Abstract
YbB12 has been investigated energetically as a typical Kondo insulator. To study detailed formation mechanism of Kondo energy gap, we have investigated transport and magnetic properties of Yb1-xR3+xB12 (R3+ = non-magnetic trivalent ions). Recently, we have recently succeeded in substitution of Ca2+ for Yb site in YbB12 by high-pressure synthesis. In Ca- and Lu-substituted alloys both of magnetic susceptibility and specific heat C/T at low temperatures, remarkably show larger increase than those of powdered YbB12. These increases are due to giant increase of density of state in an in-gap state.
Highlights
YbB12 has been studied as a mixed-valent[1] or Kondo-Insulator[2] which has a multi-step gap formation at low temperatures
At lower temperatures (T < 15 K), second gap ∆E2 of 100 K opens with a smaller residual DOS
Yb1-xCaxB12 polycrystal sample were prepared by high-pressure synthesis using the Mavo-press instrument
Summary
YbB12 has been studied as a mixed-valent[1] or Kondo-Insulator[2] which has a multi-step gap formation at low temperatures. Divalent ion substitution effect on Yb-site in Kondo insulator YbB12 & Eng., Ibaraki University, Mito 310-8512, Japan 2College of Sci., Ibaraki University, Mito 310-8512, Japan 3ISSP, Univ. Of Tokyo, Kashiwa 277-8581, Japan (Received 5 June 2018; accepted 24 September 2018; published online 12 October 2018)
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