Naslov
NMR study of heavy-fermion system α-YbAlB4

Autori
Grbić, Mihael Srđan ; Kimura, Kazuhiro ; Yoshida, Makoto ; Takigawa, Masashi ; Kuga, Kentaro ; Nakatsuji, Satoru

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

Izvornik
Abstracts of the Fall meeting of the Physical Society of Japan / - Tokushima, 2013

Skup
Fall meeting of the Physical Society of Japan

Mjesto i datum
Tokushima, Japan, 25.09.2013. - 28.09.2013

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
criticality; valence transition; heavy fermion; nmr

Sažetak
α-YbAlB4, a heavy fermion compound with Fermi-liquid ground state at zero magnetic field, shows signs of a metamagnetic transition [1] occurring close to H = 3 T. This intriguing fluctuating-valence system is an isomorph of β-YbAlB4 where quantum criticality [2] and low-temperature superconductivity [3] manifest at zero magnetic field. Through NMR on 27Al and 11B nuclei we inspect the nature of the transition in α-YbAlB4, and determine the underlying H-T phase diagram. Magnetic field dependence of the spin-lattice relaxation rate at low temperatures shows a maximum occurring in the vicinity of 2 T and 3.5 T, with a power-law temperature divergence indicating a quantum critical behaviour. We will discuss the observed magnetic field dependence of NMR data in the view of current theoretical models that account for quantum criticality in heavy fermion systems. [1] E.T.C. O’Farrell, K. Kuga, Y. Matsumoto, S. Nakatsuji et al., in preparation [2] Y. Matsumoto, S. Nakatsuji et al., Science 331, 316 (2011). [3] S. Nakatsuji et al., Nat. Phys. 4, 603 (2008).

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA