Determination of the spin polarization of half-metallic CrO(2) by point contact Andreev reflection.
نویسندگان
چکیده
Andreev reflection at a Pb/CrO(2) point contact has been used to determine the spin polarization of single-crystal CrO(2) films made by chemical vapor deposition. The spin polarization is found to be 0.96 +/- 0.01, which confirms that CrO(2) is a half-metallic ferromagnet, as theoretically predicted.
منابع مشابه
Synthesis and physical properties of arc melted NiMnSb
Several polycrystalline samples of the half-Heusler alloy NiMnSb were grown by arc melting of stoichiometric and nonstoichiometric amounts of high-purity constituent elements. The structure and the phase-purity of the prepared samples were examined systematically by powder x-ray diffraction. The transport properties of the best sample, with saturation magnetization M s(5 K) 54 mB/formula unit, ...
متن کاملOrigin of high transport spin polarization in La0.7Sr0.3MnO3: Direct evidence for minority spin states
Using the point-contact Andreev reflection technique, we have carried out a systematic study of the spin polarization in the colossal magnetoresistive manganite, La0.7Sr0.3MnO3 ~LSMO!. Surprisingly, we observed a significant increase in the current spin polarization with the residual resistivity. This counterintuitive trend can be understood as a transition from ballistic to diffusive transport...
متن کاملHigh Fermi-level spin polarization in the (Bi1−xSbx)2Te3 family of topological insulators: A point contact Andreev reflection study
Point contact Andreev reflection spectroscopy is employed to extract the effective Fermi-level spin polarization of three distinct compositions from the (Bi1−xSbx)2Te3 topological insulator family. The end members, Bi2Te3 and Sb2Te3, exhibit high polarization of 70(4)% and 57(3)%, respectively. High-field (μ0H = 14 T) point contact spectroscopy shows carrier depletion close to the Fermi level f...
متن کاملTransport spin polarisation in SrRuO3 measured through Point Contact Andreev reflection
We report a study in which Andreev reflection using a Nb point contact is used to measure the transport spin polarisation of the 4d itinerant ferromagnet SrRuO3. By performing the study in high quality thin films with residual resistivities less than 7μΩ-cm, we ensure that the study is done in the ballistic limit, a regime which is difficult to reach in oxide ferromagnets. The degree of transpo...
متن کاملMeasuring the spin polarization of a metal with a superconducting point contact
A superconducting point contact is used to determine the spin polarization at the Fermi energy of several metals. Because the process of supercurrent conversion at a superconductor-metal interface (Andreev reflection) is limited by the minority spin population near the Fermi surface, the differential conductance of the point contact can reveal the spin polarization of the metal. This technique ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Physical review letters
دوره 86 24 شماره
صفحات -
تاریخ انتشار 2001