skip to main content


This content will become publicly available on June 6, 2019

Title: Ferromagnetic quantum critical point in CePd 2 P 2 with Pd Ni substitution

Here, an investigation of the structural, thermodynamic, and electronic transport properties of the isoelectronic chemical substitution series Ce(Pd 1–xNi x) 2P 2 is reported, where a possible ferromagnetic quantum critical point is uncovered in the temperature-concentration ( T–x) phase diagram. This behavior results from the simultaneous contraction of the unit cell volume, which tunes the relative strengths of the Kondo and Ruderman–Kittel–Kasuya–Yosida (RKKY) interactions, and the introduction of disorder through alloying. Near the critical region at x cr ≈ 0.7, the rate of contraction of the unit cell volume strengthens, indicating that the cerium f valence crosses over from trivalent to a noninteger value. Consistent with this picture, x-ray absorption spectroscopy measurements reveal that while CePd 2P 2 has a purely trivalent cerium f state, CeNi 2P 2 has a small (<10 %) tetravalent contribution. In a broad region around x cr, there is a breakdown of Fermi-liquid temperature dependences, signaling the influence of quantum critical fluctuations and disorder effects. Measurements of clean CePd 2P 2 furthermore show that applied pressure has an initial effect similar to alloying on the ferromagnetic order. From these results, CePd 2P 2 emerges as a keystone system to test theories such as the Belitz-Kirkpatrick-Vojtamore » model for ferromagnetic quantum criticality, where distinct behaviors are expected in the dirty and clean limits.« less
 [1] ;  [2] ;  [3] ;  [2] ;  [4] ;  [2] ;  [5] ;  [2] ;  [6] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Florida State Univ., Tallahassee, FL (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Stanford Univ., Stanford, CA (United States)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Washington, Seattle, WA (United States)
  6. Univ. of Washington, Seattle, WA (United States)
Publication Date:
Grant/Contract Number:
DMR-1157490; DMR-1644779; SC0016251; SC0016568; AC02-76SF00515; AC02-05CH11231; P41GM103393
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 22; Journal ID: ISSN 2469-9950
American Physical Society (APS)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
OSTI Identifier: