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Title: mu. SR measurement of rare-earth moment dynamics in the Ho/sub x/Lu/sub 1-x/Rh/sub 4/B/sub 4/ ternary alloy system

Abstract

..mu..SR measurements have been carried out in the ternary rare-earth system Ho/sub x/Lu/sub 1-x/Rh/sub 4/B/sub 4/, x = 0, 0.7, and 1, to study the effects of superconductivity and magnetic order on Ho moment dynamics in this alloy series. In nonmagnetic LuRh/sub 4/B/sub 4/, muon relaxation is due to nuclear dipolar fields; the decrease of the relaxation rate above approx.200 K is attributed to the onset of muon diffusion at this temperature. In HoRh/sub 4/B/sub 4/, the zero-field relaxation rate ..lambda..(T) exhibits a strong maximum well above the magnetic ordering temperature T/sub M/ = 6.6 K, but no singularity at T/sub M/. Instead, the relaxation function develops a form indicative of very slow Ho moment fluctuations below approx.9 K. The high-temperature relaxation rates are too low to be explained by a ferromagnetic mean-field estimate of the exchange frequency; interactions of competing signs may be involved. For x = 0.7, where reentrant superconductivity is observed between T/sub M/ = 4.1 K and T/sub S/ = 7.7 K, a shoulder in ..lambda..(T) is observed between T/sub M/ and T/sub S/. This seems to indicate an important effect of superconductivity on Ho moment dynamics.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
OSTI Identifier:
5585370
Resource Type:
Journal Article
Journal Name:
J. Appl. Phys.; (United States)
Additional Journal Information:
Journal Volume: 53:3
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BORON ALLOYS; CRITICAL TEMPERATURE; MAGNETIC MOMENTS; MUON PROBES; RELAXATION; SUPERCONDUCTIVITY; HOLMIUM ALLOYS; LUTETIUM ALLOYS; RHODIUM ALLOYS; DIFFUSION; ELECTRON SPIN RESONANCE; FERROMAGNETISM; ULTRALOW TEMPERATURE; ALLOYS; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; MAGNETIC RESONANCE; MAGNETISM; PHYSICAL PROPERTIES; PLATINUM METAL ALLOYS; PROBES; RARE EARTH ALLOYS; RESONANCE; THERMODYNAMIC PROPERTIES; TRANSITION TEMPERATURE; 360104* - Metals & Alloys- Physical Properties; 656102 - Solid State Physics- Superconductivity- Acoustic, Electronic, Magnetic, Optical, & Thermal Phenomena- (-1987)

Citation Formats

Boekema, C, Heffner, R H, Hutson, R L, Leon, M, Schillaci, M E, Smith, J L, Dodds, S A, and MacLaughlin, D E. mu. SR measurement of rare-earth moment dynamics in the Ho/sub x/Lu/sub 1-x/Rh/sub 4/B/sub 4/ ternary alloy system. United States: N. p., 1982. Web. doi:10.1063/1.330918.
Boekema, C, Heffner, R H, Hutson, R L, Leon, M, Schillaci, M E, Smith, J L, Dodds, S A, & MacLaughlin, D E. mu. SR measurement of rare-earth moment dynamics in the Ho/sub x/Lu/sub 1-x/Rh/sub 4/B/sub 4/ ternary alloy system. United States. doi:10.1063/1.330918.
Boekema, C, Heffner, R H, Hutson, R L, Leon, M, Schillaci, M E, Smith, J L, Dodds, S A, and MacLaughlin, D E. Mon . "mu. SR measurement of rare-earth moment dynamics in the Ho/sub x/Lu/sub 1-x/Rh/sub 4/B/sub 4/ ternary alloy system". United States. doi:10.1063/1.330918.
@article{osti_5585370,
title = {mu. SR measurement of rare-earth moment dynamics in the Ho/sub x/Lu/sub 1-x/Rh/sub 4/B/sub 4/ ternary alloy system},
author = {Boekema, C and Heffner, R H and Hutson, R L and Leon, M and Schillaci, M E and Smith, J L and Dodds, S A and MacLaughlin, D E},
abstractNote = {..mu..SR measurements have been carried out in the ternary rare-earth system Ho/sub x/Lu/sub 1-x/Rh/sub 4/B/sub 4/, x = 0, 0.7, and 1, to study the effects of superconductivity and magnetic order on Ho moment dynamics in this alloy series. In nonmagnetic LuRh/sub 4/B/sub 4/, muon relaxation is due to nuclear dipolar fields; the decrease of the relaxation rate above approx.200 K is attributed to the onset of muon diffusion at this temperature. In HoRh/sub 4/B/sub 4/, the zero-field relaxation rate ..lambda..(T) exhibits a strong maximum well above the magnetic ordering temperature T/sub M/ = 6.6 K, but no singularity at T/sub M/. Instead, the relaxation function develops a form indicative of very slow Ho moment fluctuations below approx.9 K. The high-temperature relaxation rates are too low to be explained by a ferromagnetic mean-field estimate of the exchange frequency; interactions of competing signs may be involved. For x = 0.7, where reentrant superconductivity is observed between T/sub M/ = 4.1 K and T/sub S/ = 7.7 K, a shoulder in ..lambda..(T) is observed between T/sub M/ and T/sub S/. This seems to indicate an important effect of superconductivity on Ho moment dynamics.},
doi = {10.1063/1.330918},
journal = {J. Appl. Phys.; (United States)},
number = ,
volume = 53:3,
place = {United States},
year = {1982},
month = {3}
}