Muon-spin relaxation measurements on the dimerized spin-1/2 chains NaTiSi2O6 and TiOCl

Abstract

We report muon spin relaxation (muSR) and magnetic susceptibility investigations of two Ti3+ chain compounds which each exhibit a spin gap at low temperature, NaTiSi2O6 and TiOCl. From these we conclude that the spin gap in NaTiSi2O6 is temperature independent, with a value of 2*Delta=660(50)K, arising from orbital ordering at Too = 210K; the associated structural fluctuations activate the muon spin relaxation rate up to temperatures above 270K. In TiOCl we find thermally activated spin fluctuations corresponding to a spin gap 2*Delta=420(40)K below Tc1=67K. We also compare the methods used to extract the spin gap and the concentration of free spins within the samples from muSR and magnetic susceptibility data.

4 pages, 3 figures

References in corpus (5)

• Heat capacity of the quantum magnet TiOCl
• Unusual quasi-one-dimensional electron dispersions in the spin-1/2 quantum magnet TiOCl
• Spin dynamics in the low-dimensional magnet TiOCl
• Comment on ``Sodium Pyroxene NaTiSi${}_2$O${}_6$: Possible Haldane Spin-1 Chain System''
• Orbital-Peierls State in NaTiSi2O6

Cited by in corpus (17)

• Electronic structure and magnetic properties of pyroxenes (Li,Na)TM(Si,Ge)2O6: novel low-dimensional magnets with 90 bonds
• Two-dimensional spin liquid behaviour in the triangular-honeycomb antiferromagnet TbInO${}_3$
• X-ray Scattering Study of the spin-Peierls transition and soft phonon behavior in TiOCl
• Symmetry disquisition on the TiOX phase diagram
• μSR-detection of the soft-mode toward the exotic magnetic ground state in bond-disordered quantum spin system IPA-Cu(Cl${}_{0.35}$Br${}_{0.65}$)${}_3$
• Muon-spin relaxation and heat capacity measurements on the magnetoelectric and multiferroic pyroxenes LiFeSi2O6 and NaFeSi2O6
• Dual Orbital Degeneracy Lifting in a Strongly Correlated Electron System
• Commensurate Fluctuations in the Pseudogap and Incommensurate spin-Peierls Phases of TiOCl
• Singlet-Triplet Excitations in the Unconventional Spin-Peierls System TiOBr
• Critical properties of the unconventional spin-Peierls system TiOBr
• Suppression of the commensurate spin-Peierls state in Sc-doped TiOCl
• Spin-gap formation due to spin-Peierls instability in $\pi$-orbital-ordered NaO${}_2$
• Heat conductivity of the spin-Peierls compounds TiOCl and TiOBr
• Absence of static magnetic order in lightly-doped Ti1-xScxOCl down to 1.7 K
• Spin-liquid-like spin dynamics in the frustrated antiferromagnet TbBO3
• Orbital disorder and ordering in NaTiSi2O6: 29Si and 23Na NMR Study
• \muSR-dtected Soft mode toward a Possible Phase Transition in disordered spin gap system (CH3)2CHNH3-Cu(ClxBr1-x)3