Ferromagnetic quantum critical point in CePd2P2 with Pd → Ni substitution

Lai, Y.; Bone, S. E.; Minasian, S.; Ferrier, M. G.; Lezama-Pacheco, J.; Mocko, V.; Ditter, A. S.; Kozimor, S. A.; Seidler, G. T.; Nelson, W. L.; Chiu, Y. -C.; Huang, K.; Potter, W.; Graf, D.; Albrecht-Schmitt, T. E.; Baumbach, R. E.

doi:10.1103/physrevb.97.224406

Ferromagnetic quantum critical point in ${CePd}_{2} P_{2}$ with Pd $\to$ Ni substitution

Journal Article · Wed Jun 06 00:00:00 EDT 2018 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.97.224406· OSTI ID:1458410

Lai, Y. ^[1]; Bone, S. E. ^[2]; Minasian, S. ^[3]; Ferrier, M. G. ^[2]; Lezama-Pacheco, J. ^[4]; Mocko, V. ^[2]; Ditter, A. S. ^[5]; Kozimor, S. A. ^[2]; Seidler, G. T. ^[6]; Nelson, W. L. ^[1]; Chiu, Y. -C. ^[1]; Huang, K. ^[1]; Potter, W. ^[1]; Graf, D. ^[1]; Albrecht-Schmitt, T. E. ^[1]; Baumbach, R. E. ^[1]

Florida State Univ., Tallahassee, FL (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Stanford Univ., Stanford, CA (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Washington, Seattle, WA (United States)
Univ. of Washington, Seattle, WA (United States)

Here, an investigation of the structural, thermodynamic, and electronic transport properties of the isoelectronic chemical substitution series Ce(Pd_1–xNi_x)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 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 CePd₂P₂ has a purely trivalent cerium f state, CeNi₂P₂ 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 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.

View Accepted Manuscript (DOE)

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Actinide Science & Technology (CAST); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Los Alamos National Laboratory (LANL); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231; AC02-76SF00515; AC52-06NA25396; SC0016251; SC0016568

OSTI ID:: 1458410

Alternate ID(s):: OSTI ID: 1505520
OSTI ID: 1440800
OSTI ID: 1463554

Report Number(s):: LA-UR-18-20284

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 22 Vol. 97; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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