Magnetism in CePtPb

Journal Article · Fri Mar 01 04:00:00 EST 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.53.5465· OSTI ID:279087

Movshovich, R; Lawrence, J M; Hundley, M F; Neumeier, J; Thompson, J D ^[1]; Lacerda, A ^[2]; Fisk, Z ^[3]

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1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
2. National High Magnetic Field Laboratory, Los Alamos, New Mexico 87545 (United States)
3. Florida State University, Tallahassee, Florida 32306 (United States)

We report the behavior of the hexagonal compound CePtPb, which has an antiferromagnetic transition at {ital T}{sub {ital N}}=0.9 K. The magnetic susceptibility is highly anisotropic, with the ratio {chi}{sub {ital ab}}/{chi}{sub {ital ac}} extrapolating to the value 65 at {ital T}{sub {ital N}}. The low-temperature magnetization is also anisotropic with {ital M}{sub {ital ab}} saturating to 0.92{mu}{sub {ital B}}/Ce atom at {ital B}=5 T, where {ital M}{sub {ital c}} is five times smaller. The anisotropy is due both to low-symmetry crystal fields and to exchange anisotropy, which causes basal plane ferromagnetic fluctuations to develop below {ital T}{approx_equal}15 K. Three facts suggest that the magnetic order might coexist with heavy-fermion behavior: heat-capacity data show a linear-in-temperature contribution {gamma}{approx_equal}300 mJ/molK{sup 2} in the antiferromagnetic state; the resistivity is quadratic in temperature below {ital T}{sub {ital N}}; and the magnetic entropy is generated very slowly with temperature reaching a value of only 0.7{ital R} ln2 at {ital T}=2{ital T}{sub {ital N}}. On the other hand, the long high-temperature tail of the heat-capacity data correlates with the ferromagnetic fluctuations above {ital T}{sub {ital N}}; and ac susceptibility measurements under hydrostatic pressure (to 17 kbar) show that {ital T}{sub {ital N}} increases with pressure at an approximate rate 20 mK/kbar, which suggests that CePtPb sits in the small J limit of the Doniach phase diagram; hence heavy-fermion effects may be negligible. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 279087
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 9 Vol. 53; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANISOTROPY
ANTIFERROMAGNETISM
CERIUM COMPOUNDS
CRYSTAL FIELD
LEAD COMPOUNDS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MAGNETIC-PHASE TRANSFORMATIONS
MAGNETIZATION
NEEL TEMPERATURE
PHASE DIAGRAMS
PLATINUM COMPOUNDS
SPECIFIC HEAT