2001 Fiscal Year Final Research Report Summary
Studies of non-fermi liquid behavior in heavy fermion compounds by specific heat measurements under high pressure and magnetic field
| Project/Area Number |
11440109
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
固体物性Ⅱ(磁性・金属・低温)
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| Research Institution | Shimane University |
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Principal Investigator |
NISHIGORI Shijo Instrumental Analysis Center, Shimane University, Assistant Professor, 機器分析センター, 助教授 (50273917)
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| Co-Investigator(Kenkyū-buntansha) |
FUJIWARA Kenji Faculty of Material Science, Shimane Universikty, Assistant Professor, 総合理工学部, 助教授 (50238630)
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| Project Period (FY) |
1999 – 2001
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| Keywords | Ce compounds / non-fermi liquid behavior / specific heat / 2-channel Kondo effect |
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| Research Abstract |
To investigate the non-fermi liquid behavior in Ce heavy fermion systems, electrical resistivity and specific heat of Ce_xL.a_<1-x>Pd_2Al_3 (x = 0〜1.0) with hexagonal structure were measured down to 0.4K. Specific heat was also measured in magnetic fields up to 5T between 0.5 and 4.2K. The main results of this work are ;
1. Magnetic specific heat divided by temperature, C_m/T, shows a non-fermi liquid behavior ( -InTdependence) in the wide Ce concentration range below x = 0.7, at which the antiferro-magnetic transition disappears.
2. For x ≦ 0.15, the logarithmic divergence in C_m/T is suppressed by application of the magnetic fields indicating a recovery of the fermi-liquid states. Magnetic entropy calculated by integrating C_m/T with T is not enhanced in magnetic fields suggesting that the non-fermi liquid behavior could not arise from 2-channel Kondo effect.
3. C_m/T exhibit surprisingly identical temperature dependence in the wide Ce concentration range between x = 0.3 and 0.7. Such concentration dependence characteristic of Ce_xLa_<1-x>Pd_2Al_3 has not been found in other systems.
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