2O7,and we discuss the possibility that the observed phase is due to a spin-dependent symmetry-breaking Fermi surface distortion.