We perform a variational Monte Carlo study of the nematic state in iron-pnictide superconductors within a realistic five-orbital model. Our numerical results show that the nematic state, formed by introducing an aniso...We perform a variational Monte Carlo study of the nematic state in iron-pnictide superconductors within a realistic five-orbital model. Our numerical results show that the nematic state, formed by introducing an anisotropic hopping order into the projected wave function, is not stable unless the off-site Coulomb interaction V exceeds a critical value. This demonstrates that V plays a key role in forming the nematic state in iron-pnictide superconductors. In the nematic state,the orbital order and the anisotropic spin correlations are consistent with the experimental observations. We argue that the experimentally observed anisotropic magnetic couplings and structural transition are associated with the nematic state and can be understood in a unified framework.展开更多
苍绎铁矿带会宝岭铁矿床为大型隐伏沉积变质岩型铁矿床,矿山涌水量大、排水成本高,且对矿山安全生产构成了威胁。治水前,矿山正常涌水量约530 m 3/h,其中已探明的封闭不良钻孔涌水量163.5 m 3/h,占矿山涌水的重要组成部分。本文针对封...苍绎铁矿带会宝岭铁矿床为大型隐伏沉积变质岩型铁矿床,矿山涌水量大、排水成本高,且对矿山安全生产构成了威胁。治水前,矿山正常涌水量约530 m 3/h,其中已探明的封闭不良钻孔涌水量163.5 m 3/h,占矿山涌水的重要组成部分。本文针对封闭不良钻孔的涌水量、水压、充水水源等特征进行分析,首次在深隐伏铁矿床中提出了孔底点注浆、分段泄压注浆、截水墙注浆止水3种井下注浆止水技术,建立了隐伏铁矿床封闭不良钻孔井下注浆止水体系,并取得了较好的止水效果,对类似矿山的封闭不良钻孔的止水工作具有重要指导意义。展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11274310,11474287,11174072,and 91221103)the Specialized Research Fund for the Doctoral Program of Higher Education of China(Grant No.20104208110001)
文摘We perform a variational Monte Carlo study of the nematic state in iron-pnictide superconductors within a realistic five-orbital model. Our numerical results show that the nematic state, formed by introducing an anisotropic hopping order into the projected wave function, is not stable unless the off-site Coulomb interaction V exceeds a critical value. This demonstrates that V plays a key role in forming the nematic state in iron-pnictide superconductors. In the nematic state,the orbital order and the anisotropic spin correlations are consistent with the experimental observations. We argue that the experimentally observed anisotropic magnetic couplings and structural transition are associated with the nematic state and can be understood in a unified framework.
文摘苍绎铁矿带会宝岭铁矿床为大型隐伏沉积变质岩型铁矿床,矿山涌水量大、排水成本高,且对矿山安全生产构成了威胁。治水前,矿山正常涌水量约530 m 3/h,其中已探明的封闭不良钻孔涌水量163.5 m 3/h,占矿山涌水的重要组成部分。本文针对封闭不良钻孔的涌水量、水压、充水水源等特征进行分析,首次在深隐伏铁矿床中提出了孔底点注浆、分段泄压注浆、截水墙注浆止水3种井下注浆止水技术,建立了隐伏铁矿床封闭不良钻孔井下注浆止水体系,并取得了较好的止水效果,对类似矿山的封闭不良钻孔的止水工作具有重要指导意义。
