Magnetization plateaus of spin- 12 system on a 5/7 skewed ladder

Dey, D and Das, S and Kumar, M and Ramasesha, S (2020) Magnetization plateaus of spin- 12 system on a 5/7 skewed ladder. In: Physical Review B, 101 (19).

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Abstract

Magnetization plateaus are some of the most striking manifestations of frustration in low-dimensional spin systems. We present numerical studies of magnetization plateaus in the fascinating spin-1/2 skewed ladder system obtained by alternately fusing five- and seven-membered rings. This system exhibits three significant plateaus at m=1/4, 1/2, and 3/4, consistent with the Oshikawa-Yamanaka-Affleck condition. Our numerical as well as perturbative analysis shows that the ground state can be approximated by three weakly coupled singlet dimers and two free spins, in the absence of a magnetic field. With increasing applied magnetic field, the dimers progressively become triplets with large energy gaps to excited states, giving rise to stable magnetization plateaus. Finite-temperature studies show that m=1/4 and 1/2 plateaus are robust and survive thermal fluctuations while the m=3/4 plateau shrinks rapidly due to thermal noise. The cusps at the ends of a plateau follow the algebraic square-root dependence on B.

Item Type:	Journal Article
Publication:	Physical Review B
Publisher:	American Physical Society
Additional Information:	Copy right for this article belongs to American Physical Society
Keywords:	Ground state; Ladders; Magnetic fields, Applied magnetic fields; Finite temperatures; Ladder system; Low-dimensional spin systems; Magnetization plateaus; Seven-membered rings; Square-root dependence; Thermal fluctuations, Magnetization
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	14 Oct 2020 10:19
Last Modified:	14 Oct 2020 10:19
URI:	http://eprints.iisc.ac.in/id/eprint/65730

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