New relaxation processes in diluted Ho2 Ti2 O7

J. S. Gardner; K. C. Kam; G. Ehlers

doi:10.1016/j.physb.2009.09.104

New relaxation processes in diluted Ho₂ Ti₂ O₇

J. S. Gardner, K. C. Kam, G. Ehlers

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

We have studied the spin relaxation in diluted spin ice Ho_{2 - x} R_x Ti₂ O₇(R = La or Y) by means of neutron scattering. Remarkably, doping with nonmagnetic ions does not relieve the geometrical frustration and the dynamics of the freezing is unaltered whilst the cubic unit cell is maintained. When the nonmagnetic substitution starts to distort the lattice, a new relaxation process is revealed. We present new data from several diluted spin ice samples where Arrhenius behaviour observed in the parent compound, Ho₂ Ti₂ O₇ is superseded by other processes including a quantum tunnelling process.

Original language	English
Pages (from-to)	774-777
Number of pages	4
Journal	Physica B: Physics of Condensed Matter
Volume	405
Issue number	2
DOIs	https://doi.org/10.1016/j.physb.2009.09.104
State	Published - Jan 15 2010
Externally published	Yes

Funding

We thank our collaborators in Refs. [18,20] for their role in this ongoing study. We acknowledge useful discussions with M.J.P. Gingras, S.T. Bramwell, T. Fennell, J. Greedan, B.D. Gaulin. Support for this work was provided through ORNL/SNS which is managed by UT-Battelle, LLC, for the U.S. Department of Energy under Contract DE-AC05-00OR22725 and the Centre for High Resolution Neutron Scattering at NIST by the National Science Foundation under Agreement No. DMR-0454672.

Keywords

Magnetic frustration
Neutron-spin-echo
Spin-ice

Access to Document

10.1016/j.physb.2009.09.104

Cite this

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title = "New relaxation processes in diluted Ho2 Ti2 O7",

abstract = "We have studied the spin relaxation in diluted spin ice Ho2 - x Rx Ti2 O7(R = La or Y) by means of neutron scattering. Remarkably, doping with nonmagnetic ions does not relieve the geometrical frustration and the dynamics of the freezing is unaltered whilst the cubic unit cell is maintained. When the nonmagnetic substitution starts to distort the lattice, a new relaxation process is revealed. We present new data from several diluted spin ice samples where Arrhenius behaviour observed in the parent compound, Ho2 Ti2 O7 is superseded by other processes including a quantum tunnelling process.",

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T1 - New relaxation processes in diluted Ho2 Ti2 O7

AU - Gardner, J. S.

AU - Kam, K. C.

AU - Ehlers, G.

PY - 2010/1/15

Y1 - 2010/1/15

N2 - We have studied the spin relaxation in diluted spin ice Ho2 - x Rx Ti2 O7(R = La or Y) by means of neutron scattering. Remarkably, doping with nonmagnetic ions does not relieve the geometrical frustration and the dynamics of the freezing is unaltered whilst the cubic unit cell is maintained. When the nonmagnetic substitution starts to distort the lattice, a new relaxation process is revealed. We present new data from several diluted spin ice samples where Arrhenius behaviour observed in the parent compound, Ho2 Ti2 O7 is superseded by other processes including a quantum tunnelling process.

AB - We have studied the spin relaxation in diluted spin ice Ho2 - x Rx Ti2 O7(R = La or Y) by means of neutron scattering. Remarkably, doping with nonmagnetic ions does not relieve the geometrical frustration and the dynamics of the freezing is unaltered whilst the cubic unit cell is maintained. When the nonmagnetic substitution starts to distort the lattice, a new relaxation process is revealed. We present new data from several diluted spin ice samples where Arrhenius behaviour observed in the parent compound, Ho2 Ti2 O7 is superseded by other processes including a quantum tunnelling process.

KW - Magnetic frustration

KW - Neutron-spin-echo

KW - Spin-ice

UR - https://www.scopus.com/pages/publications/71549125264

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DO - 10.1016/j.physb.2009.09.104

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