Sharp quantum phase transition in the frustrated spin-1/2 Ising chain antiferromagnet CaCoV2O7

Author:

Isha 1ORCID,Bera A. K.23,Kaur Guratinder45,Stock C.5,Chakraborty Koushik1,Puphal Pascal4,Isobe M.4,Küster K.4,Skourski Y.6,Bhaskaran L.6ORCID,Zvyagin S. A.6,Luther S.67,Gronemann J.6,Kühne H.6,Salazar Mejía C.6,Pregelj M.8ORCID,Hansen Thomas C.9ORCID,Kaushik S. D.110,Voneshen David1112,Kulkarni R.13,Lalla N. P.1,Yusuf S. M.23ORCID,Thamizhavel A.13ORCID,Yogi Arvind Kumar113ORCID

Affiliation:

1. UGC-DAE Consortium for Scientific Research

2. Bhabha Atomic Research Centre

3. Homi Bhabha National Institute

4. Max-Planck-Institut für Festkörperforschung

5. University of Edinburgh

6. Helmholtz-Zentrum Dresden-Rossendorf

7. TU Dresden

8. Jożef Stefan Institute

9. Institut Max von Laue-Paul Langevin

10. BARC

11. Rutherford Appleton Laboratory

12. Royal Holloway University of London

13. Tata Institute of Fundamental Research

Abstract

We report on a quantum critical behavior in the quasi-1D spin-1/2 zigzag frustrated chain antiferromagnet CaCoV2O7, induced by an applied magnetic field. Below TN=3.3 K our zero-field neutron diffraction studies revealed the up-up-down-down spin structure, stabilized by an order-by-disorder phenomenon. At base temperature, the magnetic order is suppressed by an applied magnetic field (B), inducing a transition into a quantum paramagnetic state at Bc=3 T, as revealed by both neutron diffraction and ESR data. The transition exhibits an unusually sharp phase boundary with the critical exponent ϕ=0.164(3)1/6, in contrast to the earlier experimental observations for uniform spin-1/2 chain systems. Such a sharp QPT is anticipated due to a rare combination of spin-orbit coupling and competing NN and NNN exchange interactions J1 and J2 of the zigzag spin chain. Published by the American Physical Society 2024

Funder

Max-Planck-Gesellschaft

Deutsche Forschungsgemeinschaft

Publisher

American Physical Society (APS)

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