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Title: Chemical pressure tuning of URu 2 Si 2 via isoelectronic substitution of Ru with Fe

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics
 [1];  [2];  [3];  [2];  [4];  [1];  [2];  [2];  [2];  [5];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Univ. of California, San Diego, La Jolla, CA (United States)
  3. The United States Naval Academy, Annapolis, MD (United States); National Institute of Standards and Technology, Gaithersburg, MD (United States)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Florida State Univ., Tallahassee, FL (United States)
  5. National Institute of Standards and Technology, Gaithersburg, MD (United States)

We have used specific heat and neutron diffraction measurements on single crystals of URu2–xFexSi₂ for Fe concentrations x ≤ 0.7 to establish that chemical substitution of Ru with Fe acts as “chemical pressure” Pch as previously proposed by Kanchanavatee et al. [Phys. Rev. B 84, 245122 (2011)] based on bulk measurements on polycrystalline samples. Neutron diffraction reveals a sharp increase of the uranium magnetic moment at x = 0.1, reminiscent of the behavior at the “hidden order” to large moment antiferromagnetic (LMAFM) phase transition observed at a pressure Px ≈ 0.5-0.7 GPa in URu₂Si₂. Using the unit cell volume determined from our measurements and an isothermal compressibility κT = 5.2×10⁻³ GPa⁻¹ for URu₂Si₂, we determine the chemical pressure Pch in URu2-xFexSi₂ as a function of x. The resulting temperature T-chemical pressure Pch phase diagram for URu2-xFexSi₂ is in agreement with the established temperature T-external pressure P phase diagram of URu₂Si₂.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-04ER46105; DMR-0802478; AC52-06NA25396
OSTI ID:
1193437
Alternate ID(s):
OSTI ID: 1179979
Report Number(s):
LA-UR-14-29641; PRBMDO
Journal Information:
Physical Review. B, Condensed Matter and Materials Physics, Vol. 91, Issue 8; ISSN 1098-0121
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 29 works
Citation information provided by
Web of Science

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Cited By (4)

NMR investigation of antiferromagnetism and coherence in URu 2 Si 2 x P x journal January 2017
Single Crystal Growth of URu2Si2 by the Modified Bridgman Technique journal October 2016
Hidden order and beyond: an experimental—theoretical overview of the multifaceted behavior of URu 2 Si 2 journal January 2020
Pressure-induced rotational symmetry breaking in URu2Si2 text January 2018

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