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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Low energy spin dynamics in the spin ice Ho2Sn2O7.

G Ehlers1, A Huq, S O Diallo

  • 1Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6475, USA. ehlersg@ornl.gov

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|February 2, 2012
PubMed
Summary
This summary is machine-generated.

Ho2Sn2O7 exhibits quantum phase behavior similar to other spin ice materials but with a more antiferromagnetic character. Researchers measured a significant hyperfine field of approximately 700 T at the holmium nucleus.

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Area of Science:

  • Condensed matter physics
  • Magnetism
  • Quantum materials

Background:

  • Spin ice materials exhibit unique magnetic properties governed by geometric frustration.
  • Holmium stannate (Ho2Sn2O7) is a rare-earth pyrochlore material with potential spin ice characteristics.
  • Understanding the influence of lattice parameters on magnetic behavior is crucial for developing new quantum materials.

Purpose of the Study:

  • To investigate the magnetic properties of Ho2Sn2O7.
  • To compare Ho2Sn2O7 with other known spin ice compounds like Ho2Ti2O7.
  • To characterize the quantum phase transition and nuclear spin dynamics in Ho2Sn2O7.

Main Methods:

  • Magnetic property measurements across a range of temperatures.
  • Comparison of structural data (lattice expansion) with magnetic behavior.
  • Inelastic neutron scattering to probe magnetic excitations and nuclear spin interactions.

Main Results:

  • Ho2Sn2O7 shows similar high-temperature magnetic properties to Ho2Ti2O7, despite a 3% larger lattice.
  • The quantum phase transition in Ho2Sn2O7 occurs at a slightly higher temperature and exhibits a more antiferromagnetic character.
  • A weak inelastic mode linked to the holmium nuclear spin system was detected below 80 K.
  • The hyperfine field at the holmium nucleus was determined to be approximately 700 T.

Conclusions:

  • Ho2Sn2O7 represents a tunable spin ice system where lattice expansion influences magnetic ordering.
  • The observed antiferromagnetic character and nuclear spin interactions provide insights into quantum effects in frustrated magnets.
  • The significant hyperfine field suggests strong coupling between electronic and nuclear spins in this material.