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UID:DSC-18870
DTSTART;TZID=Europe/Berlin:20220705T145000
SEQUENCE:1656972492
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20220705T162000
URL:https://dresden-science-calendar.de/calendar/de/detail/18870
LOCATION:TUD\,    
SUMMARY:Baenitz: Non-oxy delafossite magnet AgCrSe2: Magnetic frustration\,
  short range correlations\, and field-tuned anisotropic cycloidal magnetic
  order
CLASS:PUBLIC
DESCRIPTION:Speaker: Michael Baenitz\nInstitute of Speaker: MPI-CPfS\nTopic
 s:\nPhysik\n Location:\n  Name: TUD ()\n  Street:   \n  City:  \n  Phone: 
 \n  Fax: \nDescription: <p><strong>Abstract:</strong></p>  <p>In contrast 
 to Cr-based oxy delafossites with predominant antiferromagnetic (afm) near
 est neighbor interaction in the planar Heisenberg triangular lattice\, AgC
 rSe2 as a representative of the non-oxy delafosites is characterized by co
 mpeting interactions (ferromagnetic nearest-neighbor vs afm third-neighbor
  interactions). Due to these competing interactions\, the magnetism in AgC
 rSe2 can be tuned by relatively small\, experimentally accessible magnetic
  fields\, allowing us to establish the complete anisotropic magnetic H-T p
 hase diagram in great detail. So far\, there are only a few single-crystal
  studies of Cr-based non-oxy (S\,Se\,Te) delafossites. We were able to suc
 cessfully grow large AgCrSe2 single crystals by chemical vapor transport a
 t the MPI-CPfS. The crystals have been carefully characterized and studied
  by magnetic susceptibility\, magnetization\, specific heat\, and thermal 
 expansion. In addition\, we used Cr-electron spin resonance and neutron di
 ffraction to probe the Cr 3d3 magnetism microscopically. Our studies evide
 nce an anisotropic magnetic order below TN = 32 K. Studies in collaboratio
 n with the Rossendorf High Field Laboratory and the ISIS Neutron and Muon 
 Facility (Oxford\, UK) demonstrate anisotropic cycloidal magnetic ordering
  with unusual extended two-dimensional fluctuations [1]. Previously unpubl
 ished magnetization measurements below 1 T indicate the presence of domain
 s which may have a chiral spin texture. This would also explain the unconv
 entional anomalous Hall effect. In contrast to the oxy delafossites (with 
 R-3m space group)\, the non-oxy delafossites have a reduced symmetry space
  group (R3m) which allows antisymmetric interactions (Dzyaloshinskii-Moriy
 a). Possibly this plays a role in small fields. In this respect\, small-an
 gle neutron-scattering experiments (SANS) in small magnetic fields are of 
 particular interest in the future.</p>  <p>M. Baenitz et al. Phys. Rev. B 
 <strong>104</strong>\, 134410 (2021)</p>  <p><strong>Room: REC/C213</stron
 g></p>  <p><strong>BigBlueButton</strong><strong>:</strong><br /> https://
 selfservice.zih.tu-dresden.de/l/link.php?m=175898&amp\;p=ef0deb8e (https:/
 /selfservice.zih.tu-dresden.de/l/link.php?m=175898&amp\;p=ef0deb8e) (TUD)<
 /p>  <p>https://selfservice.zih.tu-dresden.de/link.php?m=175898&amp\;p=c13
 15b84 (https://selfservice.zih.tu-dresden.de/link.php?m=175898&amp\;p=c131
 5b84) (External)</p>
DTSTAMP:20261005T145144Z
CREATED:20220513T221015Z
LAST-MODIFIED:20220704T220812Z
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