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Spin-singlet Quantum Ground State in Zigzag Spin Ladder Cu(CF3 COO)2.

Igor L Danilovich1, Elena V Karpova1, Igor V Morozov1

  • 1Moscow State University, Moscow, 119991, Russia.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|July 21, 2017
PubMed
Summary

This study introduces copper trifluoroacetate as a novel material for exploring low-dimensional magnets, revealing a spin-gap state without long-range magnetic ordering.

Keywords:
ab initio calculationselectron spin resonancemagnetic propertiesquantum ground statespin ladder

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Area of Science:

  • Condensed matter physics
  • Quantum magnetism
  • Materials science

Background:

  • Investigating quantum ground states in low-dimensional magnets is crucial for understanding exotic magnetic phenomena.
  • Copper trifluoroacetate, Cu(CF3COO)2, presents a unique solid-state platform with isolated magnetic monolayers.

Purpose of the Study:

  • To explore the quantum ground states of low-dimensional magnets using Cu(CF3COO)2.
  • To characterize the magnetic properties and interactions within the isolated magnetic monolayers.

Main Methods:

  • Static and dynamic magnetic measurements were employed to probe magnetic ordering and spin dynamics.
  • Specific heat measurements were conducted down to liquid helium temperatures to detect phase transitions.
  • First principles calculations were utilized to determine key magnetic exchange interaction parameters.

Main Results:

  • The compound Cu(CF3COO)2 exhibits a spin-gap state, indicating the absence of long-range magnetic ordering down to 4 Kelvin.
  • Static and dynamic magnetic measurements confirmed the presence of a spin-gap.
  • Calculations yielded exchange interaction parameters J⊥ = 176 K and J∥ = 12 K, consistent with a weakly interacting dimer model.

Conclusions:

  • Copper trifluoroacetate serves as an ideal system for studying isolated magnetic monolayers and their quantum ground states.
  • The observed spin-gap state and lack of long-range ordering highlight the unique magnetic properties of this material.
  • The findings support the weakly interacting dimers model for understanding the magnetic behavior of Cu(CF3COO)2.