Probing Magnetism in the Vortex Phase of PuCoGa5 by X-Ray Magnetic Circular Dichroism

被引：5

作者：

Magnani, N. ^{[1
]}

Eloirdi, R. ^{[1
]}

Wilhelm, F. ^{[2
]}

Colineau, E. ^{[1
]}

Griveau, J. -C. ^{[1
]}

Shick, A. B. ^{[3
]}

Lander, G. H. ^{[1
]}

Rogalev, A. ^{[2
]}

Caciuffo, R. ^{[1
]}

机构：

[1] European Commiss, JRC, Directorate Nucl Safety & Secur, Postfach 2340, D-76125 Karlsruhe, Germany

[2] ESRF, BP 220, F-38043 Grenoble, France

[3] ASCR, Inst Phys, Slovance 2, CZ-18221 Prague, Czech Republic

来源：

PHYSICAL REVIEW LETTERS | 2017年 / 119卷 / 15期

关键词：

SUPERCONDUCTIVITY; SPECTROSCOPY; TEMPERATURE; TRANSITION; SYMMETRY; SPIN;

D O I：

10.1103/PhysRevLett.119.157204

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We measure x-ray magnetic circular dichroism (XMCD) spectra at the Pu M-4,M-5 absorption edges from a newly prepared high-quality single crystal of the heavy-fermion superconductor (PuCoGa5)-Pu-242, exhibiting a critical temperature T-c = 18.7 K. The experiment probes the vortex phase below T-c and shows that an external magnetic field induces a Pu 5f magnetic moment at 2 K equal to the temperature-independent moment measured in the normal phase up to 300 K by a superconducting quantum interference device. This observation is in agreement with theoretical models claiming that the Pu atoms in PuCoGa5 have a nonmagnetic singlet ground state resulting from the hybridization of the conduction electrons with the intermediate-valence 5f electronic shell. Unexpectedly, XMCD spectra show that the orbital component of the 5f magnetic moment increases significantly between 30 and 2 K; the antiparallel spin component increases as well, leaving the total moment practically constant. We suggest that this indicates a low-temperature breakdown of the complete Kondo-like screening of the local 5f moment.

引用

页数：6

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