Magnetization Process of the Kondo Insulator YbB12 in Ultrahigh Magnetic Fields
Taku T. Terashima,Akihiko Ikeda,Yasuhiro H. Matsuda,Akihiro Kondo,Koichi Kindo,Fumitoshi Iga +5 more
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TLDR
The magnetization process of the Kondo insulator YbB12 has been revealed in ultrahigh magnetic fields of up to 120 T at 4.2 K in this article.Abstract:
The magnetization process of the Kondo insulator YbB12 has been unveiled in ultrahigh magnetic fields of up to 120 T at 4.2 K. We have found a novel metamagnetic transition at Bc2 = 102 T in addition to the previously known transition at Bc1 = 55 T. It has also been observed that the magnetization tends to saturate at around 112 T. Within the rigid band model, the two-energy-gap structure in the density of states (DOS) explains the successive two-step metamagnetism as a result of the Zeeman effect of the DOS. The metamagnetic transition at Bc1 occurs along with an insulator–metal transition and the field-induced phase is expected to be a heavy fermion metallic state. The Kondo effect can weaken at the second transition of Bc2, as theoretically found in the successive two-metamagnetic-transition process in the Kondo semimetal CeNiSn.read more
Citations
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Quantum oscillations of electrical resistivity in an insulator
Ziji Xiang,Yuichi Kasahara,Tomoya Asaba,Benjamin Lawson,Colin Tinsman,Lu Chen,Kunihisa Sugimoto,Shogo Kawaguchi,Yohei Sato,Gang Li,S. Yao,Yulin Chen,Fumitoshi Iga,John Singleton,Yuji Matsuda,Lu Li +15 more
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Unconventional thermal metallic state of charge-neutral fermions in an insulator
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TL;DR: In this paper, the authors used low-temperature heat-transport measurements to discover gapless, itinerant, charge-neutral excitations in the ground state of YbB12.
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Quantum distance and anomalous Landau levels of flat bands.
TL;DR: It is shown that there is a universal and simple relationship between the total Landau level spread of a flat band and the maximum Hilbert–Schmidt quantum distance, which can be verified in various candidate materials.
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High-speed 100 MHz strain monitor using fiber Bragg grating and optical filter for magnetostriction measurements under ultrahigh magnetic fields
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TL;DR: In this article, a high-speed 100 MHz strain monitor using a fiber Bragg grating, an optical filter, and a mode-locked optical fiber laser has been devised, whose resolution is ΔL/L∼10−4.
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