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SUMMARY:Crystal growth\, structure and magnetic frustration in rare earth 
 pyrochlore oxides - Monica Ciomaga Hatnean\, University of Warwick
DTSTART:20180221T111500Z
DTEND:20180221T123000Z
UID:TALK97156@talks.cam.ac.uk
CONTACT:Romy Hall
DESCRIPTION:Pyrochlore oxides\, A2B2O7 (where A = Rare Earth\, B = Transit
 ion Metal) are one of the most studied and puzzling classes of materials\,
  due to their characteristic crystallographic structure (both A and B site
 s form a 3D network or corner-sharing tetrahedra) and exotic magnetic prop
 erties\, such as spin ice\, spin glass\, spin liquid behaviour or long-ran
 ge magnetic ordered states [1\,2]. Significant progress has been made in t
 he two past decades in the study of pyrochlore frustrated magnets due to t
 he availability of large\, high quality single crystals of rare earth tita
 nium and molybdenum oxides [3]. One of the most exciting avenues of future
  research is into systems which exhibit novel magnetic ground states\, suc
 h as quantum spin liquid and quantum spin ice. As the search for frustrate
 d magnets that display quantum effects widens\, the research community has
  turned its attention to less studied pyrochlore systems\, such as rare ea
 rth zirconates and hafnates R2M2O7 (R = Rare Earth\, M= Zr or Hf). Recent 
 advances in the crystal growth by the floating zone method of pyrochlore o
 xides with high melting temperatures has opened a route to further investi
 gations of the zirconate and hafnate families of frustrated magnets [4\,5]
 . I will cover the recent developments in the synthesis of large high-qual
 ity crystals of these novel classes of pyrochlore oxides and discuss brief
 ly the challenges associated with their growth\, such as evaporation\, mix
 ed valence states\, structural phase transitions [6-8]. I will present a d
 etailed structural and magnetic study of members of the zirconate and hafn
 ate series of pyrochlore oxides\, and I will show how structural defects a
 ffect the fascinating magnetic behaviours of these materials [8-10].\n\n[1
 ] M. A. Subramanian\, Progress in Solid State Chemistry 15\, 55 (1983). [2
 ] J. S. Gardner\, Reviews of Modern Physics 82\, 53 (2010). [3] G. Balakri
 shnan\, Journal of Physics: Condensed Matter 10\, L723 (1998). [4] K. Mats
 uhira\, Journal of Physics: Conference Series 145\, 012031 (2009). [5] J. 
 Chun\, Journal of Materials Chemistry C 3\, 491 (2015). [6] M. Ciomaga Hat
 nean\, Journal of Crystal Growth 418\, 1 (2015). [7] M. Ciomaga Hatnean\, 
 Journal of Physics: Condensed Matter 29\, 075902 (2017). [8] R. Sibille\, 
 Nature Communications 8\, 892 (2017). [9] S. Petit\, Nature Physics\, 12\,
  746 (2016). [10] N. Martin\, Physical Review X 7\, 041028 (2017).\n
LOCATION:Mott Seminar Room (531)\, Cavendish Laboratory\, Department of Ph
 ysics
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