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

Journal Article · · Physical Review B
 [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)

An investigation of the structural, thermodynamic, and electronic transport properties of the isoelectronic chemical substitution series Ce(Pd1-xNix)2P2 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 xcr ≈ 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 CePd2P2 has a purely trivalent cerium f state, CeNi2P2 has a small (<10 %) tetravalent contribution. In a broad region around xcr, there is a breakdown of Fermi-liquid temperature dependences, signaling the influence of quantum critical fluctuations and disorder effects. Measurements of clean CePd2P2 furthermore show that applied pressure has an initial effect similar to alloying on the ferromagnetic order. From these results, CePd2P2 emerges as a keystone system to test theories such as the Belitz-Kirkpatrick-Vojta model for ferromagnetic quantum criticality, where distinct behaviors are expected in the dirty and clean limits.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Actinide Science & Technology (CAST); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
DMR-1157490; DMR-1644779; SC0016251; SC0016568; AC02-76SF00515; AC02-05CH11231; P41GM103393; AC52-06NA25396
OSTI ID:
1458410
Alternate ID(s):
OSTI ID: 1440800; OSTI ID: 1463554; OSTI ID: 1505520
Report Number(s):
LA-UR-18-20284; PRBMDO; TRN: US1901417
Journal Information:
Physical Review B, Vol. 97, Issue 22; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 10 works
Citation information provided by
Web of Science

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Figures / Tables (8)