重い電子の2次元閉じこめ(最近の研究から)  [in Japanese] Two-Dimensional Confinement of Heavy Fermions(Current Topics)  [in Japanese]

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Abstract

ある種の希土類化合物では伝導電子の有効質量が自由電子の数百倍にもに達する「重い電子」による金属状態が形成され,今まで知られている金属の中で最も強い電子相関を持った状態が実現される.これまでの重い電子系化合物はすべて3次元的な電子構造を持っていた.最近我々は分子線エピタキシー法により希土類化合物の人工超格子薄膜を作製し,重い電子系の次元性を3次元から2次元に制御することに成功した.2次元空間の重い電子系(2次元近藤格子)は通常の金属が示すフェルミ液体的振る舞いから大きくはずれた振る舞いを示す.

Metallic systems with the strongest electron correlations are realized in certain rare-earth and actinide compounds whose physics are dominated by f-electrons. These materials are known as heavy fermions, so called because the effective mass of the conduction electrons is enhanced via correlation effects up to as much as several hundreds times the free electron mass. To date the electronic structure of all heavy-fermion compounds is essentially three-dimensional. Here we report on the first realization of a two-dimensional heavy-fermion system, where the dimensionality is adjusted in a controllable fashion by fabricating heterostructures using molecular beam epitaxy. The two-dimensional heavy fermion system displays striking deviations from the standard Fermi liquid low-temperature electronic properties.

Journal

  • Butsuri

    Butsuri 65(11), 877-881, 2010

    The Physical Society of Japan

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Codes

  • NII Article ID (NAID)
    110007880800
  • NII NACSIS-CAT ID (NCID)
    AN00196952
  • Text Lang
    JPN
  • Article Type
    REV
  • ISSN
    0029-0181
  • NDL Article ID
    10869446
  • NDL Source Classification
    ZM35(科学技術--物理学)
  • NDL Call No.
    Z15-13
  • Data Source
    CJP  NDL  NII-ELS  J-STAGE 
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