Phonon Thermal Hall Effect in Strontium Titanate

Li, Xiaokang; Fauqué, Benoît; Zhu, Zengwei; Behnia, Kamran

doi:10.1103/physrevlett.124.105901

Cited by 117 publications

(96 citation statements)

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“…In the nonmagnetic insulator SrTiO 3 , a negative thermal Hall conductivity was recently observed 14 , with a magnitude comparable to that of the three cuprate Mott insulators (Table 1 ). There is little doubt that the thermal Hall effect in SrTiO 3 is due to phonons.…”

Section: Resultsmentioning

confidence: 81%

“…There is little doubt that the thermal Hall effect in SrTiO 3 is due to phonons. Importantly, the κ xy signal in the closely related oxide KTaO 3 is 30 times smaller (and of opposite sign) 14 (Table 1 ). The key difference between the two materials is that SrTiO 3 undergoes an antiferrodistortive structural transition at 105 K, whereas KTaO 3 remains cubic down to T ≈ 0 K. The authors of the study on those two materials conclude that the large signal in SrTiO 3 is linked to the structural domain boundaries that exist below 105 K (ref.…”

Section: Resultsmentioning

confidence: 97%

“…The key difference between the two materials is that SrTiO 3 undergoes an antiferrodistortive structural transition at 105 K, whereas KTaO 3 remains cubic down to T ≈ 0 K. The authors of the study on those two materials conclude that the large signal in SrTiO 3 is linked to the structural domain boundaries that exist below 105 K (ref. 14 ), although the precise mechanism whereby these confer chirality to phonons is still unclear. Our comparative study of the three cuprates allows us to rule out a similar role for structural domains.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, a large phononic κ xy has been observed in the nonmagnetic insulator SrTiO 3 (ref. 14 ). A proposed explanation involves the large ferroelectric susceptibility of this oxide insulator, together with an extrinsic mechanism whereby phonons are scattered by the polar boundaries from the antiferrodistortive structural transition at 105 K (ref.…”

Section: Introductionmentioning

confidence: 99%

“…This interpretation is supported by the fact that κ xy is negligible in the closely related material KTaO 3 (ref. 14 ), which remains cubic and free of structural domains.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Hall conductivity in the cuprate Mott insulators Nd2CuO4 and Sr2CuO2Cl2

et al. 2020

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The heat carriers responsible for the unexpectedly large thermal Hall conductivity of the cuprate Mott insulator La2CuO4 were recently shown to be phonons. However, the mechanism by which phonons in cuprates acquire chirality in a magnetic field is still unknown. Here, we report a similar thermal Hall conductivity in two cuprate Mott insulators with significantly different crystal structures and magnetic orders – Nd2CuO4 and Sr2CuO2Cl2 – and show that two potential mechanisms can be excluded – the scattering of phonons by rare-earth impurities and by structural domains. Our comparative study further reveals that orthorhombicity, apical oxygens, the tilting of oxygen octahedra and the canting of spins out of the CuO2 planes are not essential to the mechanism of chirality. Our findings point to a chiral mechanism coming from a coupling of acoustic phonons to the intrinsic excitations of the CuO2 planes.

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Section: Resultsmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…This interpretation is supported by the fact that κ xy is negligible in the closely related material KTaO 3 (ref. 14 ), which remains cubic and free of structural domains.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Hall conductivity in the cuprate Mott insulators Nd2CuO4 and Sr2CuO2Cl2

et al. 2020

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Large Thermal Hall Effect in Spinel FeCr2$_2$S4$_4$

Zhou,

Wu,

Sui

et al. 2024

Adv Funct Materials

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The thermal Hall effect (THE) is an important experimental probe of band topology and elementary excitations. Here, a large thermal Hall angle (THA) κxy/κxx ≈ 7 × 10−3 discovered so far in ferrimagnetic spinel FeCr2S4 and a large thermal Hall conductivity (κxy) discovered first in spinel structure and reaching a magnitude of at 50 K with a small magnetic field of 0.1 T are reported. These results suggest the emergence of nontrivial topological excitations in FeCr2S4. A large THA in spin caloritronics devices means that a small number of excitations can produce a large transverse signal. FeCr2S4 is therefore a potential platform for spintronics‐magnonics applications, and may enhance the knowledge of the thermal Hall effect.

