Magnetic phase diagram of the ferromagnetic Kondo-lattice compound <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">CeAgSb</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span> up to 80 kbar

V. A. Sidorov; E. D. Bauer; N. A. Frederick; J. R. Jeffries; S. Nakatsuji; N. O. Moreno; J. D. Thompson; M. B. Maple; Z. Fisk

doi:10.1103/PhysRevB.67.224419

Magnetic phase diagram of the ferromagnetic Kondo-lattice compound ${CeAgSb}_{2}$ up to 80 kbar

V. A. Sidorov, E. D. Bauer, N. A. Frederick, J. R. Jeffries, S. Nakatsuji, N. O. Moreno, J. D. Thompson, M. B. Maple, and Z. Fisk

Phys. Rev. B 67, 224419 – Published 16 June 2003

Abstract

Electrical resistivity and ac-calorimetric measurements reveal a complex magnetic phase diagram for single crystals of the ferromagnetic Kondo-lattice compound ${CeAgSb}_{2}$ at high pressures up to 80 kbar. The ferromagnetic order at $T_{C} = 9.6 K$ at ambient pressure is completely suppressed at a critical pressure $P_{C} = 35 kbar .$ Another magnetic transition, possibly antiferromagnetic, found above 27 kbar, attains a maximum value $T_{N} \sim 6 K$ at 44 kbar and then appears to be completely suppressed by $\sim 50 kbar .$ Thermodynamic and transport measurements in the ferromagnetic state indicate an energy gap $Δ \sim 30 K$ in the spin-wave excitation spectrum at ambient pressure which decreases to $Δ \sim 10 K$ at $P = 30 kbar .$ No superconductivity is observed at ambient pressure above $T \sim 0.1 K,$ under applied pressure in the ferromagnetic state $(P = 28.5 kbar),$ nor in the antiferromagnetic state $(P = 33 - 46 kbar)$ above $0.3 K .$

Received 10 February 2003

DOI:https://doi.org/10.1103/PhysRevB.67.224419

Authors & Affiliations

V. A. Sidorov^1,*, E. D. Bauer^2,†, N. A. Frederick², J. R. Jeffries², S. Nakatsuji³, N. O. Moreno¹, J. D. Thompson¹, M. B. Maple², and Z. Fisk⁴

¹Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
²Department of Physics and Institute For Pure and Applied Physical Sciences, University of California, San Diego, La Jolla, California 92093, USA
³National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
⁴Department of Physics, Florida State University, Tallahassee, Florida 32306, USA

^*On leave from Institute for High Pressure Physics, Russian Academy of Sciences, 142190 Troitsk, Russia.
^†Present address: Los Alamos National Laboratory, Los Alamos, NM 87545, USA.

References (Subscription Required)

Click to Expand

Issue

Vol. 67, Iss. 22 — 1 June 2003

Reuse & Permissions

Access Options

Author publication services for translation and copyediting assistance advertisement

Physical Review B

covering condensed matter and materials physics