High field magnetotransport and point contact Andreev reflection measurements on CuCr{sub 2}Se{sub 4} and CuCr{sub 2}Se{sub 3}Br—Degenerate magnetic semiconductor single crystals

Journal Article · Wed May 07 00:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4861683· OSTI ID:22273857

Coey, J. M. D.; Stamenov, P. ^[1]; Alaria, J. ^[2]

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1. School of Physics and CRANN, Trinity College, Dublin 2 (Ireland)
2. Department of Physics, University of Liverpool, Liverpool L69 7ZE (United Kingdom)

Single crystals of the metallically degenerate fully magnetic semiconductors CuCr{sub 2}Se{sub 4} and CuCr{sub 2}Se{sub 3}Br have been prepared by the Chemical Vapour Transport method, using either Se or Br as transport agents. The high-quality, millimetre-sized, octahedrally faceted, needle- and platelet-shaped crystals are characterised by means of high field magnetotransport (μ{sub 0}H≤ 14 T) and Point Contact Andreev Reflection. The relatively high spin polarisation observed |P|>0.56, together with the relatively low minority carrier effective mass of 0.25 m{sub e}, and long scattering time  10{sup −13} s, could poise these materials for integration in low- and close-to-room temperature minority injection bipolar heterojunction transistor demonstrations.

• OSTI ID: 22273857
• Journal Information: Journal of Applied Physics, Vol. 115, Issue 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHARGE CARRIERS
CHROMIUM SELENIDES
COPPER BROMIDES
EFFECTIVE MASS
ELECTRIC CONTACTS
HETEROJUNCTIONS
MAGNETIC SEMICONDUCTORS
MAGNETORESISTANCE
MONOCRYSTALS
POLARIZATION
REFLECTION
SPIN
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0273-0400 K
VAPORS