Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session T64: Heavy Fermions III
11:30 AM–2:18 PM,
Thursday, March 17, 2022
Room: Hyatt Regency Hotel -Grant Park B
Sponsoring
Unit:
DCMP
Chair: Daniel Silevitch, Caltech
Abstract: T64.00012 : Interplay between multigap superconductivity and multipolar order in PrTi2Al20
1:42 PM–1:54 PM
Presenter:
Akito Sakai
(Department of Physics, University of Tokyo)
Authors:
Akito Sakai
(Department of Physics, University of Tokyo)
Yosuke Matsumoto
(Department of Quantum Materials, Max Planck Institute for Solid State Research, Germany)
Mingxuan Fu
(Univ of Tokyo)
Masaki Tsujimoto
(U. Tokyo)
Eoin O’Farrell
(Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen and Microsoft Quantum Lab Copenhagen, Denmark)
Satoru Nakatsuji
(Department of Physics, University of Tokyo)
A cubic Pr-based rare-earth compound PrTr2Al20 (Tr = Ti, V) possesses a unique crystalline electric field ground state called cubic nonmagnetic Γ3, where only quadrupolar and octupolar degrees of freedom are active [1-3]. Besides, heavy fermion SC is found in the multipole ordered state. Thus, this system provides an ideal platform to study purely multipole-driven physics. Indeed, PrTi2Al20 exhibits a ferroquadrupolar (FQ) order at TQ ∼ 2.0 K, followed by a SC transition at Tc ∼ 0.2 K. Hydrostatic pressure enhances the c-f hybridization strength, resulting in a maximum Tc ~ 1 K and effective mass m* ~110 m0 at ~ 8 GPa which is near the boundary of the FQ order[4].
In this presentation, we will present our recent study for the SC and normal state properties of PrTi2Al20 and Pr1-xLaxTi2Al20 via thermodynamic and transport probes. The Two-gap behavior of SC found in undoped PrTi2Al20 vanishes rapidly with a small amount of La doping, indicating the unconventional nature of the SC.
[1] A. Sakai and S. Nakatsuji, J. Phys. Soc. Jpn., 80, 063701 (2011).
[2] A. Sakai, K. Kuga, and S. Nakatsuji, J. Phys. Soc. Jpn., 81, 083702 (2012).
[3] M. Tsujimoto et al., Phys. Rev. Lett. 113, 267001 (2014).
[4] K. Matsubayashi et al., Phys. Rev. Lett., 109, 187004 (2012).
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