| Project/Area Number |
62540228
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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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 | Saitama University |
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Principal Investigator |
MOTOYA Kiyoichiro Faculty of Science, Saitama University Associate Professor, 理学部, 助教授 (60114683)
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| Project Period (FY) |
1987 – 1988
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| Project Status |
Completed (Fiscal Year 1988)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1988: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1987: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Magnetism / Metals / Neutron Scattering / Nuclear Magnetic Resonance / 核磁気共鳴 / 電子相関 |
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| Research Abstract |
Elastic and inelastic neutron scattering measurements have been made on a series of pseudobinary intermetallic compounds Y(Mn_<1-x>Al_x)_2. Long range antiferronagnetic order below T_N - 100K in YMn_2 has been shown to collapse by substitution of only 5% of the manganese atoms by aluminum atoms. In these compounds, a spin glass transition has been clearly indicated by a change in the energy width of the scattered neutron spectrum, as well as by the onset of field hysteresis in susceptibility measurements. In the compound with x = 0.10, the amplitude of spin fluctuations S does not change appreciably with temperature, whereas in YMn_2 it drops by more than 30% at T_N and then increases gradually with increasing temperature. A considerable degree of spatial correlations of spin fluctuations persists up to at least 760K, which is similar to the behavior observed in YMn_2 but quite different from the characteristics of simple localized electron magnets.
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