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High-temperature antiferromagnetism in Yb based heavy fermion systems proximate to a Kondo insulator

Shintaro Suzuki1,*, Kou Takubo1,*, Kentaro Kuga2, Wataru Higemoto3,4, Takashi U. Ito3, Takahiro Tomita1, Yasuyuki Shimura5, Yosuke Matsumoto6, Cédric Bareille1 et al.

Hiroki Wadati1, Shik Shin1, and Satoru Nakatsuji1,7,8,9,10,†

  • 1Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, Chiba 277-8581, Japan
  • 2RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
  • 3Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
  • 4Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8550, Japan
  • 5Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi Hiroshima 739-8530, Japan
  • 6Max Planck Institute for Solid State Research, Heisenbergstrasse 1, Stuttgart 70569, Germany
  • 7Department of Physics, Graduate School of Science, University of Tokyo, Tokyo 113-0033, Japan
  • 8CREST, Japan Science and Technology Agency (JST), 4-1-8 Honcho Kawaguchi, Saitama 332-0012, Japan
  • 9Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
  • 10Trans-scale Quantum Science Institute, University of Tokyo, Tokyo 113-0033, Japan
  • *These authors contributed equally to this work.
  • †To whom correspondence should be addressed: satoru@phys.s.u-tokyo.ac.jp
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Phys. Rev. Research 3, 023140 – Published 24 May, 2021

DOI: https://doi.org/10.1103/PhysRevResearch.3.023140

Abstract

Given the parallelism between the physical properties of Ce- and Yb-based magnets and heavy fermions due to the electron-hole symmetry, it has been rather odd that the transition temperature of the Yb-based compounds is normally very small, as low as ∼1K or even lower, whereas Ce counterparts may often have the transition temperature well exceeding 10 K. Here, we report our experimental discovery of the transition temperature reaching 20 K in a Yb-based compound at ambient pressure. The Mn substitution at the Al site in an intermediate valence state of α−YbAlB4 not only induces antiferromagnetic transition at a record high temperature of 20 K but also transforms the heavy-fermion liquid state in α−YbAlB4 into a highly resistive metallic state proximate to a Kondo insulator.

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Article Text

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Phys. Rev. Research 3, 023140– Published 24 May, 2021
  • Received 25 March 2018
  • Accepted 25 March 2021
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