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Low-temperature properties of pseudoternary R(Rh1−x Ir x )4B4 (R=Ho and Dy) systems

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Abstract

Pseudoternary Ho(Rh1−x Irx)4B4 and Dy(Rh1−x Irx)4B4 systems were investigated with respect to the interplay between superconductivity (SC) and long-range magnetic ordering by means of specific heat (C) and upper critical magnetic field (H c2) measurements. For Ho(Rh1−x Irx)4B4 withx≲0.2 and Dy(Rh1−x Irx)4B4 withx≲0.15, ferromagnetic (FM) ordering, reminiscent of spin-1/2 mean-field theory, was observed. In particular, FM ordering in Ho(Rh1−x Irx)4B4 with 0.07≲x≲0.2 was found to destroy SC at a second critical temperatureT c2 below the superconducting transition temperatureT c, and was accompanied by a spike-shaped feature inC atT c2. Coexistence of antiferromagnetic (AFM) ordering with SC was observed in both systems for 0.2≲x≲0.7. The compounds withx≲0.5 exhibited Néel temperaturesT N that were smaller thanT c and enhanced values ofH c2 belowT N. TheT c andT N undergo an abrupt decrease and increase, respectively, nearx≈0.5, and then cross atx≈0.6, above whichT N>T c. For Ho(Rh1−x Irx)4B4 with 0.275≤x≤0.4, two different AFM transitions were detected in a double-peak feature inC.

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Author notes

  1. S. E. Lambert

    Present address: IBM Almaden Research Center, San Jose, California

Authors and Affiliations

  1. Department of Physics and Institute for Pure and Applied Physical Sciences, University of California at San Diego, La Jolla, California

    K. N. Yang, S. E. Lambert & M. B. Maple

  2. Department of Physics, National Tsing-Hua University, Hsinchu, Taiwan

    H. C. Ku

Authors
  1. K. N. Yang
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  2. S. E. Lambert
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  3. M. B. Maple
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  4. H. C. Ku
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Yang, K.N., Lambert, S.E., Maple, M.B. et al. Low-temperature properties of pseudoternary R(Rh1−x Ir x )4B4 (R=Ho and Dy) systems. J Low Temp Phys 70, 191–216 (1988). https://doi.org/10.1007/BF00683252

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