Abstract
Kondo temperature TK’s for Kondo insulator alloys Yb1-xRxB12 (R = Y, Lu, Sc and Zr) show drastic variation as every x increase. It is found that YbB12 in a virtual gap-less state would have a peak at about 25 K in magnetic susceptibility χ(T) from analysis of χ(T) of all these alloys. Up-turns shown in χ(T) below 20 K grow as development of an energy gap ΔE. Those behaviors may be related to the second-gap development within the in-gap state showing metallic behaviors.
Highlights
YbB12 is well known as a typical Kondo insulator such as SmB6.1 Kondo temperature T K is about 200 K, showing similar physical properties seen in SmB6 called as the topological Kondo insulator.[2,3,4]
More detailed mechanism for energy gap formation in YbB12 is still necessary to discuss in order to explain such behaviors
We call the arrows position in temperature as the maximum peak temperature T χMax. These characteristic temperatures T χMax should be thought as a measure of Kondo temperature T K in usual Kondo metallic alloy system
Summary
YbB12 is well known as a typical Kondo insulator such as SmB6.1 Kondo temperature T K is about 200 K, showing similar physical properties seen in SmB6 called as the topological Kondo insulator.[2,3,4] Magnitude of the energy gap ∆E evaluated from specific heat, electrical transport, optical and photoemission spectra in YbB12 is almost same as kBT K, where kB is the Boltzmann factor. Non-magnetic element substitution effect in Kondo insulator YbB12 and exotic surface effect in this alloy system Magnetization process of YbB12 in high fields at low temperatures shows two magnetic transitions anisotropically at around 50 T and 100 T.8 These may be originated from two-step energy gap structure of the density of states at around Fermi energy εF.
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