Collapse of the pseudogap in Kondo semimetal CeNiSn observed by magnetization and magnetoresistance measurements in high magnetic fields up to 65T

被引:2
作者
Yoshii, S [1 ]
Fujita, M
Takamoto, N
Kindo, K
Echizen, Y
Takabatake, T
机构
[1] Osaka Univ, KYOKUGEN, Toyonaka, Osaka 5608531, Japan
[2] Hiroshima Univ, ADSM, Dept Quantum Matter, Hiroshima 7398530, Japan
关键词
CeNiSn; Kondo semimetal; pseudogap; magnetization and magneto resistance; high magnetic field; metamagnetism;
D O I
10.1143/JPSJ.74.2612
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The effect of magnetic field on the pseudogap in the Kondo semimetal CeNiSn has been reinvestigated by the measurement of magnetization and longitudinal magnetoresistance in pulsed high magnetic fields applied along the principal crystallographic directions of the orthorhombic structure. By extending the field range up to 65 T, metamagnetic behaviors at 45 and 60 T are observed for the first time along the easy magnetization direction of a-axis. No anomaly is found, on the other hand, along the b- and c-axes up to 55 T. The magnetoresistance along the a-axis exhibits the minimum at about 30 T and increases above 40 T, which is in accord with the anomalous increase of the magnetization. By contrast, the magnetoresistance along the b- and c-axes shows only a monotonous decrease above 10 T. These results are discussed in terms of a Zeeman splitting of the double-gapped density of states derived from the anisotropic hybridization-gap model.
引用
收藏
页码:2612 / 2616
页数:5
相关论文
共 23 条
[1]   LARGE LOW-TEMPERATURE HALL-EFFECT AND RESISTIVITY IN MIXED-VALENT SMB6 [J].
ALLEN, JW ;
BATLOGG, B ;
WACHTER, P .
PHYSICAL REVIEW B, 1979, 20 (12) :4807-4813
[2]   First studies in the 45 T hybrid magnet at the NHMFL-Tallahassee: the high-field phases of organic and Kondo systems [J].
Brooks, JS ;
Balicas, L ;
Tokumoto, M ;
Terashima, T ;
Echizen, Y ;
Takabatake, T .
PHYSICA B, 2001, 294 :408-412
[3]   INFLUENCE OF CRYSTALLINE FIELD ON KONDO EFFECT OF ALLOYS AND COMPOUNDS WITH CERIUM IMPURITIES [J].
CORNUT, B ;
COQBLIN, B .
PHYSICAL REVIEW B, 1972, 5 (11) :4541-&
[4]   TUNNELING EVIDENCE FOR THE QUASI-PARTICLE GAP IN KONDO SEMICONDUCTORS CENISN AND CERHSB [J].
EKINO, T ;
TAKABATAKE, T ;
TANAKA, H ;
FUJII, H .
PHYSICAL REVIEW LETTERS, 1995, 75 (23) :4262-4265
[5]   HYBRIDIZATION GAP IN CE3BI4PT3 [J].
HUNDLEY, MF ;
CANFIELD, PC ;
THOMPSON, JD ;
FISK, Z ;
LAWRENCE, JM .
PHYSICAL REVIEW B, 1990, 42 (10) :6842-6845
[6]   A theory of anisotropic semiconductor of heavy fermions [J].
Ikeda, H ;
Miyake, K .
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1996, 65 (06) :1769-1781
[7]   Magnetoresistance and the anisotropic hybridization gap in CeNiSn [J].
Inada, Y ;
Azuma, H ;
Settai, R ;
Aoki, D ;
Onuki, Y ;
Kobayashi, K ;
Takabatake, T ;
Nakamoto, G ;
Fujii, H ;
Maezawa, K .
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1996, 65 (05) :1158-1161
[8]   The origin of magnetic field dependence of specific heat in single-crystalline CeNiSn [J].
Izawa, K ;
Suzuki, T ;
Kitamura, M ;
Fujita, T ;
Takabatake, T ;
Nakamoto, G ;
Fujii, H ;
Maezawa, K .
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1996, 65 (10) :3119-3122
[9]   A NEW AND TYPICAL VALENCE FLUCTUATING SYSTEM, YBB12 [J].
KASAYA, M ;
IGA, F ;
NEGISHI, K ;
NAKAI, S ;
KASUYA, T .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1983, 31-4 (FEB) :437-438
[10]   100T magnet developed in Osaka [J].
Kindo, K .
PHYSICA B, 2001, 294 :585-590