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Microscopic investigation of electronic inhomogeneity induced by substitutions in a quantum critical metal CeCoIn$$_5$$

置換子によって誘起された量子臨界金属CeCoIn$$_5$$における電子不均一性に関する微視的研究

酒井 宏典; Ronning, F.*; Zhu, J.-X.*; Wakeham, N.*; 安岡 弘志; 徳永 陽; 神戸 振作; Bauer, E. D.*; Thompson, J. D.*

Sakai, Hironori; Ronning, F.*; Zhu, J.-X.*; Wakeham, N.*; Yasuoka, Hiroshi; Tokunaga, Yo; Kambe, Shinsaku; Bauer, E. D.*; Thompson, J. D.*

核四重極共鳴(NQR)法を用いて、SnやCdを置換した量子臨界金属CeCoIn$$_5$$について微視的研究を行った。その結果、両置換子によって誘起される局所的電子状態は、かなり異なっていることが分かった。この知見は、一般的に置換系で見られる系毎に異なる非フェルミ液体的挙動を統一的に説明することに役立つかも知れない。

Chemical substitutions are used commonly to tune a magnetic transition to zero temperature, but the resulting non-Fermi liquid (NFL) behavior is non-universal. We have used nuclear quadrupole resonance (NQR) to probe microscopically the response of a prototypical quantum-critical metal CeCoIn$$_5$$ to substitutions of small amounts of Sn and Cd for In. These substituents induce very different local electronic environments as observed by site dependent spin lattice relaxation rates $$1/T_1$$ that influence the NFL behavior. The effects found here illustrate the need for care in interpreting NFL properties determined by macroscopic measurements.

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パーセンタイル:44.33

分野:Materials Science, Multidisciplinary

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