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Exotic H−T phase diagram of a-YbAlB4 detected by nuclear magnetic resonance


Grbić, Mihael Srđan; Yoshida, Makoto; Kuga, Kentaro; Nakatsuji, Satoru; Takigawa, Masashi
Exotic H−T phase diagram of a-YbAlB4 detected by nuclear magnetic resonance // Book of abstracts of "The International Conference on Strongly Correlated Electron Systems" / Flouquet, Jacques (ur.).
Grenoble, Francuska, 2014. str. 690-690 (poster, međunarodna recenzija, sažetak, znanstveni)


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Naslov
Exotic H−T phase diagram of a-YbAlB4 detected by nuclear magnetic resonance

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

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

Izvornik
Book of abstracts of "The International Conference on Strongly Correlated Electron Systems" / Flouquet, Jacques - Grenoble, Francuska, 2014, 690-690

Skup
The International Conference on Strongly Correlated Electron Systems

Mjesto i datum
Grenoble, Francuska, 7-11.7.2014

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
critical; heavy fermion; mixed valence magnetic field

Sažetak
Research of mixed-valence compounds has recently been advanced by the discovery of quantum critical (QC) behaviour in β -YbAlB4 where, at low-temperature, a quantum critical point emerges at ambient pressure and zero magnetic field [1]. It has been suggested that here gapless excitations emerge through a line node in the hybridization between 4f and conduction electrons [2], creating a diverging DOS centred at kx, ky = 0 point of the Fermi surface. While at high temperature the sister compound α- YbAlB4 shows equivalent properties to its QC counterpart, its ground state displays all the characteristics of a Fermi liquid. However, nuclear magnetic resonance has found signatures [3] of magnetic-field induced quantum criticality close to 3.8 T, followed by a gradual suppression of the heavy fermion state at higher magnetic fields. We continue to explore the H-T phase diagram of α- YbAlB4 by NMR, and find several other fieldinduced phenomena describing the low-energy properties of this system. We detect a jump in the quadrupolar coupling of 27Al close to 3.8 T indicating a change in the quasistatic electronic environment, and an additional critical behaviour for magnetic field value close to 2.0 T. The diverging nuclear spin-lattice relaxation rate (1/T1 ) show clear power-law temperature dependence down to 70 mK, revealing excitations of a vanishingly small energy scale. We present our findings as well as their possible interpretations in the scope of current theoretical models. [1] S. Nakatsuji et al, Nat. Phys., 4, 603 (2008). [2] A. Ramires, P. Coleman, A. H. Nevidomskyy, A. M. Tsvelik, Phys. Rev. Lett., 109, 176404 (2012). [3] M. S. Grbic, M. Yoshida, K. Kimura, K. Kuga, S. Nakatsuji, M. Takigawa, SCES conference 2013.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Ustanove:
Prirodoslovno-matematički fakultet, Zagreb

Profili:

Avatar Url Mihael Srđan Grbić (autor)


Citiraj ovu publikaciju

Grbić, Mihael Srđan; Yoshida, Makoto; Kuga, Kentaro; Nakatsuji, Satoru; Takigawa, Masashi
Exotic H−T phase diagram of a-YbAlB4 detected by nuclear magnetic resonance // Book of abstracts of "The International Conference on Strongly Correlated Electron Systems" / Flouquet, Jacques (ur.).
Grenoble, Francuska, 2014. str. 690-690 (poster, međunarodna recenzija, sažetak, znanstveni)
Grbić, M., Yoshida, M., Kuga, K., Nakatsuji, S. & Takigawa, M. (2014) Exotic H−T phase diagram of a-YbAlB4 detected by nuclear magnetic resonance. U: Flouquet, J. (ur.)Book of abstracts of "The International Conference on Strongly Correlated Electron Systems".
@article{article, editor = {Flouquet, J.}, year = {2014}, pages = {690-690}, keywords = {critical, heavy fermion, mixed valence magnetic field}, title = {Exotic H−T phase diagram of a-YbAlB4 detected by nuclear magnetic resonance}, keyword = {critical, heavy fermion, mixed valence magnetic field}, publisherplace = {Grenoble, Francuska} }
@article{article, editor = {Flouquet, J.}, year = {2014}, pages = {690-690}, keywords = {critical, heavy fermion, mixed valence magnetic field}, title = {Exotic H−T phase diagram of a-YbAlB4 detected by nuclear magnetic resonance}, keyword = {critical, heavy fermion, mixed valence magnetic field}, publisherplace = {Grenoble, Francuska} }




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