Quantum antiferromagnet bluebellite comprising a maple-leaf lattice made of spin-
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 ions

Haraguchi, Yuya; Matsuo, Akira; Kindo, Koichi; Hiroi, Zenji

doi:10.1103/physrevb.104.174439

Cited by 9 publications

(1 citation statement)

References 43 publications

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“…While one would expect an electronic contribution to show up for metals, this linear relationship holds true for many insulators as well. A variety of phenomena such as 1D spin chains, structural disorder, and lattice vacancies has been known to produce such behavior. − The linear fits to the data give us γ values of 0.4(1) mJ mol –1 K –2 and 0.1(2) mJ mol –1 K –2 for the floating zone and flux samples, respectively. While small, these values are not unusual in scale for such insulating oxides. , The linear term can be correlated to the number vacancies according to where c is the correlation value based on the distribution of the energy gap from the Schottky contribution of the vacancies present.…”

Section: Resultsmentioning

confidence: 99%

Optimization of PbTiO₃ Single Crystals with Flux and Laser Floating Zone Method

Pressley

Sinha

Vivanco

et al. 2022

Crystal Growth & Design

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PbTiO 3 is an established high temperature ferroelectric and component of multiferroic devices. Single crystal growth of clean PbTiO 3 has largely been limited to flux growth, in part due to the volatility of PbTiO 3 near the melting point. We demonstrate the ability to grow single crystals of PbTiO 3 using the laser diode floating zone technique. Crystal quality is examined using Laue, powder, and single crystal X-ray diffraction. Low temperature specific heat and annealing experiments using thermogravimetric analysis/differential thermal analysis were used to compare the disorder and vacancies generated in the laser diode floating zone with those produced by flux growth. Samples grown using the floating zone method showed minimal oxygen deficiency, while samples grown via flux had a higher density of vacancies and metal impurities (determined using glow discharge mass spectrometry), resulting in room temperature ferromagnetic behavior. The use of laser diodes as a heating source in the optical floating zone technique is essential in the stability of the zone growth and could be applied for production and zone refinement of other volatile materials.

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Section: Resultsmentioning

confidence: 99%

Optimization of PbTiO₃ Single Crystals with Flux and Laser Floating Zone Method

Pressley

Sinha

Vivanco

et al. 2022

Crystal Growth & Design

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Triplon analysis of magnetic disorder and order in maple-leaf Heisenberg magnet

Ghosh

2024

J. Phys.: Condens. Matter

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The nearest-neighbor spin-1/2 Heisenberg model on the maple-leaf lattice formed by hexagons (coupling Jh), triangles (coupling Jt), and dimers (coupling Jd), is investigated in a parameter regime where Jh>0 and Jt, Jd<0. This investigation aims to identify regions hosting exotic valence-bond solid states. Two potential magnetically disordered ground states are identified, and their stability is assessed through plaquette-triplon mean-field analyses. The resulting quantum phase diagram reveals that at large |Jt| and |Jd|, the system adopts a magnetically disordered dimerized VBS state, while for small Jd, it stabilizes a Néel state. A second-order phase transition from the dimerized phase to a Néel phase is observed, which, being Landau-forbidden, suggests the potential presence of exotic phenomena such as a deconfined quantum critical point or the appearance of a quantum spin liquid. This work provides insights into the phase diagram of the nearest-neighbor spin-1/2 Heisenberg model on the maple-leaf lattice and lays the groundwork for further investigations into its intriguing physics.

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