Pseudogap and transport properties in Fe3-xVxAly (x=0.5-1.05; y=0.95,1.05) -: art. no. 075204

被引:42
作者
Matsushita, A [1 ]
Naka, T
Takano, Y
Takeuchi, T
Shishido, T
Yamada, Y
机构
[1] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan
[2] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
[3] Shimane Univ, Dept Mat Sci, Matsue, Shimane 6908504, Japan
来源
PHYSICAL REVIEW B | 2002年 / 65卷 / 07期
关键词
D O I
10.1103/PhysRevB.65.075204
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We have measured the Hall resistivity for the intermetallic compound Fe3-xVxAly (x = 0.5-1.05; y = 0.95,1.05) at room temperature. The Hall coefficient changed its sign from positive to negative around the Heusler composition (i.e., x = y = 1) with increasing x value or decreasing y value. We have measured the temperature dependence of the Hall coefficient and the electrical resistivity for Fe1.98V1.02Al and quenched Fe1.95V1.05Al in the temperature range of 5-300 K. These two compounds showed very different behavior in the electrical resistivity but the behavior of the Hall coefficient was quite similar. At higher temperatures, the Hall coefficient showed a strong temperature dependence but it approached a constant value at low temperatures suggesting that these compounds are semimetals with a pseudogap. The charge carrier density was found to be less than a few tenths per unit cell. The rise of electrical resistivity at low temperatures is not owing to an energy gap but due to magnetic scattering while the negative temperature coefficient at high temperatures is attributable to pseudogap.
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页数:6
相关论文
共 12 条
[1]   Electronic structure and magnetism of Fe3-xVxX (X=Si, Ga, and Al) alloys by the KKR-CPA method [J].
Bansil, A ;
Kaprzyk, S ;
Mijnarends, PE ;
Tobola, J .
PHYSICAL REVIEW B, 1999, 60 (19) :13396-13412
[2]  
Kittel C., Introduction to Solid State Physics
[3]   Field-dependent specific heat in Fe2VAl and the question of possible 3d heavy fermion behavior [J].
Lue, CS ;
Ross, JH ;
Chang, CF ;
Yang, HD .
PHYSICAL REVIEW B, 1999, 60 (20) :13941-13945
[4]   Semimetallic behavior in Fe2VAl:: NMR evidence [J].
Lue, CS ;
Ross, JH .
PHYSICAL REVIEW B, 1998, 58 (15) :9763-9766
[5]   GMR in Heusler type alloys Fe2+xV1-xAl [J].
Matsuda, H ;
Endo, K ;
Ooiwa, K ;
Iijima, M ;
Takano, Y ;
Mitamura, H ;
Goto, T ;
Tokiyama, M ;
Arai, J .
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2000, 69 (04) :1004-1007
[6]   Physical properties of Heusler-type Fe2VA1 compound [J].
Matsushita, A ;
Yamada, Y .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1999, 196 :669-670
[7]   Electrical resistivity and specific heat studies of semiconducting states in Fe3-xVxAl [J].
Nishigori, S ;
Yamada, Y ;
Ito, T ;
Abe, H ;
Matsushita, A .
PHYSICA B, 2000, 281 :686-687
[8]   Semiconductorlike behavior of electrical resistivity in Heusler-type Fe2VAl compound [J].
Nishino, Y ;
Kato, M ;
Asano, S ;
Soda, K ;
Hayasaki, M ;
Mizutani, U .
PHYSICAL REVIEW LETTERS, 1997, 79 (10) :1909-1912
[9]   Nuclear magnetic relaxation in Heusler alloys Fe2VGa and Fe2VAl [J].
Ooiwa, K ;
Endo, K .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1998, 177 :1443-1444
[10]   Electronic structure, local moments, and transport in Fe2VAl [J].
Singh, DJ ;
Mazin, II .
PHYSICAL REVIEW B, 1998, 57 (22) :14352-14356