A relation between the zero-bias conductance and spin polarization in ferromagnetic metal/d-wave superconductor junctions

• Published in: Physica. C, Superconductivity Vol. 367; no. 1; pp. 165 - 169
• Main Authors: Yoshida, Nobukatsu, Itoh, Hiroyoshi, Hirai, Takashi, Tanaka, Yukio, Inoue, Jun-ichiro, Kashiwaya, Satoshi
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15-02-2002
• Subjects: Andreev reflection; d-Wave superconductor; Spin polarization; Zero-energy states; Spin polarization; Zero-energy states; Andreev reflection; 74.50.+r; d-Wave superconductor
• ISSN: 0921-4534; 1873-2143
• DOI: 10.1016/S0921-4534(01)01001-2

The relation between the zero-bias conductance and spin polarization in ferromagnetic metal/d-wave superconductor junctions is studied theoretically. It is found that, in the presence of the zero-energy states (ZES), the spin polarization of the ferromagnetic metal at low temperatures hardly depends on the magnitude of the barrier potential in contrast to that in the absence of ZES. The obtained results suggest that junctions comprised of Mn oxides compounds and high-
T
c superconductor make it possible to measure the spin polarization of Mn oxides.