Heat capacity of the quantum magnet TiOCl

Abstract

Measurements of the heat capacity C(T,H) of the one-dimensional quantum magnet TiOCl are presented for temperatures 2K < T < 300K and magnetic fields up to 5T. Distinct anomalies at 91K and 67K signal two subsequent phase transitions. The lower of these transitions clearly is of first order and seems to be related to the spin degrees of freedom. The transition at 92K probably involves the lattice and/or orbital moments. A detailed analysis of the data reveals that the entropy change through both transitions is surprisingly small (~ 0.1R), pointing to the existence strong fluctuations well into the non-ordered high-temperature phase. No significant magnetic field dependence was detected.

arXiv comment4 pages, 2 figures

References in corpus (10)

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• Spin-Peierls transition in TiOCl
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Cited by in corpus (21)

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• Zero-field incommensurate spin-Peierls phase with interchain frustration in TiOCl
• Charge density wave order and fluctuations above T${}_{CDW}$ and below superconducting T${}_c$ in the kagome metal CsV${}_3$Sb${}_5$
• Spin-Peierls transition in TiPO${}_4$
• Spin dynamics in the low-dimensional magnet TiOCl
• X-ray Scattering Study of the spin-Peierls transition and soft phonon behavior in TiOCl
• Muon-spin relaxation measurements on the dimerized spin-1/2 chains NaTiSi2O6 and TiOCl
• Symmetry disquisition on the TiOX phase diagram
• Quantum spin state transitions in spin-1 equilateral triangular lattice antiferromagnet Na${}_2$BaNi(PO${}_4$)${}_2$
• Low-temperature heat transport of CuFe${}_{1-x}$Ga${}_x$O${}_2$ ($x=$ 0--0.12) single crystals
• One-dimensional versus two-dimensional correlation effects in the oxyhalides TiOCl and TiOBr
• Thermodynamics of the metal-insulator transition in the extended Hubbard model
• Commensurate Fluctuations in the Pseudogap and Incommensurate spin-Peierls Phases of TiOCl
• Density functional study of the electronic and vibrational properties of TiOCl
• Thermal conductivity of the diamond-chain compound Cu_3(CO_3)_2(OH)_2
• Cluster Dynamical Mean-field calculations for TiOCl
• Momentum-resolved single-particle spectral function for TiOCl from a combination of density functional and variational cluster calculations
• Critical properties of the unconventional spin-Peierls system TiOBr
• Suppression of the commensurate spin-Peierls state in Sc-doped TiOCl
• High pressure x-ray study of spin-Peierls physics in the quantum spin chain material TiOCl
• Heat conductivity of the spin-Peierls compounds TiOCl and TiOBr