Suppression of time-reversal symmetry breaking superconductivity in Pr(Os${}_{1\ensuremath{-}x}$Ru${}_{x}$)${}_{4}$Sb${}_{12}$ and Pr${}_{1\ensuremath{-}y}$La${}_{y}$Os${}_{4}$Sb${}_{12}$

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Suppression of time-reversal symmetry breaking superconductivity in Pr(Os $_{1 - x}$ Ru $_{x}$ ) $_{4}$ Sb $_{12}$ and Pr $_{1 - y}$ La $_{y}$ Os $_{4}$ Sb $_{12}$

Lei Shu, W. Higemoto, Y. Aoki, A. D. Hillier, K. Ohishi, K. Ishida, R. Kadono, A. Koda, O. O. Bernal, D. E. MacLaughlin, Y. Tunashima, Y. Yonezawa, S. Sanada, D. Kikuchi, H. Sato, H. Sugawara, T. U. Ito, and M. B. Maple

Phys. Rev. B 83, 100504(R) – Published 9 March 2011

Abstract

Zero-field muon spin relaxation experiments have been carried out in the Pr(Os $_{1 - x}$ Ru $_{x}$ ) $_{4}$ Sb $_{12}$ and Pr $_{1 - y}$ La $_{y}$ Os $_{4}$ Sb $_{12}$ alloy systems to investigate broken time-reversal symmetry (TRS) in the superconducting state, signaled by the onset of a spontaneous static local magnetic field $B_{s}$ . In both alloy series $B_{s}$ initially decreases linearly with solute concentration. Ru doping is considerably more efficient than La doping, with a $~$ 50% faster initial decrease. The data suggest that broken TRS is suppressed for Ru concentration $x ≳ 0.6$ but persists for essentially all La concentrations. Our data support a crystal-field excitonic Cooper pairing mechanism for TRS-breaking superconductivity.

Received 4 February 2011

DOI:https://doi.org/10.1103/PhysRevB.83.100504

Authors & Affiliations

Lei Shu^1,*, W. Higemoto², Y. Aoki³, A. D. Hillier⁴, K. Ohishi^2,†, K. Ishida⁵, R. Kadono⁶, A. Koda⁶, O. O. Bernal⁷, D. E. MacLaughlin⁸, Y. Tunashima³, Y. Yonezawa³, S. Sanada³, D. Kikuchi³, H. Sato³, H. Sugawara^9,‡, T. U. Ito², and M. B. Maple¹⁰

¹Department of Physics and Astronomy, University of California, Riverside, California 92521, USA
²Japan Atomic Energy Agency, Tokai-Mura, Ibaraki 319-1195, Japan
³Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan
⁴ISIS facility, STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Oxfordshire, OX11 0QX, United Kingdom
⁵Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
⁶Meson Science Laboratory, KEK, Tsukuba, Ibaraki 305-0801, Japan
⁷Department of Physics and Astronomy, California State University, Los Angeles, California 90032, USA
⁸Department of Physics, University of California, Riverside, California 92521, USA
⁹Faculty of the Integrated Arts and Sciences, The University of Tokushima, Tokushima 770-8502, Japan
¹⁰Department of Physics, University of California, San Diego, La Jolla, California 92093, USA

^*Present address: Department of Physics, University of California, San Diego, La Jolla, California 92093.
^†Present address: Advanced Meson Science Laboratory, Nishina Center for Accelerator-Based Science, RIKEN, Wako 351-0198, Japan.
^‡Present address: Department of Physics, Kobe University, Kobe 657-8501, Japan.

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Vol. 83, Iss. 10 — 1 March 2011

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Physical Review B

covering condensed matter and materials physics

Suppression of time-reversal symmetry breaking superconductivity in Pr(Os $_{1 - x}$ Ru $_{x}$ ) $_{4}$ Sb $_{12}$ and Pr $_{1 - y}$ La $_{y}$ Os $_{4}$ Sb $_{12}$

Lei Shu, W. Higemoto, Y. Aoki, A. D. Hillier, K. Ohishi, K. Ishida, R. Kadono, A. Koda, O. O. Bernal, D. E. MacLaughlin, Y. Tunashima, Y. Yonezawa, S. Sanada, D. Kikuchi, H. Sato, H. Sugawara, T. U. Ito, and M. B. Maple

Phys. Rev. B 83, 100504(R) – Published 9 March 2011

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Physical Review B

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Suppression of time-reversal symmetry breaking superconductivity in Pr(Os1−xRux)4Sb12 and Pr1−yLayOs4Sb12

Lei Shu, W. Higemoto, Y. Aoki, A. D. Hillier, K. Ohishi, K. Ishida, R. Kadono, A. Koda, O. O. Bernal, D. E. MacLaughlin, Y. Tunashima, Y. Yonezawa, S. Sanada, D. Kikuchi, H. Sato, H. Sugawara, T. U. Ito, and M. B. Maple

Phys. Rev. B 83, 100504(R) – Published 9 March 2011

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Suppression of time-reversal symmetry breaking superconductivity in Pr(Os $_{1 - x}$ Ru $_{x}$ ) $_{4}$ Sb $_{12}$ and Pr $_{1 - y}$ La $_{y}$ Os $_{4}$ Sb $_{12}$