특강세미나
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물리학 콜로퀴엄(4월 28일)
과학기술학부 | 2005-04-25 | 조회 1224
본문 내용
□ 제 목 : Self-adaptive Behavior of a Quasi -one-dimensional Organic System
□ 연 사 : 이 인 재 교수(전북대)
□ 일 시 : 2005년 4월 28일(목) 오후 4시
□ 장 소 : 공동실험관 1호관 물리학과 213강의실
□ 내 용 : The Quasi-one-dimensional organic salts (TMTSF)2PF6 is a strongly correlated system, renowned for its remarkably rich physical properties. These properties range from a insulating to a superconducting phase, depending on applied pressure, magnetic field, and temperature. Among the related phenomena are: the quantum Hall effect associated with field induced spin density wave transition, a non-Fermi liquid behavior, an angular-dependent electronic ground state which is coupled with magic angle effect and a possible spin triplet superconductivity. We have studied simultaneous nuclear magnetic resonance and electrical transport in the pressure range near the border of the antiferromagnetic spin density wave (SDW) and the metallic/superconducting phase. Measurements indicate that there exist macroscopic domains of SDW and metallic/superconducting regions with little influence on each other, thereby eliciting strong hysteretic effects in temperature and magnetic field as the volume fraction of the antiferromagnetic insulating phase changes. As pressure is reduced toward a critical pressure, there also present a strong enhancement in the upper critical field (Hc2) and a strong upward curvature in Hc2 vs temperature. The picture which is emerging for the macroscopic coexisting (domain) regime is the near degeneracy of SDW and superconductor and ability to rearrange the interface between the two phases under applied magnetic fields. A simple model based on self-consistently dividing the superconductor into layers will be discussed.
□ 연 사 : 이 인 재 교수(전북대)
□ 일 시 : 2005년 4월 28일(목) 오후 4시
□ 장 소 : 공동실험관 1호관 물리학과 213강의실
□ 내 용 : The Quasi-one-dimensional organic salts (TMTSF)2PF6 is a strongly correlated system, renowned for its remarkably rich physical properties. These properties range from a insulating to a superconducting phase, depending on applied pressure, magnetic field, and temperature. Among the related phenomena are: the quantum Hall effect associated with field induced spin density wave transition, a non-Fermi liquid behavior, an angular-dependent electronic ground state which is coupled with magic angle effect and a possible spin triplet superconductivity. We have studied simultaneous nuclear magnetic resonance and electrical transport in the pressure range near the border of the antiferromagnetic spin density wave (SDW) and the metallic/superconducting phase. Measurements indicate that there exist macroscopic domains of SDW and metallic/superconducting regions with little influence on each other, thereby eliciting strong hysteretic effects in temperature and magnetic field as the volume fraction of the antiferromagnetic insulating phase changes. As pressure is reduced toward a critical pressure, there also present a strong enhancement in the upper critical field (Hc2) and a strong upward curvature in Hc2 vs temperature. The picture which is emerging for the macroscopic coexisting (domain) regime is the near degeneracy of SDW and superconductor and ability to rearrange the interface between the two phases under applied magnetic fields. A simple model based on self-consistently dividing the superconductor into layers will be discussed.
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