1990 Fiscal Year Final Research Report Summary
Formation of an Energy Gap in the Valence-Fluctuating System CeNiSn
| Project/Area Number |
01460035
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
固体物性
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| Research Institution | Hiroshima University |
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Principal Investigator |
TAKABATAKE Tosiro Fac. Integr. Arts & Sci., Assoc. Prof., 総合科学部, 助教授 (40171540)
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| Co-Investigator(Kenkyū-buntansha) |
SUZUKI Takasi Fac. Science, Research Assoc., 理学部, 助手 (00192617)
MAENO Yositeru Fac. Science, Assoc. Prof., 理学部, 助教授 (80181600)
SAKURAI Junji Fac. Science, Assoc. Prof., 理学部, 助教授 (30033814)
FUJII Hironobu Fac. Integr. Arts & Sci., Prof., 総合科学部, 教授 (30034573)
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| Project Period (FY) |
1989 – 1990
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| Keywords | Cerium Compound / Kondo Lattice / Valence Fluctuation / Heavy Fermion / Spin Correlation / Specific Heat / Single Crystal / Energy Gap |
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| Research Abstract |
Measurements of susceptibility chi, resistivity rho and thermoelectric power S have been performed on single-crystal CeNiSn. Only along the a axis of the orthorhombic structure, chi (T) and rho (T) do exhibit pronounced peaks at 12 K, whereas no anomaly was found in the specific heat. The gap energies estimated from rho (T) are 2.4, 5.5 and 5.0 K along the a, b and c axes, respectively. Near 3 K, S_a (T) and S_c (T) exhibit extremely sharp peaks indicating the presence of a density of states within the gap. The magnetic contribution to the specific heat divided by temperature, C_m/T, vs T reveals a maximum of 0.19 J/K^2 mol near 6.7 K. These results suggest that an antiferromagnetic correlation develops near 12 K which induces the formation of the pseudo-gap in the narrow band of heavy quasi-particles.
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