Please use this identifier to cite or link to this item:
Title: High spin polarization and the origin of unique ferromagnetic ground state in CuFeSb
Authors: Sirohi, Anshu
Thakur, Gohil S.
Saha, Preetha
Gayen, Sirshendu
Gaurav, Abhishek
Jyotsna, Shubhra
Haque, Zeba
Gupta, L. C.
Ganguli, Ashok K.
Sheet, Goutam
Dept. of Physics
Keywords: High spin polarization
Unique ferromagnetic
Superconducting ground state
Issue Date: Jun-2016
Publisher: AIP Publishing
Citation: Applied Physics Letters, 108(24), 242411.
Abstract: CuFeSb is isostructural to the ferro-pnictide and chalcogenide superconductors and it is one of the few materials in the family that are known to stabilize in a ferromagnetic ground state. Majority of the members of this family are either superconductors or antiferromagnets. Therefore, CuFeSb may be used as an ideal source of spin polarized current in spin-transport devices involving pnictide and the chalcogenide superconductors. However, for that the Fermi surface of CuFeSb needs to be sufficiently spin polarized. In this paper we report direct measurement of transport spin polarization in CuFeSb by spin-resolved Andreev reflection spectroscopy. From a number of measurements using multiple superconducting tips we found that the intrinsic transport spin polarization in CuFeSb is high (∼47%). In order to understand the unique ground state of CuFeSb and the origin of large spin polarization at the Fermi level, we have evaluated the spin-polarized band structure of CuFeSb through first principles calculations. Apart from supporting the observed 47% transport spin polarization, such calculations also indicate that the Sb-Fe-Sb angles and the height of Sb from the Fe plane are strikingly different for CuFeSb than the equivalent parameters in other members of the same family thereby explaining the origin of the unique ground state of CuFeSb.
ISSN: Mar-51
Appears in Collections:JOURNAL ARTICLES

Files in This Item:
There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.