Tyck till om SwePub Sök
här!
Sökning: onr:"swepub:oai:DiVA.org:su-68834" >
Weak first-order qu...
Weak first-order quantum phase transition in the spin-tetrahedron system Cu(2)Te(2)O(5)Br(2) without lattice contributions
-
Wang, X. (författare)
-
Syassen, K. (författare)
-
- Johnsson, Mats (författare)
- Stockholms universitet,Avdelningen för oorganisk kemi och strukturkemi
-
visa fler...
-
Moessner, R. (författare)
-
Choi, K. -Y (författare)
-
Lemmens, P. (författare)
-
visa färre...
-
(creator_code:org_t)
- 2011
- 2011
- Engelska.
-
Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 83:13, s. 134403-
- Relaterad länk:
-
https://urn.kb.se/re...
-
visa fler...
-
https://doi.org/10.1...
-
visa färre...
Abstract
Ämnesord
Stäng
- Under pressure the spin tetrahedron system Cu(2)Te(2)O(5)Br(2) shows a softening of the collective magnetic mode whereas the energy of local spin-exchange processes increases. This apparent contradiction is due to the system's proximity to a quantum critical point induced by competing interactions that effectively decouple the tetrahedra. The high-pressure state is therefore nonmagnetic and dominated by valence bond excitations. Anomalies in the frequency and the intensity of magnetic Raman scattering are evidence for a weakly discontinuous evolution of the quantum critical state. In contrast, structural parameters as well as optical phonon modes evolve continuously with pressure without any sign for discontinuous criticality. No new low-energy excitations are observed. In contrast, the expected fingerprints of the spin-liquid phase are broadened due to Dzyaloshinskii-Moriya interactions.
Ämnesord
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
Hitta via bibliotek
Till lärosätets databas