Crystal fields in Sc, Y, and the heavy-rare-earth metals Tb, Dy, Ho, Er, Tm, and Lu

Journal Article · Mon Aug 01 04:00:00 EDT 1977 · Phys. Rev., B; (United States)

DOI:https://doi.org/10.1103/PhysRevB.16.1201· OSTI ID:7215097

Touborg, P

Experimental investigations of the magnetic poperties of dilute alloys of the rare-earth solutes Tb, Dy, Ho, Er, and Tm in the nonmagnetic hosts Lu, Y, and Sc have been performed. These measurements, which include and supplement earlier published results, have been analyzed and crystal-field parameters for all these 15 alloy systems deduced. The consistency of the parameters was confirmed by a variety of magnetic measurements, including neutron spectroscopy. Crystal-field parameters have also been derived for the ions in pure magnetic rare-earth metals and their alloys using the results for the dilute alloys supplemented with paramagnetic measurements up to high temperatures on the concentrated systems. Mean values and standard deviations of the higher-order crystal-field parameters for all Y and Lu alloys are B/sub 40//..beta.. = 6.8 +- 0.9 K, B/sub 60//..gamma.. = 13.6 +- 0.7 K, and B/sub 66//..gamma.. = (9.7 +- 1.1) B/sub 60//..gamma... These values: with the inaccuracies somewhat increased: are expected to be representative also for the magnetic rare-earth metals. For rare-earth ions in the Sc host the values B/sub 40//..beta.. = 9.9 +- 1.9 K, B/sub 60//..gamma.. = 19.8 +- 1.5 K, and B/sub 66//..gamma.. = (9.4 +- 0.9) B/sub 60//..gamma.. were deduced. B/sub 20//..cap alpha.. is a host-sensitive parameter which has the average values of -102.7, -53.4, and 29.5 K for rare-earth ions in Y, Lu, and Sc, respectively. There is also evidence that this parameter varies with the solute. B/sub 20//..cap alpha.. for ions in the pure magnetic rare-earth metals and their alloys shows a linear variation with c/a ratio characteristic of each ion. The results indicate a contribution from anisotropic exchange to the high-temperature paramagnetic anisotropy of approximately 20% for Tb, Dy, Ho, and Er, and approximately 10% for Tm.

• Research Organization: Department of Electrophysics, Technical University, Lyngby, Denmark
• OSTI ID: 7215097
• Journal Information: Phys. Rev., B; (United States), Journal Name: Phys. Rev., B; (United States) Vol. 16:3; ISSN PLRBA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
CRYSTAL FIELD
DYSPROSIUM
DYSPROSIUM ALLOYS
ELEMENTS
ERBIUM
ERBIUM ALLOYS
HOLMIUM
HOLMIUM ALLOYS
LUTETIUM
LUTETIUM ALLOYS
MAGNETIC PROPERTIES
METALS
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
RARE EARTHS
SCANDIUM
SCANDIUM ALLOYS
TERBIUM
TERBIUM ALLOYS
THULIUM
THULIUM ALLOYS
TRANSITION ELEMENTS
YTTRIUM
YTTRIUM ALLOYS