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Title: Frustration under pressure: Exotic magnetism in new pyrochlore oxides

Pyrochlore structures, of chemical formula A{sub 2}B{sub 2}O{sub 7} (A and B are typically trivalent and tetravalent ions, respectively), have been the focus of much activity in the condensed matter community due to the ease of substitution of rare earth and transition metal ions upon the two interpenetrating corner-shared tetrahedral lattices. Over the last few decades, superconductivity, spin liquid states, spin ice states, glassy states in the absence of chemical disorder, and metal-insulator transitions have all been discovered in these materials. Geometric frustration plays a role in the relevant physics of all of these phenomena. In the search for new pyrochlore materials, it is the R{sub A}/R{sub B} cation radius ratio which determines the stability of the lattice over the defect fluorite structure in the lower limit. Under ambient pressure, the pyrochlores are stable for 1.36 ≤ R{sub A}/R{sub B} ≤ 1.71. However, using high pressure synthesis techniques (1-10 GPa of pressure), metastable pyrochlores exist up to R{sub A}/R{sub B} = 2.30. Many of these compounds are stable on a timescale of years after synthesis, and provide a means to greatly enhance exchange, and thus test theories of quantum magnetism and search for new phenomena. Within this article, we reviewmore » new pyrochlore compounds synthesized via high pressure techniques and show how the ground states are extremely sensitive to chemical pressure.« less
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [3]
  1. Department of Chemistry, University of Winnipeg, Winnipeg, Manitoba R3B 2E9 (Canada)
  2. (Canada)
  3. Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1 (Canada)
Publication Date:
OSTI Identifier:
22415281
Resource Type:
Journal Article
Resource Relation:
Journal Name: APL materials; Journal Volume: 3; Journal Issue: 4; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CATIONS; CUBIC LATTICES; FLUORITE; GROUND STATES; LIQUIDS; MAGNETISM; OXIDES; PHASE STABILITY; PHASE TRANSFORMATIONS; PYROCHLORE; RARE EARTHS; SPIN; SUPERCONDUCTIVITY; SYNTHESIS; TRANSITION ELEMENTS