1994 Fiscal Year Final Research Report Summary
Experimental Study of New Universality Classes in Magnetic Phase Transition
| Project/Area Number |
05640409
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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Ⅱ(磁性・金属・低温)
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| Research Institution | FUKUI UNIVERSITY |
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Principal Investigator |
AJIRO Yoshitami FUKUI UNIVERSITY,APPLIED PHYSICS,ASSOCIATE PROFESSOR, 工学部, 助教授 (00025438)
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| Project Period (FY) |
1993 – 1994
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| Keywords | Phase transition / Universality / Phase diagram / Triangular lattice / One-dimensional magnet / Quantum spin |
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| Research Abstract |
The purpose of the present research is to elucidate the phase transitions in low dimensional magnetic system, such as frustrated triangular lattice antiferromagnet and quantum spin one-dimensional antiferromagnet.We performed the experimental study on various model substances using nuclear magnetic resonance (NMR), electron spin resonance (ESR), neutron scattering, susceptibity and high field magnetization maeasuments.
1.Triangular lattice antiferromagnet
Our precise measurements between 1.4K and 300K under static magnetic fields up to 40 T,occasionally up to 110 T,revealed a rich variety of magnetic phase transitions in the stacked triangular lattice antiferromagnets ABX3 and AMO2, including a novel phase transition which belongs to a new universality class linked to chiral degeneracy.The magnetic field versus temoerature phase diagrams are classified into two types depending on their magnetic antisotropies.
2.Quantum spin system
Nonmagnetic groud states due to quantum spin effect were studied for one-dimensional Heisenberg systems.We observed remarkable differneces in the nonmagnetic impurity efect on the Haldane system, spin-Peierls system and alternating linear chain system and disscussed the physical sihnificance of the results.
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[Publications] Y.J.Uemura, A.Keren, K.Kojima, L.P.Le, G.M.Luke, W.D.Wu, Y.Ajiro, T.Asano, Y.Kuriyama, M.Mekata, K.Kakurai, K.Kikuchi: "Spin Fluctuations in Frustrated Kagome Lattice System SrCr8Ga4019 Studied by Muon Spin Relaxation" Phys.Rev.Lett.73. 3306-3309 (1994)
Description
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