Pressure-temperature phase diagram of the heavy-electron superconductor URu2 Si2

H. Amitsuka, K. Matsuda, I. Kawasaki, K. Tenya, M. Yokoyama, C. Sekine, N. Tateiwa, Tatsuo Kobayashi, S. Kawarazaki, H. Yoshizawa

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Abstract

The pressure-temperature phase diagram of the heavy-electron superconductor URu2 Si2 has been reinvestigated by AC-susceptibility and elastic neutron-scattering (NS) measurements performed on a small single-crystalline rod (2 mm in diameter, 6 mm in length) in a Cu-Be clamp-type high-pressure cell (P <1.1 GPa). At ambient pressure, this sample shows the weakest antiferromagnetic (AF) Bragg reflections reported so far, corresponding to the volume-averaged staggered moment of μo ∼ 0.011 μB / U. Under applied pressure, the AF scattering intensity exhibits a sharp increase at P ∼ 0.7 GPa at low temperatures. The saturation value of the AF scattering intensity above 0.7 GPa corresponds to μo ∼ 0.41 μB / U, which is in good agreement with that (∼ 0.39 μB / U) observed above 1.5 GPa in our previous NS measurements. The superconductivity is dramatically suppressed by the evolution of AF phase, indicating that the superconducting state coexists only with the hidden order phase. The presence of parasitic ferro- and/or antiferromagnetic phases with transition temperatures T1{star, open} = 120 (5), T2{star, open} = 36 (3) and T3{star, open} = 16.5 (5) K and their relationship to the low-T ordered phases are also discussed.

Original languageEnglish
Pages (from-to)214-220
Number of pages7
JournalJournal of Magnetism and Magnetic Materials
Volume310
Issue number2 SUPPL. PART 1
DOIs
Publication statusPublished - Mar 2007

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Superconducting materials
Phase diagrams
phase diagrams
Stars
stars
Electrons
neutron scattering
Neutron scattering
clamps
electrons
Scattering
scattering
Temperature
temperature
Elastic scattering
alternating current
Clamping devices
elastic scattering
rods
superconductivity

Keywords

  • Antiferromagnetism
  • Hidden order
  • Hydrostatic pressure
  • Superconductivity
  • URu Si

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Amitsuka, H., Matsuda, K., Kawasaki, I., Tenya, K., Yokoyama, M., Sekine, C., ... Yoshizawa, H. (2007). Pressure-temperature phase diagram of the heavy-electron superconductor URu2 Si2. Journal of Magnetism and Magnetic Materials, 310(2 SUPPL. PART 1), 214-220. https://doi.org/10.1016/j.jmmm.2006.10.008

Pressure-temperature phase diagram of the heavy-electron superconductor URu2 Si2. / Amitsuka, H.; Matsuda, K.; Kawasaki, I.; Tenya, K.; Yokoyama, M.; Sekine, C.; Tateiwa, N.; Kobayashi, Tatsuo; Kawarazaki, S.; Yoshizawa, H.

In: Journal of Magnetism and Magnetic Materials, Vol. 310, No. 2 SUPPL. PART 1, 03.2007, p. 214-220.

Research output: Contribution to journalArticle

Amitsuka, H, Matsuda, K, Kawasaki, I, Tenya, K, Yokoyama, M, Sekine, C, Tateiwa, N, Kobayashi, T, Kawarazaki, S & Yoshizawa, H 2007, 'Pressure-temperature phase diagram of the heavy-electron superconductor URu2 Si2', Journal of Magnetism and Magnetic Materials, vol. 310, no. 2 SUPPL. PART 1, pp. 214-220. https://doi.org/10.1016/j.jmmm.2006.10.008
Amitsuka H, Matsuda K, Kawasaki I, Tenya K, Yokoyama M, Sekine C et al. Pressure-temperature phase diagram of the heavy-electron superconductor URu2 Si2. Journal of Magnetism and Magnetic Materials. 2007 Mar;310(2 SUPPL. PART 1):214-220. https://doi.org/10.1016/j.jmmm.2006.10.008
Amitsuka, H. ; Matsuda, K. ; Kawasaki, I. ; Tenya, K. ; Yokoyama, M. ; Sekine, C. ; Tateiwa, N. ; Kobayashi, Tatsuo ; Kawarazaki, S. ; Yoshizawa, H. / Pressure-temperature phase diagram of the heavy-electron superconductor URu2 Si2. In: Journal of Magnetism and Magnetic Materials. 2007 ; Vol. 310, No. 2 SUPPL. PART 1. pp. 214-220.
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