Fermi surface of the ferromagnetic semimetal, EuB{sub 6}

Journal Article · Mon Feb 01 04:00:00 EST 1999 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.59.4720· OSTI ID:306261

Aronson, M C ^[1]; Sarrao, J L; Fisk, Z; Whitton, M; Brandt, B L ^[2]

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1. The Harrison M. Randall Laboratory of Physics, University of Michigan, Ann Arbor, Michigan 48109-1120 (United States)
2. National High Magnetic Field Laboratory, 1800 E. Paul Dirac Drive, Tallahassee, Florida 32306 (United States)

We report the results of magnetoresistance and magnetization measurements on single crystal EuB{sub 6} for temperatures above and below the ferromagnetic ordering temperatures T{sub C}{sup +}=15.3 K and T{sub C}{sup {minus}}=12.5 K, in magnetic fields as large as 30 T. Shubnikov{endash}de Haas and de Haas{endash}van Alphen oscillations were observed with four fundamental frequencies. By comparison to band-structure calculations, we ascribe the orbits to small pockets of electrons and holes, centered at the {ital X} points. The effective masses and extremal areas of the pockets are in good agreement with the predictions of band-structure calculations. We conclude that EuB{sub 6} is an intrinsic semimetal and not a doped insulator. The intrinsic carrier concentration is 1.2{times}10{sup 20} cm{sup {minus}3}, although our sample is somewhat uncompensated, with a 65{percent} surplus of holes. There is no appreciable modification to the Fermi-surface dimensions or carrier masses with the onset of ferromagnetism. {copyright} {ital 1999} {ital The American Physical Society}

• OSTI ID: 306261
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 7 Vol. 59; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BORON ALLOYS
CARRIER DENSITY
CARRIER MOBILITY
DE HAAS-VAN ALPHEN EFFECT
EFFECTIVE MASS
ELECTRONIC STRUCTURE
EUROPIUM ALLOYS
EUROPIUM BORIDES
FERMI LEVEL
FERROMAGNETIC MATERIALS
MAGNETIZATION
MAGNETORESISTANCE
MONOCRYSTALS
SEMIMETALS
SHUBNIKOV-DE HAAS EFFECT