Critical magnetic excitations beyond the Tomonaga-Luttinger liquid description in a Heisenberg-Ising quantum spin chain antiferromagnet
Quantum magnets consisting of weakly coupled antiferromagnetic (AFM) Heisenberg-Ising spin chains are intriguing. The magnetic ground state of an isolated chain is Néel order, which is not stable in a magnetic field. Above a critical value, there is a transition into the renowned disordered state Tomonaga-Luttinger liquid (TLL). The spin fluctuations of a TLL are featured by a longitudinal (transverse) mode at intermediate (high) fields. In addition, the disordered state can host other quasi particles, e.g. (anti)psinons and Bethe strings. Magnetic long range order develops at a finite temperature once the interchain interactions become energetically relevant. This transforms the three possible states of a pair of spinons into two transverse and one longitudinal modes. The latter serves as the condensed-matter analogue of the Higgs boson in particle physics. This proposal aims to explore the critical role of the psinon-antipsinons in the formation of the field-induced spin density wave and emergent AFM order in SrCo2V2O8. Previously, these two states were attributed to the condensation of the longitudinal and transverse modes of a TLL.
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SHEN Lingjia; BLACKBURN Elizabeth; BOEHM Martin; BOOTHROYD Andrew Timothy; CAMPILLO Emma; PRABHAKARAN Dharmalingam; STEFFENS Paul and Denis M. Vasiukov. (2019). Critical magnetic excitations beyond the Tomonaga-Luttinger liquid description in a Heisenberg-Ising quantum spin chain antiferromagnet. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-05-754
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