1998 Fiscal Year Final Research Report Summary
ORDER-PARAMETER SYMMETRY OF HIGH-T_cSUPERCONDUCTORS BY MEANS OF BULK PHYSICAL QUANTITY
| Project/Area Number |
08454100
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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 | Osaka Prefecture University |
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Principal Investigator |
ISHIDA Takekazu College of Engineering, Osaka Prefecture University, Professor, 工学部, 助教授 (00159732)
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| Co-Investigator(Kenkyū-buntansha) |
ASAOKA Hidehito JAERI,Researcher, 材料研究部, 研究員
OKUDA Kiichi College of Engineering, Osaka Prefecture University, Professor, 工学部, 教授 (50028205)
KAWAMATA Shuichi College of Eng., Osaka Prefecture University, Research Associate, 工学部, 助手 (50211868)
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| Project Period (FY) |
1996 – 1998
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| Keywords | torque magnetometer / high-T_C superconductivity / order-parameter symmetry / YBa_2Cu_3O_7 |
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| Research Abstract |
The order parameter symmetry of high-T_0 superconductors has been investigated by means of the bulk physical quantity. This is in contrast with that many experiments were carried out on the basis of surface properties. We built a new torque magnetometer using a split-type 6-T superconducting magnet. The measurement program has been coded using HP-BASIC.The in-plane torque of an untwinned YBa_2Cu_3O_7 single crystal consists of two-fold and four-fold symmetries. The former comes from the mass anisotropy between m_a and m_b. The latter is related with the order parameter symmetry, and is consistent with the existing theories. Our results are not compatible with the d_<xy> symmetry but are in good accordance with the d_<x^2-y^2> symmetry. We consider that our findings are convincing because the magnetic torque reflects information over the whole crystal.
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