MAGNETIC-ORDERING IN CECU6-XAUX SINGLE-CRYSTALS - THERMODYNAMIC AND TRANSPORT-PROPERTIES

被引:80
作者
SCHLAGER, HG
SCHRODER, A
WELSCH, M
VONLOHNEYSEN, H
机构
[1] Physikalisches Institut der Universität Karlsruhe, Karlsruhe, 7500
关键词
D O I
10.1007/BF00681999
中图分类号
O59 [应用物理学];
学科分类号
摘要
We report on measurements of the magnetization M, specific heat C, resistivity rho, and magnetoresistivity of CeCu6-xAux single crystals (x=0.3 and 0.5) grown by the Czochralski method. Antiferromagnetic ordering is observed in M and C for temperatures less than T(N)=0.48 K (x=0.3) and 0.95 K (x=0.5), similar to the ordering temperatures found previously for polycrystalline samples. As a function of magnetic field B, M(B) and C(T, B) are strongly anisotropic, with the easy axis along the crystallographic c direction (orthorhombic notation) as for pure CeCu6. For large magnetic fields where the magnetic ordering is suppressed, the specific heat can be described by the resonance-level model suggestive of a single-ion Kondo effect, similar to CeCu6 where for large B the short-range magnetic correlations are suppressed. The averaged Kondo temperature as determined from a number of properties decreases with increasing x, with T(K)=4.0 K for x=0.3 and 3.0 K for x=0.5, compared to 5.8 K for x=0. The magnetoresistivity shows a negative contribution arising from incoherent Kondo scattering and a positive contribution associated with the magnetic order.
引用
收藏
页码:181 / 204
页数:24
相关论文
共 48 条
  • [11] MODEL FOR THE ORIENTATION, MAGNETIC-FIELD, AND TEMPERATURE-DEPENDENCE OF THE SPECIFIC-HEAT OF CECU6
    EDELSTEIN, AS
    [J]. PHYSICAL REVIEW B, 1988, 37 (07): : 3808 - 3811
  • [12] EDELSTEIN AS, 1990, PHYSICA B, V163, P504, DOI 10.1016/0921-4526(90)90253-Q
  • [13] RESISTIVE ANOMALIES AT MAGNETIC CRITICAL POINTS
    FISHER, ME
    LANGER, JS
    [J]. PHYSICAL REVIEW LETTERS, 1968, 20 (13) : 665 - &
  • [14] MAGNETIC-BEHAVIOR OF CE(CU1-XAGX)6
    FRAUNBERGER, G
    ANDRAKA, B
    KIM, JS
    AHLHEIM, U
    STEWART, GR
    [J]. PHYSICAL REVIEW B, 1989, 40 (07): : 4735 - 4739
  • [15] SPECIFIC-HEAT OF THE DENSE KONDO COMPOUND CECU6
    FUJITA, T
    SATOH, K
    ONUKI, Y
    KOMATSUBARA, T
    [J]. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1985, 47-8 (FEB) : 66 - 68
  • [16] INCIPIENT MAGNETIC ORDER IN CECU6
    GANGOPADHYAY, AK
    SCHILLING, JS
    SCHUBERTH, E
    GUTSMIEDL, P
    GROSS, F
    ANDRES, K
    [J]. PHYSICAL REVIEW B, 1988, 38 (04): : 2603 - 2607
  • [17] LONG-RANGE MAGNETIC ORDER IN CE(CU1-XAGX)6
    GANGOPADHYAY, AK
    LETTAU, K
    LETTAU, C
    SCHILLING, JS
    SCHUBERTH, E
    FUCHS, W
    ANDRES, K
    DAMENTO, M
    GSCHNEIDNER, KA
    [J]. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1992, 103 (03) : 267 - 273
  • [18] PRESSURE-DEPENDENCE OF MAGNETIC-ORDERING IN A HEAVY-FERMION ALLOY - CECU6-XAUX
    GERMANN, A
    VONLOHNEYSEN, H
    [J]. EUROPHYSICS LETTERS, 1989, 9 (04): : 367 - 372
  • [19] MAGNETIC-ORDERING IN THE HEAVY-FERMION ALLOYS CECU6-CHI-AU-CHI AND CECU6-CHI-AG-CHI
    GERMANN, A
    NIGAM, AK
    DUTZI, J
    SCHRODER, A
    VONLOHNEYSEN, H
    [J]. JOURNAL DE PHYSIQUE, 1988, 49 (C-8): : 755 - 756
  • [20] LATTICE DISTORTION IN CECU6
    GRATZ, E
    BAUER, E
    NOWOTNY, H
    MUELLER, H
    ZEMIRLI, S
    BARBARA, B
    [J]. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1987, 63-4 : 312 - 314