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One-Third Magnetization Plateau with a Preceding Novel Phase in Volborthite.

H Ishikawa1, M Yoshida1, K Nawa1

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High-quality volborthite single crystals reveal a wide 1/3 magnetization plateau and novel phases. These findings in the distorted kagome antiferromagnet offer insights into frustrated spin systems.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Magnetism

Background:

  • Volborthite is a mineral with a distorted kagome lattice structure.
  • Kagome antiferromagnets are known for their magnetic frustration and complex spin behaviors.

Purpose of the Study:

  • To synthesize high-quality single crystals of volborthite.
  • To investigate the magnetic properties of volborthite under high magnetic fields.
  • To elucidate the spin structures and phase transitions in volborthite.

Main Methods:

  • Single crystal synthesis of volborthite.
  • High-field magnetization measurements up to 74 Tesla.
  • ^(51)V Nuclear Magnetic Resonance (NMR) measurements up to 30 Tesla.

Main Results:

  • Observation of an unprecedented wide 1/3 magnetization plateau above 28 T, persisting up to 74 T at 1.4 K.
  • Identification of an incommensurate spin-density wave order below 22 T.
  • Discovery of a novel intermediate phase (23-26 T) with linear magnetization dependence and inhomogeneous internal magnetic fields.

Conclusions:

  • The observed phase sequence in volborthite closely resembles theoretical models of frustrated spin chains with competing ferromagnetic (J1) and antiferromagnetic (J2) interactions.
  • High-quality single crystals are crucial for uncovering subtle magnetic phenomena in complex materials.
  • Volborthite serves as a promising platform for studying quantum magnetism in frustrated systems.