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Pressure-induced Metal-insulator Transition of the Mott Insulator Ba2IrO4
Daisuke Orii,Masafumi Sakata,Atsushi Miyake,Katsuya Shimizu,Hirotaka Okabe,Masaaki Isobe,Eiji Takayama-Muromachi,Jun Akimitsu 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
The electrical resistivity of single crystals of the spin-orbit Mott insulator Ba2IrO4 has beenmeasured at pressures up to 30 GPa and at temperatures from 100 mK to 300 K. Ba2IrO4 showsa metal-insulator transition at around Pc = 24 GPa, though it does not show superconductivitydown to 100 mK. The low-temperature resistivity in the metallic state does not obey a conventionalFermi-liquid description. This suggests that carriers are incoherently scattered by antiferromagneticquantum spin fluctuations. The critical exponent for the metal-insulator transition is about 1.6,indicating that Ba2IrO4 is located near the boundary between a Mott and an Anderson insulator. This means that even in a single crystal, the effect of crystallographic disorder should not be ignored.
Clinical and MRI Characteristics of Uterine Cervical Adenocarcinoma: Its Variants and Mimics
Tsukasa Saida,Akiko Sakata,Yumiko Oishi Tanaka,Hiroyuki Ochi,Toshitaka Ishiguro,Masafumi Sakai,Hiroaki Takahashi,Toyomi Satoh,Manabu Minami 대한영상의학회 2019 Korean Journal of Radiology Vol.20 No.3
Adenocarcinoma currently accounts for 10–25% of all uterine cervical carcinomas and has a variety of histopathological subtypes. Among them, mucinous carcinoma gastric type is not associated with high-risk human papillomavirus (HPV) infection and a poor prognosis, while villoglandular carcinoma has an association with high-risk HPV infection and a good prognosis. They show relatively characteristic imaging findings which can be suggested by magnetic resonance imaging (MRI), though the former is sometimes difficult to be distinguished from lobular endocervical glandular hyperplasia. Various kinds of other tumors including squamous cell carcinoma should be also differentiated on MRI, while it is currently difficult to distinguish them on MRI, and HPV screening and pathological confirmation are usually necessary for definite diagnosis and further patient management.