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J. Phys. Soc. Jpn. 75S (2006) pp. 14-19  |Previous Article| |Next Article|  |Table of Contents|
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Proc. of 5th Int. Symposium on ASR-WYP-2005 – Advances in the Physics and Chemistry of Actinide Compounds –

µSR Studies of Pu Metal and the Pu-based Superconductor PuCoGa5

Robert H. Heffner1,2, Eric D. Bauer2, B. Chung3, Michael J. Fluss3, Wataru Higemoto1, Takashi U. Ito1,4, Douglas E. MacLaughlin5, Luis A. Morales2, Gerald D. Morris6, Kazuki Ohishi1, John L. Sarrao2 and Lei Shu5

1Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195
2Los Alamos National Laboratory, K764, Los Alamos, New Mexico 87545, U.S.A.
3Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550, U.S.A.
4Department of Physics, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551
5Department of Physics, University of California, Riverside, California 92521, U.S.A.
6TRIUMF, 4004 Wesbrook Mall, Vancouver, B.C., Canada V6T 2A3

We present recent measurements of the magnetic properties of Pu metal and the superconducting properties of PuCoGa5 using the µSR technique. Our measurements set the most stringent upper limits to date on the magnitude of the ordered moments µord in α-Pu and δ-stabilized Pu (alloyed with 4.3 at. % Ga) in zero applied field: µord≤10-3 µB at T\cong4 K. Measurements of the in-plane magnetic-field penetration depth λ(T) in PuCoGa5 (Tc=18.5 K) for 0.06 T applied field (≈2-5 ×Hc1) show that the temperature dependence of the superfluid density, and therefore Δλ(T)=λ(T)-λ(0), are ∝T for T/Tc ≤0.5. We estimate that λ(0)=241(3) nm. We also find no evidence for a time-reversal-symmetry violating superconducting order parameter. Taken together the measurements in PuCoGa5 are, therefore, consistent with an even-parity (pseudo-spin singlet), d-wave pairing state.

URL: http://jpsj.ipap.jp/link?JPSJS/75S/14/
DOI: 10.1143/JPSJS.75S.14


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References

  1. M. S. S. Brooks, H. L. Skriver and B. Johansson: in Handbook on the Physics and Chemistry of the Actinides, ed. A. J. Freeman and G. H. Lander (North-Holland, Amsterdam, 1984).
  2. J. M. Wills et al.: J. Electron Spectrosc. Relat. Phenom. 135 (2004) 163.
  3. J. L. Sarrao et al.: Nature 420 (2002) 297[CrossRef].
  4. F. Wastin, P. Boulet, J. Rebizant, E. Colineau and G. H. Lander: J. Phys.: Condens. Matter 15 (2003) S2279[IoP STACKS].
  5. R. H. Heffner et al. and G. D. Morris et al.: Proc. 10th Int. Conf. Muon Spin Rotation, Relaxation and Resonance, Oxford, U.K., August, 2005.
  6. For a description of the µSR technique, see A. Schenck: Muon Spin Rotation Spectroscopy: Principles and Applications in Solid State Physics (Hilger, Bristol, Boston, 1985).
  7. J. J. Joyce, J. M. Wills, T. Durakiewicz, E. Guziewicz, M. T. Butterfield et al.: Mater. Res. Soc. Symp. Proc. 802 (2004) 239.
  8. See discussion in J. C. Lashley, A. C. Lawson, R. J. McQueeney and G. H. Lander: Phys. Rev. B 71 (2005) 054416[APS].
  9. R. S. Hayano, Y. J. Uemura, J. Imazato, N. Nishida, T. Yamazaki and R. Kubo: Phys. Rev. B 20 (1979) 850[APS].
  10. S. McCall, M. J. Fluss, B. W. Chung, M. McElfresh, D. Jackson and G. Chapline: to be published in Science of Materials, August, 2005.
  11. A. P. Mackenzie and Y. Maeno: Rev. Mod. Phys. 75 (2003) 657[APS].
  12. N. J. Curro et al.: Nature 434 (2005) 622[CrossRef].
  13. H. Sakai et al.: J. Phys. Soc. Jpn. 74 (2005) 1710[JPSJ].
  14. W. Higemoto et al.: J. Phys. Soc. Jpn. 71 (2002) 1023[JPSJ].
  15. E. H. Brandt: Phys. Rev. B 37 (1988) R2349[APS].
  16. K. Ohishi et al.: to be published in Japan Atomic Energy Agency.
  17. M. Tinkham: Introduction to Superconductivity, (McGraw-Hill, New York, 1996) 2nd ed.
  18. T. P. Orlando et al.: Phys. Rev. B 19 (1979) 4545[APS].
  19. Y. J. Uemura, T. Yamazaki, D. R. Harshman, M. Senba and E. J. Ensaldo: Phys. Rev. B 31 (1985) 546[APS].
  20. U. Larson: Phys. Rev. B 18 (1978) 5014[APS].
  21. A. B. Shick, V. Drchal and L. Havela: Europhys. Lett. 69 (2005) 588[CrossRef].
  22. S. Méot-Reymond and J. M. Fournier: J. Alloys Compd. 232 (1996) 119.
  23. S. Y. Savrasov, G. Kotliar and E. Abrahams: Nature 410 (2001) 793[CrossRef].
  24. A. Schenck et al.: Phys. Rev. B 66 (2002) 144404[APS].
  25. Remarkably, preliminary analysis of new experiments on this same sample about one year later show that this linear temperature dependence persists, despite the accumulated radiation damage.
  26. E. I. Blount: Phys. Rev. B 32 (1985) 2935[APS].
  27. D. Einzel et al.: Phys. Rev. Lett. 56 (1986) 2513[APS]; F. Gros et al.: Z. Phys. B 64 (1986) 175[CrossRef].
  28. M. H. S. Amin et al.: Phys. Rev. Lett. 84 (2000) 5864[APS]; M.-R. Li et al.: Phys. Rev. B 61 (2000) 648[APS].
  29. J. E. Sonier et al.: Rev. Mod. Phys. 72 (2000) 769[APS].
  30. R. H. Heffner and M. R. Norman: Comments Condens. Matter Phys. 17 (1996) 361.
  31. T. Moriya: Acta Phys. Pol. B 34 (2003) 287.
  32. P. Monthoux and G. G. Lonzarich: Phys. Rev. B 66 (2003) 224504[APS]; P. Monthoux and G. G. Lonzarich: Phys. Rev. B 63 (2001) 054529[APS]; P. Monthoux and G. G. Lonzarich: Phys. Rev. B 59 (1999) 14598[APS].
  33. K. Tanaka et al.: J. Phys. Soc. Jpn. 73 (2004) 1285[JPSJ]; T. Hotta and K. Ueda: Phys. Rev. B 67 (2003) 104518[APS]; I. Opahle and P. M. Oppeneer: Phys. Rev. Lett. 90 (2003) 157001[APS].
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