Antiferroquadrupolar Ordering in a Pr-Based Superconductor PrIr2Zn20

T. Onimaru; K. T. Matsumoto; Y. F. Inoue; K. Umeo; T. Sakakibara; Y. Karaki; M. Kubota; T. Takabatake

doi:10.1103/PhysRevLett.106.177001

← Back to search

Antiferroquadrupolar Ordering in a Pr-Based Superconductor PrIr2Zn20

T. Onimaru, K. T. Matsumoto, Y. F. Inoue, K. Umeo, T. Sakakibara, Y. Karaki, M. Kubota, T. Takabatake

DOI 10.1103/PhysRevLett.106.177001 · Physical Review Letters

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

An antiferroquadrupolar ordering at TQ=0.11 K has been found in a Pr-based superconductor PrIr2Zn20. The measurements of specific heat and magnetization revealed the non-Kramers Γ3 doublet ground state with the quadrupolar degrees of freedom. The specific heat exhibits a sharp peak at TQ=0.11 K. The increment of TQ in magnetic fields and the anisotropic B−T phase diagram are consistent with the antiferroquadrupolar ordered state below TQ. The entropy release at TQ is only 20% of Rln2, suggesting that the quadrupolar fluctuations play a role in the formation of the superconducting pairs below Tc=0.05 K.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
PrIr2Zn20 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.05	Pressure unresolved	onset
LaIr2Zn20 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.6	Pressure not reported	unknown
PrOs4Sb12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.5	Pressure not reported	unknown