Spin Vortex Crystal Order in Organic Triangular Lattice Compound

Kira Riedl, Elena Gati, David Zielke, Steffi Hartmann, Oleg M. Vyaselev, Nataliya D. Kushch, Harald O. Jeschke, Michael Lang, Roser Valentí, Mark V. Kartsovnik, and Stephen M. Winter
Phys. Rev. Lett. 127, 147204 – Published 29 September 2021
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Abstract

Organic salts represent an ideal experimental playground for studying the interplay between magnetic and charge degrees of freedom, which has culminated in the discovery of several spin-liquid candidates such as κ(ET)2Cu2(CN)3 (κCu). Recent theoretical studies indicate the possibility of chiral spin liquids stabilized by ring exchange, but the parent states with chiral magnetic order have not been observed in this material family. In this Letter, we discuss the properties of the recently synthesized κ(BETS)2Mn[N(CN)2]3 (κMn). Based on analysis of specific heat, magnetic torque, and NMR measurements combined with ab initio calculations, we identify a spin-vortex crystal order. These observations definitively confirm the importance of ring exchange in these materials and support the proposed chiral spin-liquid scenario for triangular lattice organics.

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  • Received 14 June 2021
  • Accepted 25 August 2021

DOI:https://doi.org/10.1103/PhysRevLett.127.147204

© 2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Kira Riedl1, Elena Gati2,3, David Zielke2, Steffi Hartmann2, Oleg M. Vyaselev4, Nataliya D. Kushch5, Harald O. Jeschke6, Michael Lang2, Roser Valentí1, Mark V. Kartsovnik7, and Stephen M. Winter8,*

  • 1Institut für Theoretische Physik, Goethe-Universität Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany
  • 2Physikalisches Institut, Goethe-Universität Frankfurt, Max von Laue Str 1, 60438 Frankfurt am Main, Germany
  • 3Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
  • 4Institute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, Russia
  • 5Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432 Chernogolovka, Russia
  • 6Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
  • 7Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, Walther-Meissner-Strasse 8, Garching D-85748, Germany
  • 8Department of Physics and Center for Functional Materials, Wake Forest University, Winston-Salem, North Carolina 27109, USA

  • *winters@wfu.edu

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Issue

Vol. 127, Iss. 14 — 1 October 2021

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