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Oral presentation

Microscopic aspects of electronic inhomogeneity and anisotropic spin fluctuations near antiferromagnetic quantum critical point

Sakai, Hironori

no journal, , 

Quantum criticalities tuned by pressure, external field, and chemical substitutions mark an important link in the heavy fermion superconductors. Systematic NMR investigations have suggested that $$XY$$-type antiferromagnetic spin fluctuations are favorable for $$d$$-wave superconductivity in 115 compounds. Recently, anisotropy of antiferromagnetic spin fluctuations is now being microscopically examined in several other tetragonal systems like CeRh$$_2$$Si$$_2$$ under pressures. Moreover, electrical inhomogeneity near quantum critical point is also detected in the chemically substituted CeCoIn$$_5$$.

Oral presentation

Local moments in the heterogeneous electronic state of Cd or Zn-substituted CeCoIn$$_5$$; Around Kondo holes

Sakai, Hironori; Hattori, Taisuke; Tokunaga, Yo; Kambe, Shinsaku; Yokoyama, Makoto*; Zhu, J.-X.*; Ronning, F.*; Bauer, E. D.*; Thompson, J. D.*

no journal, , 

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 Cd or Zn for In. Such non-magnetic Cd or Zn substitutions induce a long range antiferromagnetism. In the case of the Cd substitutions, approximately half of the Cd substituents induce local Ce moments in their close proximity, as observed by site-dependent longitudinal nuclear spin relaxation rates $$1/T_1$$. In the case of Zn substitutions, the similar site dependence of $$1/T_1$$ is observed as well. We will discuss about the heterogeneous electronic state realized in such a dilutely substituted system.

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