Ferromagnetic quantum critical point in UCo${}_{1\ensuremath{-}x}$Fe${}_{x}$Ge

Ferromagnetic quantum critical point in UCo $_{1 - x}$ Fe $_{x}$ Ge

K. Huang, J. J. Hamlin, R. E. Baumbach, M. Janoschek, N. Kanchanavatee, D. A. Zocco, F. Ronning, and M. B. Maple

Phys. Rev. B 87, 054513 – Published 26 February 2013

Abstract

We have carried out a comprehensive study of the UCo $_{1 - x}$ Fe $_{x}$ Ge series across the entire range of compositions $0 \leq x \leq 1$ , and report the results of x-ray diffraction, magnetization, specific heat, and electrical resistivity measurements to uncover the $T$ - $x$ phase diagram. Substitution of Fe into UCoGe initially results in an increase in the Curie temperature and a rapid destruction of the superconductivity. Near $x = 0.22$ , the ferromagnetic transition is suppressed to zero temperature at an apparent ferromagnetic itinerant electron quantum critical point, where the temperature dependence of the electrical resistivity and specific heat in this region reveal non-Fermi liquid behavior.

Received 2 December 2010

DOI:https://doi.org/10.1103/PhysRevB.87.054513

Authors & Affiliations

K. Huang¹, J. J. Hamlin¹, R. E. Baumbach^1,*, M. Janoschek^1,*, N. Kanchanavatee¹, D. A. Zocco¹, F. Ronning², and M. B. Maple^1,†

¹Department of Physics, University of California, San Diego, La Jolla, California 92093, USA
²MPA-CMMS Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

^*Present address: Condensed Matter and Magnet Science group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545.
^†Corresponding author: mbmaple@ucsd.edu

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Vol. 87, Iss. 5 — 1 February 2013

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Physical Review B

covering condensed matter and materials physics

Ferromagnetic quantum critical point in UCo $_{1 - x}$ Fe $_{x}$ Ge

K. Huang, J. J. Hamlin, R. E. Baumbach, M. Janoschek, N. Kanchanavatee, D. A. Zocco, F. Ronning, and M. B. Maple

Phys. Rev. B 87, 054513 – Published 26 February 2013

Abstract

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Physical Review B

covering condensed matter and materials physics

Ferromagnetic quantum critical point in UCo1−xFexGe

K. Huang, J. J. Hamlin, R. E. Baumbach, M. Janoschek, N. Kanchanavatee, D. A. Zocco, F. Ronning, and M. B. Maple

Phys. Rev. B 87, 054513 – Published 26 February 2013

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Ferromagnetic quantum critical point in UCo $_{1 - x}$ Fe $_{x}$ Ge