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Pressure-dependent spin fluctuations and magnetic structure in the topologically frustrated spin glass alloy Y(Mn0.95Al0.05)(2)

Telling, M. T. F. ; Knight, K. S. ; Pratt, F. L. ; Church, A. J. ; Deen, Pascale LU ; Ellis, K. J. ; Watanabe, I. and Cywinski, R. (2012) In Physical Review B (Condensed Matter and Materials Physics) 85(18).
Abstract
Longitudinal field (LF = 110 G) muon spin relaxation (mu SR) has been used to investigate the pressure dependence (P < 4.5 kbar) of paramagnetic spin fluctuations in the spin glass alloy Y(Mn0.95Al0.05)(2) via observation of the mu(+) spin depolarization. External mechanical force is seen to counteract the Al-induced chemical pressure, fully delocalizing the Mn moment and altering the nature of the spin fluctuation spectrum sensed by the muon. A qualitative change in the functional form of the mu(+) spin depolarization is observed. Complementary ambient and high-pressure neutron diffraction measurements suggest not only pressure-dependent structural transitions but also the instability of the localized manganese moment. The ambient and... (More)
Longitudinal field (LF = 110 G) muon spin relaxation (mu SR) has been used to investigate the pressure dependence (P < 4.5 kbar) of paramagnetic spin fluctuations in the spin glass alloy Y(Mn0.95Al0.05)(2) via observation of the mu(+) spin depolarization. External mechanical force is seen to counteract the Al-induced chemical pressure, fully delocalizing the Mn moment and altering the nature of the spin fluctuation spectrum sensed by the muon. A qualitative change in the functional form of the mu(+) spin depolarization is observed. Complementary ambient and high-pressure neutron diffraction measurements suggest not only pressure-dependent structural transitions but also the instability of the localized manganese moment. The ambient and high-pressure mu(+) spin depolarization results from Y(Mn0.95Al0.05)(2) are likened to P = 0 results reported for other Y(Mn1-xAlx)(2) alloys. Finally, the possibility of using mu(+) spin depolarization rates to predict experimental inelastic neutron scattering (INS) line widths is considered; the muon having the potential to provide information equivalent to that obtained via INS but with greatly reduced data collection times. (Less)
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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B (Condensed Matter and Materials Physics)
volume
85
issue
18
publisher
American Physical Society
external identifiers
  • wos:000304173000003
  • scopus:84861658308
ISSN
1098-0121
DOI
10.1103/PhysRevB.85.184416
language
English
LU publication?
yes
id
39bec4cb-bdc7-4e6a-9a52-e55d7b69e392 (old id 2805966)
date added to LUP
2016-04-01 13:00:35
date last changed
2022-01-27 08:51:30
@article{39bec4cb-bdc7-4e6a-9a52-e55d7b69e392,
  abstract     = {{Longitudinal field (LF = 110 G) muon spin relaxation (mu SR) has been used to investigate the pressure dependence (P &lt; 4.5 kbar) of paramagnetic spin fluctuations in the spin glass alloy Y(Mn0.95Al0.05)(2) via observation of the mu(+) spin depolarization. External mechanical force is seen to counteract the Al-induced chemical pressure, fully delocalizing the Mn moment and altering the nature of the spin fluctuation spectrum sensed by the muon. A qualitative change in the functional form of the mu(+) spin depolarization is observed. Complementary ambient and high-pressure neutron diffraction measurements suggest not only pressure-dependent structural transitions but also the instability of the localized manganese moment. The ambient and high-pressure mu(+) spin depolarization results from Y(Mn0.95Al0.05)(2) are likened to P = 0 results reported for other Y(Mn1-xAlx)(2) alloys. Finally, the possibility of using mu(+) spin depolarization rates to predict experimental inelastic neutron scattering (INS) line widths is considered; the muon having the potential to provide information equivalent to that obtained via INS but with greatly reduced data collection times.}},
  author       = {{Telling, M. T. F. and Knight, K. S. and Pratt, F. L. and Church, A. J. and Deen, Pascale and Ellis, K. J. and Watanabe, I. and Cywinski, R.}},
  issn         = {{1098-0121}},
  language     = {{eng}},
  number       = {{18}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review B (Condensed Matter and Materials Physics)}},
  title        = {{Pressure-dependent spin fluctuations and magnetic structure in the topologically frustrated spin glass alloy Y(Mn0.95Al0.05)(2)}},
  url          = {{http://dx.doi.org/10.1103/PhysRevB.85.184416}},
  doi          = {{10.1103/PhysRevB.85.184416}},
  volume       = {{85}},
  year         = {{2012}},
}