Thermal conductivity of the diamond-chain compound Cu3(CO3)2(OH)2

Wu, Jie; Song, Jiangluqi; Zhao, Zhuan; Shi, Junxiang; Xu, Hui; Zhao, Jin; Liu, X G; Zhao, Xia; Sun, Xiaofeng

doi:10.1088/0953-8984/28/5/056002

Cited by 10 publications

(16 citation statements)

References 59 publications

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“…Recently, the similar behavior was found in the thermal conductivity of the diamond-chain compound Cu 3 (CO 3 ) 2 (OH) 2 (CHC) [88]. CHC is the first experimental realization of 1D distorted diamond-chain model [89], in which the dimerized singlet ground state separated from the excited triplet states by a gap Δ ≈ 50 K [88].…”

Section: Heat Transport In the Spin Dimer Systemsupporting

confidence: 63%

“…CHC is the first experimental realization of 1D distorted diamond-chain model [89], in which the dimerized singlet ground state separated from the excited triplet states by a gap Δ ≈ 50 K [88]. The earlier studies indicated that CHC can be simply described as a combination of spin-dimer and spin-chain systems.…”

Section: Heat Transport In the Spin Dimer Systemmentioning

confidence: 99%

“…The total resonant scattering rate is written as Figure 16 shows the best fitted result to (T) with parameters ∆ 1 = 50.5 K, and ∆ 2 = 7.5 K [88]. They are comparable to the intra-dimer and intra-monomer exchanges (58.0 K and 8.14 K), respectively, determined by the specific heat [88]. In particular, ∆ 2 is close to the gap of ~ 1.2 meV at the zone boundary detected by the neutron scattering [104].…”

Section: Heat Transport In the Spin Dimer Systemmentioning

confidence: 99%

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Low-temperature heat transport of spin-gapped quantum magnets

Zhao

Liu

et al. 2016

Sci. China Phys. Mech. Astron.

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This article reviews low-temperature heat transport studies of spin-gapped quantum magnets in the last few decades. Quantum magnets with small spins and low dimensionality exhibit a variety of novel phenomena. Among them, some systems are characteristic of having quantum-mechanism spin gap in their magnetic excitation spectra, including spin-Peierls systems, S = 1 Haldane chains, S = 1/2 spin ladders, and spin dimmers. In some particular spin-gapped systems, the XY-type antiferromagnetic state induced by magnetic field that closes the spin gap can be described as a magnon Bose-Einstein condensation (BEC). Heat transport is effective in probing the magnetic excitations and magnetic phase transitions, and has been extensively studied for the spin-gapped systems. A large and ballistic spin thermal conductivity was observed in the two-leg Heisenberg S = 1/2 ladder compounds. The characteristic of magnetic thermal transport of the Haldane chain systems is quite controversial on both the theoretical and experimental results. For the spin-Peierls system, the spin excitations can also act as heat carriers. In spin-dimer compounds, the magnetic excitations mainly play a role of scattering phonons. The magnetic excitations in the magnon BEC systems displayed dual roles, carrying heat or scattering phonons, in different materials.

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Section: Heat Transport In the Spin Dimer Systemsupporting

confidence: 63%

Section: Heat Transport In the Spin Dimer Systemmentioning

confidence: 99%

Section: Heat Transport In the Spin Dimer Systemmentioning

confidence: 99%

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Low-temperature heat transport of spin-gapped quantum magnets

Zhao

Liu

et al. 2016

Sci. China Phys. Mech. Astron.

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“…The thermal conductivity was measured by using a conventional steady-state technique. 10,11,[25][26][27] In these measurements, the magnetic field is parallel to the heat current (J H ), which is along the lengths of the samples. The specific heat was measured by the relaxation method using a commercial physical property measurement system (PPMS, Quantum Design).…”

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confidence: 99%

“…This is a common phenomenon in those insulators exhibiting magnetic phase transitions. 8,10,[25][26][27]29 Naturally, such kind of dip is caused by strong phonon scattering by the critical spin fluctuations associated with the magnetic phase transition.…”

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Heat switch effect in an antiferromagnetic insulator Co3V2O8

Zhao

et al. 2016

Applied Physics Letters

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We report a heat switch effect in single crystals of an antiferromagnet Co 3 V 2 O 8 , that is, the thermal conductivity (κ) can be changed with magnetic field in an extremely large scale. Due to successive magnetic phase transitions at 12-6 K, the zero-field κ(T ) displays a deep minimum at 6.7 K and rather small magnitude at low temperatures. Both the temperature and field dependencies of κ demonstrate that the phonons are strongly scattered at the regime of magnetic phase transitions. Magnetic field can suppress magnetic scattering effect and significantly recover the phonon thermal conductivity. In particular, a 14 T field along the a axis increases the κ at 7.5 K up to 100 times. For H c, the magnitude of κ can be suppressed down to ∼ 8% at some field-induced transition and can be enhanced up to 20 times at 14 T. The present results demonstrate that it is possible to design a kind of heat switch in the family of magnetic materials. Heat switches are devices that switch as needed between roles of good thermal conductors and good thermal insulators. They have wide and important applications in not only the cryogenics but also the deep space detectors, space coolers and spacecrafts. 1-4 A famous heat switch used in cryogenic cryostat is made by metal superconductors, whose electronic thermal conductivity can be switched on by applying magnetic field to suppress the superconductivity. 1 This kind of heat switch works only at very low temperatures (well below the superconducting transition temperatures or at subKelvin temperatures). Since the phonon thermal conductivity at such low temperatures are negligibly small, the total thermal conductivity can be changed by several orders of magnitude with magnetic field, a nearly ideal thermal insulator to good thermal conductor transition. At not very low temperatures, the thermal conductivity (κ) of any materials usually cannot be significantly changed by control parameter, 5,6 since there is always sizeable phonon thermal conductivity which is not easily changed much. However, past decades studies on the heat transport of magnetic materials have revealed that the phonon thermal conductivity can be remarkably changed by magnetic field in the case there is strong scattering between phonons and magnetic excitations. 7-12 In partica) Electronic mail: lxgrz@ustc.edu.cn b) Electronic mail: xfsun@ustc.edu.cn ular, a large magnetic-field-induced increase of κ can be observed in rare-earth manganites and titanates. 10,11 In this Letter, we report exceptionally large magnetothermal conductivity in an antiferromagnetic insulator, Co 3 V 2 O 8 . As large as 100 times increase of κ in magnetic field was found at temperature of several kelvins. The result provides a possible route to find heat switch devices that can work at not very low temperatures.Co 3 V 2 O 8 has a crystal lattice with space group Cmca. 2,3 The edge sharing CoO 6 octahedra form a staircase kagomé structure and the kagomé staircase lattices are separated by the nonmagnetic VO 4 tetrahedra (see Fig. S1 of the Sup...

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