Low-temperature NMR study of YbAlB4 (CROSBI ID 609325)
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Podaci o odgovornosti
Grbić, Mihael Srđan ; Kimura, Kentaro ; Takano, Shun ; Tajima, K. ; Yoshida, Makoto ; Takigawa, Masashi ; Kuga, Kentaro ; O’Farrell, Eoin C. T. Nakatsuji, Satoru
engleski
Low-temperature NMR study of YbAlB4
Quantum critical behavior is a perfect playground of condensed matter physics as it can lead to discovery of new phases of matter and better understanding of strongly correlated systems. Two structural isomorphs of YbAlB4 ( and ), show an interesting sensitivity of quantum criticality on local symmetry of B ring which encircles the Yb ion. While at ambient pressure and zero magnetic field -YbAlB4 shows non-Fermi-liquid properties of quantum criticality [1], -YbAlB4 has a Fermi-liquid ground state. We will present most recent results of an NMR study in both compounds, in particular the low temperature behavior of the spin-lattice relaxation rate. While in -YbAlB4 magnetic field suppresses quantum criticality, in -YbAlB4 at finite magnetic field we find a clear change from the Fermi-liquid temperature dependence to a divergent non-Fermi-liquid behavior. Existence of a quantum critical point in both isomorphs is a stringent constraint for possible mechanisms of the Kondo-lattice physics in these compounds. [1] Y. Matsumoto, S. Nakatsuji et al., Science 331, 316 (2011).
valence fluctuation; ytterbium; nmr
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Podaci o prilogu
4-5.
2013.
objavljeno
Podaci o matičnoj publikaciji
Abstracts of Quantum criticality and valence fluctuations in strongly correlated electron systems
Podaci o skupu
Quantum criticality and valence fluctuations in strongly correlated electron systems
predavanje
25.02.2013-26.02.2013
Kashiwa, Japan