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Effect of Strain on the Lattice Thermal Conductivity in SrTiO₃ from First‐Principles Calculations

Jiang

Zhou

2022

Physica Rapid Research Ltrs

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SrTiO 3 (STO), as a typical perovskite material, has many interesting physical properties and important applications. Above 105 K, STO has a simple cubic structure. At 105 K, STO undergoes a cubic to tetragonal antiferrodistortive transition with the rotations of TiO 6 octahedra. [1] At very low temperatures, STO approaches a ferroelectric phase transition but it remains paraelectric due to quantum fluctuations. [2][3][4] The doped STO is found to be an unconventional superconductor that does not fit into the standard BCS paradigm. [5,6] STO is also an excellent substrate for the epitaxial growth of many oxide thin films. [7] In recent years, with the development of experiments and theories, the thermal transport properties of STO have received lots of attention, such as the Poiseuille flow of phonons at low temperatures, [8] the unexpectedly large thermal Hall effect, [9][10][11] and tuning of the thermal conductivity. [12][13][14][15][16][17][18][19][20][21] Thermal conductivity is of vital importance in the practical applications of materials. High thermal conductivity is required in high-power electronic devices [22] while low thermal conductivity is essential in thermoelectric engineering. [23] The high thermal stability renders STO a unique advantage in thermoelectric applications and many other investigations. [24][25][26][27][28][29] Efforts have been made to reduce the thermal conductivity of STO in recent years, such as nanostructures [13][14][15] and defect engineering. [16][17][18] Strain engineering is another approach to reducing the thermal conductivity of STO. [18][19][20][21] For example, Wiedigen et al. grew homoepitaxial STO thin films under different conditions and found that the intrinsic strain caused by preparation-induced point defects could largely change the thermal conductivity. [18] In experiments, heteroepitaxial growth is an effective way to introduce epitaxial strain by lattice mismatch. A previous theoretical research based on the Landau-Ginzburg-Devonshire theory suggests that a biaxial compressive or tensile strain will stabilize the ferroelectric state in STO. [1] Near room temperatures, the in-plane polarization in tensile strained STO films is confirmed in the experiment with the DyScO 3 (DSO) substrates. [30] For another work, the compressed STO films grown on ðLaAlO 3 Þ 0.3 ðSr 2 AlTaO 6 Þ 0.7 (LSAT) substrates would have an out-of-plane polarization with a Curie temperature of %148 K. [31,32] Li et al. found that in STO films grown under a sufficiently large biaxial strain(%1%), the ferroelectric transition always precedes the antiferrodistortive structural transition. [33] Another experiment shows that STO films grown on DSO substrates undergo a possible antiferrodistortive structural transition around 180 K. [34] Additionally, theoretical phase diagrams also indicate that at room temperatures STO films grown on LSAT substrates are paraelectric and those grown on DSO substrates are purely ferroelectric. [1,33] Therefore, at room temperatures, no rotation of TiO 6 octahedra...

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Phonon Thermal Hall Effect in Strontium Titanate

Cited by 117 publications

References 50 publications

Thermal Hall conductivity in the cuprate Mott insulators Nd2CuO4 and Sr2CuO2Cl2

Thermal Hall conductivity in the cuprate Mott insulators Nd2CuO4 and Sr2CuO2Cl2

Large Thermal Hall Effect in Spinel FeCr2$_2$S4$_4$

Effect of Strain on the Lattice Thermal Conductivity in SrTiO₃ from First‐Principles Calculations

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Phonon Thermal Hall Effect in Strontium Titanate

Cited by 117 publications

References 50 publications

Thermal Hall conductivity in the cuprate Mott insulators Nd2CuO4 and Sr2CuO2Cl2

Thermal Hall conductivity in the cuprate Mott insulators Nd2CuO4 and Sr2CuO2Cl2

Large Thermal Hall Effect in Spinel FeCr2$_2$S4$_4$

Effect of Strain on the Lattice Thermal Conductivity in SrTiO3 from First‐Principles Calculations

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Effect of Strain on the Lattice Thermal Conductivity in SrTiO₃ from First‐Principles Calculations