Xiong Y M, Adams P W, Catelani G
Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA.
Phys Rev Lett. 2009 Aug 7;103(6):067009. doi: 10.1103/PhysRevLett.103.067009.
We show that the pairing resonance in the Pauli-limited normal state of ultrathin superconducting Al films provides a spin-resolved probe of conduction-electron polarization in thin magnetic films. A superconductor-insulator-ferromagnet tunneling junction is used to measure the density of states in supercritical parallel magnetic fields that are well beyond the Clogston-Chandresekhar limit, thus greatly extending the field range of the tunneling density of states technique. The applicability and limitations of using the pairing resonance as a spin probe are discussed.
我们表明，超薄超导铝膜的泡利极限正常态中的配对共振为薄磁膜中的传导电子极化提供了一种自旋分辨探针。利用超导-绝缘体-铁磁体隧道结来测量超临界平行磁场中的态密度，该磁场远超过克洛斯顿-钱德拉塞卡极限，从而极大地扩展了隧道态密度技术的磁场范围。讨论了将配对共振用作自旋探针的适用性和局限性。
