Transport properties of Co2CrAl Heusler alloy films

被引：21
作者：
Kudryavtsev, Y. V. [1 ]
Lee, Y. P. [2 ,3 ]
Yoo, Y. J. [2 ,3 ]
Seo, M. S. [2 ,3 ]
Kim, J. M. [2 ,3 ]
Hwang, J. S. [2 ,3 ]
Dubowik, J. [4 ]
Kim, K. W. [5 ]
Choi, E. H. [6 ]
Prokhnenko, O. [7 ]
机构：
[1] Natl Acad Sci Ukraine, Inst Met Phys, UA-252680 Kiev 142, Ukraine
[2] Hanyang Univ, q Psi, Seoul 133791, South Korea
[3] Hanyang Univ, Dept Phys, Seoul 133791, South Korea
[4] Polish Acad Sci, Inst Mol Phys, PL-60179 Poznan, Poland
[5] Sunmoon Univ, Asan 336708, South Korea
[6] Kwangwoon Univ, Seoul 139701, South Korea
[7] Helmholtz Ctr Berlin Mat & Energy Gmbh, D-14109 Berlin, Germany
来源：
EUROPEAN PHYSICAL JOURNAL B | 2012年 / 85卷 / 01期
关键词：
HALF-METALLIC FERROMAGNETS; MAGNETIC-PROPERTIES; ELECTRICAL-RESISTIVITY; ELECTRONIC-STRUCTURE; PHYSICAL-PROPERTIES; EPITAXIAL-GROWTH; BAND-STRUCTURE; THIN-FILMS; CO2MNSI;
D O I：
10.1140/epjb/e2011-20381-9
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The effect of atomic disorder on the electron transport and the magnetoresistance (MR) of Co2CrAl Heusler alloy (HA) films has been investigated. We show that Co2CrAl films with L2(1) order exhibit a negative value for the temperature coefficient of resistivity (TCR) in a temperature range of 10 < T < 290 K, and the temperature dependence of electric conductivity varies as T-3/2 similarly to that of the zero-gap semiconductors. The atomic or the site disorder on the way of L2(1) -> B2 -> A2 -> amorphous state in Co2CrAl HA films causes the deviation from this dependence: reduction in the absolute value of TCR as well as decrease in the resistivity down to rho(T = 293 K) similar to 200 mu Omega cm in comparison to rho(T = 293 K) similar to 230 mu Omega cm typical for the Co2CrAl films with L2(1) order. The magnetic-field dependence of MR of the Co2CrAl films with L2(1) order is determined by two competing contributions: a positive Lorentz scattering and a negative s-d scattering. The atomic disorder in Co2CrAl films drastically changes MR behavior due to its strong influence on the magnetic properties.
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页数：7
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共 38 条
  • [1] Epitaxial growth and magnetic properties of single-crystal Co2MnGe Heusler alloy films on GaAs (001)
    Ambrose, T
    Krebs, JJ
    Prinz, GA
    [J]. APPLIED PHYSICS LETTERS, 2000, 76 (22) : 3280 - 3282
  • [2] POSSIBLE EXPLANATION OF NON-LINEAR CONDUCTIVITY IN THIN-FILM METAL WIRES
    ANDERSON, PW
    ABRAHAMS, E
    RAMAKRISHNAN, TV
    [J]. PHYSICAL REVIEW LETTERS, 1979, 43 (10) : 718 - 720
  • [3] NEGATIVE MAGNETORESISTIVITY IN DILUTE ALLOYS
    BEALMONOD, MT
    WEINER, RA
    [J]. PHYSICAL REVIEW, 1968, 170 (02): : 552 - +
  • [4] de Groot R. A., 2007, HDB MAGNETISM ADV MA, V4
  • [5] Slater-Pauling behavior and origin of the half-metallicity of the full-Heusler alloys
    Galanakis, I
    Dederichs, PH
    Papanikolaou, N
    [J]. PHYSICAL REVIEW B, 2002, 66 (17): : 1 - 9
  • [6] Surface properties of the half- and full-Heusler alloys
    Galanakis, I
    [J]. JOURNAL OF PHYSICS-CONDENSED MATTER, 2002, 14 (25) : 6329 - 6340
  • [7] Structural, magnetic and magnetotransport properties of thin films of the Heusler alloys Cu2MnAl, Co2MnSi, Co2MnGe and Co2MnSn
    Geiersbach, U
    Bergmann, A
    Westerholt, K
    [J]. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2002, 240 (1-3) : 546 - 549
  • [8] Structural and magnetic properties of epitaxial L21-structured Co2(CrFe)Al films grown on GaAs(001) substrates -: art. no. 103714
    Hirohata, A
    Kurebayashi, H
    Okamura, S
    Kikuchi, M
    Masaki, T
    Nozaki, T
    Tezuka, N
    Inomata, K
    [J]. JOURNAL OF APPLIED PHYSICS, 2005, 97 (10)
  • [9] Magnetic and electrical properties of Co2MnGa grown on GaAs (001)
    Holmes, SN
    Pepper, M
    [J]. APPLIED PHYSICS LETTERS, 2002, 81 (09) : 1651 - 1653
  • [10] Temperature dependence of the anomalous Hall conductivity in the Heusler alloy Co2CrAl
    Husmann, A.
    Singh, L. J.
    [J]. PHYSICAL REVIEW B, 2006, 73 (17):
1234