科研之友
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摘要
An antiferroquadrupolar ordering at T-Q = 0.11 K has been found in a Pr-based superconductor PrIr2Zn20. The measurements of specific heat and magnetization revealed the non-Kramers Gamma(3) doublet ground state with the quadrupolar degrees of freedom. The specific heat exhibits a sharp peak at T-Q = 0.11 K. The increment of T-Q in magnetic fields and the anisotropic B - T phase diagram are consistent with the antiferroquadrupolar ordered state below T-Q. The entropy release at T-Q is only 20% of Rln(2), suggesting that the quadrupolar fluctuations play a role in the formation of the superconducting pairs below T-c = 0.05 K.
- 出版日期2011-4-29
