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Title: Thermal conductivity of layered borides: The effect of building defects on the thermal conductivity of TmAlB{sub 4} and the anisotropic thermal conductivity of AlB{sub 2}

Rare earth metal borides have attracted great interest due to their unusual properties, such as superconductivity and f-electron magnetism. A recent discovery attributes the tunability of magnetism in rare earth aluminoborides to the effect of so-called “building defects.” In this paper, we report data for the effect of building defects on the thermal conductivities of α-TmAlB{sub 4} single crystals. Building defects reduce the thermal conductivity of α-TmAlB{sub 4} by ≈30%. At room temperature, the thermal conductivity of AlB{sub 2} is nearly a factor of 5 higher than that of α-TmAlB{sub 4}. AlB{sub 2} single crystals are thermally anisotropic with the c-axis thermal conductivity nearly twice the thermal conductivity of the a-b plane. Temperature dependence of the thermal conductivity near and above room temperature reveals that both electrons and phonons contribute substantially to thermal transport in AlB{sub 2} with electrons being the dominant heat carriers.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ; ;  [3] ; ;  [5] ;  [6] ;  [7] ;  [1]
  1. Department of Materials Science and Engineering and Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801 (United States)
  2. (United States)
  3. International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba 305-0044 (Japan)
  4. (Japan)
  5. Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577 (Japan)
  6. Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, 01187 Dresden (Germany)
  7. Faculty of Science and Engineering, Kokushikan University, 4-28-1 Setagaya, Tokyo 154-8515 (Japan)
Publication Date:
OSTI Identifier:
22269209
Resource Type:
Journal Article
Resource Relation:
Journal Name: APL Materials; Journal Volume: 2; Journal Issue: 4; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM BORIDES; ANISOTROPY; DEFECTS; ELECTRONS; MAGNETISM; MONOCRYSTALS; RARE EARTHS; TEMPERATURE DEPENDENCE; THERMAL CONDUCTIVITY