Employing the angle-resolved photoemission spectroscopy, we study the electronic structure of TaFe1.23Te3, a two-leg spin ladder compound with a novel antiferromagnetic ground state. Quasi-two-dimensional （2D） Fermi...Employing the angle-resolved photoemission spectroscopy, we study the electronic structure of TaFe1.23Te3, a two-leg spin ladder compound with a novel antiferromagnetic ground state. Quasi-two-dimensional （2D） Fermi surface is observed, with sizable inter-ladder hopping. Moreover, instead of observing an energy gap at the Fermi surface in the antiferromagnetic state, we observe the shifts of various bands. Combining these observations with density-functional-theory calculations, we propose that the large scale reconstruction of the electronic structure, caused by the interactions between the coexisting itinerant electrons and local moments, is most likely the driving force of the magnetic transition. Thus TaFe1.23Te3 serves as a simpler platform that contains similar ingredients to the parent compounds of iron-based superconductors.展开更多
Ectopic pancreas is a relatively common congenital anomaly and is usually asym ptomatic. Pancreatitis in the ectopic site and pseudocyst formation is extremely rare. To date, only 2 cases have been reported. We presen...Ectopic pancreas is a relatively common congenital anomaly and is usually asym ptomatic. Pancreatitis in the ectopic site and pseudocyst formation is extremely rare. To date, only 2 cases have been reported. We present a case of a 3-year-old girl with recurrent pancreatitis and unilateral hydronephrosis of the horseshoe kidney, w hich was produced by pancreatic pseudocyst arising from ectopic pancreas and iso lated intestinal duplication in mesocolon. This is the first case of pancreatic pseudocyst that expanded to the retroperitoneal space and caused urinary tract o bstruction.展开更多
基金Supported by the National Basic Research Program of China under Grant Nos 2012CB921400,2011CB921802 and 2011CBA00112
文摘Employing the angle-resolved photoemission spectroscopy, we study the electronic structure of TaFe1.23Te3, a two-leg spin ladder compound with a novel antiferromagnetic ground state. Quasi-two-dimensional （2D） Fermi surface is observed, with sizable inter-ladder hopping. Moreover, instead of observing an energy gap at the Fermi surface in the antiferromagnetic state, we observe the shifts of various bands. Combining these observations with density-functional-theory calculations, we propose that the large scale reconstruction of the electronic structure, caused by the interactions between the coexisting itinerant electrons and local moments, is most likely the driving force of the magnetic transition. Thus TaFe1.23Te3 serves as a simpler platform that contains similar ingredients to the parent compounds of iron-based superconductors.
文摘Ectopic pancreas is a relatively common congenital anomaly and is usually asym ptomatic. Pancreatitis in the ectopic site and pseudocyst formation is extremely rare. To date, only 2 cases have been reported. We present a case of a 3-year-old girl with recurrent pancreatitis and unilateral hydronephrosis of the horseshoe kidney, w hich was produced by pancreatic pseudocyst arising from ectopic pancreas and iso lated intestinal duplication in mesocolon. This is the first case of pancreatic pseudocyst that expanded to the retroperitoneal space and caused urinary tract o bstruction.
