2005
DOI: 10.1103/physrevb.72.155116
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Thermal conductivity, thermopower, and figure of merit ofLa1xSrxCoO3

Abstract: We present a study of the thermal conductivity κ and the thermopower S of single crystals of La1−xSrxCoO3 with 0 ≤ x ≤ 0.3. For all Sr concentrations La1−xSrxCoO3 has rather low κ values. For the insulators (x < 0.18) this arises from a suppression of the phonon thermal conductivity by lattice disorder due to temperature-and/or doping-induced spin-state transitions of the Co ions. For larger x, the heat transport by phonons remains low, but an additional contribution from mobile charge carriers causes a modera… Show more

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Cited by 116 publications
(86 citation statements)
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“…6 Second, hole-doping drives a spin-state crossover to make Co 3+ ions adopt the intermediate or highspin state and causes various magnetic phases. [7][8][9][10][11][12][13][14] A doped Co 4+ ion dresses a cloud of magnetic Co 3+ ions, as observed by neutron scattering. 15 The double-exchange mechanism between the low-spin Co 4+ (t 2g 5 ) and the intermediatespin Co 3+ (e g 1 t 2g 5 ) stabilizes an itinerant ferromagnetic state in La 1−x Sr x CoO 3 and causes spin-glass or clusterglass behavior depending on the Sr concentration.…”
Section: Introductionmentioning
confidence: 86%
See 1 more Smart Citation
“…6 Second, hole-doping drives a spin-state crossover to make Co 3+ ions adopt the intermediate or highspin state and causes various magnetic phases. [7][8][9][10][11][12][13][14] A doped Co 4+ ion dresses a cloud of magnetic Co 3+ ions, as observed by neutron scattering. 15 The double-exchange mechanism between the low-spin Co 4+ (t 2g 5 ) and the intermediatespin Co 3+ (e g 1 t 2g 5 ) stabilizes an itinerant ferromagnetic state in La 1−x Sr x CoO 3 and causes spin-glass or clusterglass behavior depending on the Sr concentration.…”
Section: Introductionmentioning
confidence: 86%
“…LaCoO 3 -based oxides show fairly good thermoelectric properties at room temperature, 34,35 but the thermopower suddenly decreases to a few μV/K above 500 K, accompanied by a spin-state crossover. [36][37][38] In contrast, LaRhO 3 -based oxides are found to exhibit a large thermopower up to 800 K, 39,40 which is theoretically explained by Usui et al 41 Comparing the transport properties between La 1−x Sr x CoO 3 and La 1−x Sr x RhO 3 , 14,[38][39][40]42 we find three differences as follows: (i) For the same doping level, the resistivity of doped LaCoO 3 is one order of magnitude smaller than that of doped LaRhO 3 .…”
Section: Introductionmentioning
confidence: 98%
“…As shown in Fig. 1͑b͒, for LCO and LSCO is five times smaller than that of a single crystal, 20 respectively, which is attributed to the high porosity of the samples. This low thermal conductivity is important to maintain the large Figures 2͑a͒ and 2͑b͒ show the monitored temperatures as a function of time at points ͑1͒-͑4͒ in the forward direction ͑LSCO-top configuration͒ and the reverse direction ͑LCO-top configuration͒, respectively.…”
mentioning
confidence: 94%
“…LaCoO 3 and La 0.7 Sr 0.3 CoO 3 are good candidate materials for use in such a thermal rectifier for the following reasons: (1) these polycrystalline samples are so dense and hard empirically that the sample is considered to be mechanically strong; (2) the temperature dependences of the thermal conductivities of the two oxides are different, 17 and a rectifying coefficient larger than R = 1.07 reported in the carbon nanotube is expected; and (3) thermal conductivity with a small magnitude ($5 W/m K) compared with that of conventional metals and alloys ($100 W/m K) effectively maintains a large temperature gradient in the system. Because the latter is a characteristic of thermoelectric materials, LaCoO 3 and La 0.7 Sr 0.3 CoO 3 are potential elements for a thermal rectifier.…”
Section: Introductionmentioning
confidence: 99%