Naslov
Low-temperature NMR study of YbAlB4

Autori
Grbić, Mihael Srđan ; Kimura, Kentaro ; Takano, Shun ; Tajima, K. ; Yoshida, Makoto ; Takigawa, Masashi ; Kuga, Kentaro ; O’Farrell, Eoin C. T. Nakatsuji, Satoru

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Abstracts of Quantum criticality and valence fluctuations in strongly correlated electron systems / - , 2013, 4-5

Skup
Quantum criticality and valence fluctuations in strongly correlated electron systems

Mjesto i datum
Kashiwa, Japan, 25.02.2013. - 26.02.2013

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
valence fluctuation; ytterbium; nmr

Sažetak
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).

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA