English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Specific Heat Study of 1D and 2D Excitations in the Layered Frustrated Quantum Antiferromagnets Cs2CuCl4-xBrx

Tutsch, U., Tsyplyatyev, O., Kuhnt, M., Postulka, L., Wolf, B., Cong, P. T., et al. (2019). Specific Heat Study of 1D and 2D Excitations in the Layered Frustrated Quantum Antiferromagnets Cs2CuCl4-xBrx. Physical Review Letters, 123(14): 147202, pp. 1-6. doi:10.1103/PhysRevLett.123.147202.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/21.11116/0000-0005-1B85-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-1B89-3
Genre: Journal Article

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Tutsch, U.1, Author
Tsyplyatyev, O.1, Author
Kuhnt, M.1, Author
Postulka, L.1, Author
Wolf, B.1, Author
Cong, P. T.1, Author
Ritter, F.1, Author
Krellner, C.1, Author
Assmus, W.1, Author
Schmidt, B.2, Author              
Thalmeier, P.3, Author              
Kopietz, P.1, Author
Lang, M.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Burkhard Schmidt, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863464              
3Peter Thalmeier, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863457              

Content

show
hide
Free keywords: -
 Abstract: We report an experimental and theoretical study of the low-temperature specific heat C and magnetic susceptibility chi of the layered anisotropic triangular-lattice spin-1/2 Heisenberg antiferromagnets Cs2CuCl4-xBrx with x= 0, 1, 2, and 4. We find that the ratio J'/J of the exchange couplings ranges from 0.32 approximate to 0.78, implying a change (crossover or quantum phase transition) in the materials' magnetic properties from one-dimensional (1D) behavior for J'/J < 0.6 to two-dimensional (2D) behavior for J'/J approximate to 0.78. For J'/J < 0.6, realized for x= 0, 1, and 4, we find a magnetic contribution to the low-temperature specific heat, C-m proportional to T, consistent with spinon excitations in 1D spin-1/2 Heisenberg antiferromagnets. Remarkably, for x = 2, where J'/J approximate to 0.78 implies a 2D magnetic character, we also observe C-m( )proportional to T. This finding, which contrasts the prediction of C-m proportional to T-2 made by standard spin-wave theories, shows that Fermi-like statistics also plays a significant role for the magnetic excitations in spin-1/2 frustrated 2D antiferromagnets.

Details

show
hide
Language(s): eng - English
 Dates: 2019-10-012019-10-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 123 (14) Sequence Number: 147202 Start / End Page: 1 - 6 Identifier: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1