Magnetization study of the UNi1-xCoxGa solid solutions

被引:4
作者
Andreev, AV
Sechovsky, V
Chernyavsky, A
Vejpravová, J
Krylov, VI
Delyagin, NN
机构
[1] Charles Univ, Dept Elect Struct, Prague 12116 2, Czech Republic
[2] ASCR, Inst Phys, Prague 18221 8, Czech Republic
[3] Moscow MV Lomonosov State Univ, Inst Nucl Phys, Moscow 119992, Russia
关键词
actinide compounds; transition metal compounds; magnetically ordered materials; magnetic measurements;
D O I
10.1016/S0925-8388(02)01351-8
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Results of a crystal-structure and magnetization study of UNi1-xCoxGa solid solutions are presented. All compounds over the entire concentration range have been found to crystallize in the hexagonal ZrNiAl-type structure. The concentration dependences of the lattice parameters a and c are linear on intervals x<0.6 and x>0.7 but they considerably change their slope around x=0.6-0.7, which is probably due to preferential occupation of the two non-equivalent transition-metal sites by the Ni and Co atoms. The lattice volume, however, does not show such an anomaly. Magnetization data are interpreted in terms of a sudden conversion of antiferromagnetism in UNiGa to ferromagnetism induced by substituting 2% of Co atoms for Ni without apparent change of the magnetic moment and magnetic ordering temperature. All compounds with xgreater than or equal to0.02 show clear attributes of ferromagnets. Whereas the magnetic moment more or less monotonously decreases with increasing Co concentration the values of Curie temperature pass through a broad minimum in the intermediate Ni-Co concentration region. Since the high-field differential susceptibility exhibits a pronounced maximum in this concentration region, microscopic magnetic inhomogeneities (freezing of antiferromagnetically coupled regions) due to substitutional disorder in the Ni-Co sublattice may be a possible mechanism responsible for the non-monotonous evolution of T-C values. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:54 / 58
页数:5
相关论文
共 16 条
[1]   MAGNETIC-PROPERTIES OF UGACO [J].
ANDREEV, AV ;
HAVELA, L ;
ZELENY, M ;
HREBIK, J .
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE, 1984, 82 (01) :191-194
[2]   Ferromagnetism in the UCo1-xRuxAl quasiternary intermetallics [J].
Andreev, AV ;
Havela, L ;
Sechovsky, V ;
Bartashevich, MI ;
Sebek, J ;
Dremov, RV ;
Kozlovskaya, IK .
PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES, 1997, 75 (06) :827-844
[3]   MAGNETIC-PROPERTIES OF NONSTOICHIOMETRIC UNIGA [J].
ANDREEV, AV ;
HAVELA, L ;
SECHOVSKY, V ;
KUZEL, R ;
NAKOTTE, H ;
BUSCHOW, KHJ ;
BRABERS, JHVJ ;
DEBOER, FR ;
BRUCK, E ;
BLOMBERG, M ;
MERISALO, M .
JOURNAL OF ALLOYS AND COMPOUNDS, 1995, 224 (02) :244-248
[4]   MAGNETIC-PROPERTIES OF UCO1-XRUXSN SOLID-SOLUTIONS [J].
ANDREEV, AV ;
KATORI, HA ;
GOTO, T ;
SECHOVSKY, V ;
HAVELA, L .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1995, 140 :1383-1384
[5]   Magnetic phenomena in UNi1-xRhxAl compounds [J].
Andreev, AV ;
Dremov, RV ;
Sechovsky, V ;
Uwatoko, Y ;
Mushnikov, NV ;
Goto, T ;
Prokes, K ;
Shiokawa, Y ;
Homma, Y ;
Hagmusa, IH ;
Klaasse, JCP .
JOURNAL OF ALLOYS AND COMPOUNDS, 1999, 282 (1-2) :64-71
[6]   Development of magnetism in the UNi1-xRuxAl quasiternary intermetallics [J].
Andreev, AV ;
Bartashevich, MI ;
Goto, T ;
Sechovsky, V ;
Havela, L ;
Dremov, RV .
PHYSICA B, 1998, 246 :468-471
[7]   Magnetic properties of the UCo1-xTxA1 solid solutions (T=Rh and Ir) [J].
Andreev, AV ;
Kozlovskaya, IK ;
Mushnikov, NV ;
Goto, T ;
Sechovsky, V ;
Homma, Y ;
Shiokawa, Y .
JOURNAL OF ALLOYS AND COMPOUNDS, 1999, 284 (1-2) :77-81
[8]   MAGNETIC-ANISOTROPY OF UCOGA [J].
NAKOTTE, H ;
DEBOER, FR ;
HAVELA, L ;
SVOBODA, P ;
SECHOVSKY, V ;
KERGADALLAN, Y ;
SPIRLET, JC ;
REBIZANT, J .
JOURNAL OF APPLIED PHYSICS, 1993, 73 (10) :6554-6556
[9]  
NISHIOKA T, UNPUB J PHYS SOC JAP
[10]   Giant magnetoresistance and magnetic phase diagram of UNiGa [J].
Prokes, K ;
Bruck, E ;
deBoer, FR ;
Mihalik, M ;
Menovsky, A ;
Burlet, P ;
Mignot, JM ;
Havela, L ;
Sechovsky, V .
JOURNAL OF APPLIED PHYSICS, 1996, 79 (08) :6396-6398