Quantum spin liquid: design of a quantum spin liquid next to a superconducting state based on a dimer-type ET Mott insulator

2015 ◽  
Vol 3 (6) ◽  
pp. 1378-1388 ◽  
Author(s):  
Takaaki Hiramatsu ◽  
Yukihiro Yoshida ◽  
Gunzi Saito ◽  
Akihiro Otsuka ◽  
Hideki Yamochi ◽  
...  
Keyword(s):  
Superconducting State ◽  
Material Design ◽  
Mott Insulator ◽  
Quantum Spin ◽  
Spin Liquid ◽  
Quantum Spin Liquid

We propose the material design for a quantum spin liquid next to a superconducting state based on a dimer-type ET Mott insulator.

scholarly journals Pressure-Tuned Superconducting Dome in Chemically-Substituted κ-(BEDT-TTF)2Cu2(CN)3

Crystals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 817
Author(s):  
Yohei Saito ◽  
Anja Löhle ◽  
Atsushi Kawamoto ◽  
Andrej Pustogow ◽  
Martin Dressel
Keyword(s):  
Superconducting State ◽  
Low Temperatures ◽  
Magnetic Order ◽  
Ambient Pressure ◽  
Mott Insulator ◽  
Quantum Spin ◽  
Spin Liquid ◽  
First Order ◽  
Insulator Metal Transition ◽  
Quantum Spin Liquid

The quantum spin liquid candidate κ-(BEDT-TTF)2Cu2(CN)3 has been established as the prime example of a genuine Mott insulator that can be tuned across the first-order insulator–metal transition either by chemical substitution or by physical pressure. Here, we explore the superconducting state that occurs at low temperatures, when both methods are combined, i.e., when κ-[(BEDT-TTF)1−x(BEDT-STF)x]2Cu2(CN)3 is pressurized. We discovered superconductivity for partial BEDT-STF substitution with x = 0.10–0.12 even at ambient pressure, i.e., a superconducting state is realized in the range between a metal and a Mott insulator without magnetic order. Furthermore, we observed the formation of a superconducting dome by pressurizing the substituted crystals; we assigned this novel behavior to disorder emanating from chemical tuning.

scholarly journals Chemical tuning of the molecular quantum materials κ-[(BEDT-TTF)1-x(BEDT-STF)x]2Cu2(CN)3: from Mott-insulating quantum spin liquid to metallic Fermi liquid

2021 ◽  
Author(s):  
Yohei Saito ◽  
Roland Rösslhuber ◽  
Anja Löhle ◽  
Miriam Sanz Alonso ◽  
Maxim Wenzel ◽  
...  
Keyword(s):  
Phase Transition ◽  
Electronic Properties ◽  
Fermi Liquid ◽  
Mott Insulator ◽  
Quantum Spin ◽  
Spin Liquid ◽  
Molecular Conductors ◽  
Chemical Pressure ◽  
Metal Phase Transition ◽  
Quantum Spin Liquid

The electronic properties of molecular conductors can be readily varied via physical or chemical pressure as it increases the bandwidth W; this enables crossing the Mott insulator-to-metal phase transition by...

scholarly journals Correlation holes and slow dynamics induced by fractional statistics in gapped quantum spin liquids

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Oliver Hart ◽  
Yuan Wan ◽  
Claudio Castelnovo
Keyword(s):  
Transport Properties ◽  
Realistic Model ◽  
Feedback Mechanism ◽  
Quantum Spin ◽  
Spin Liquid ◽  
Spin Liquids ◽  
Slow Dynamics ◽  
Temperature Dependent ◽  
Quantum Spin Liquids ◽  
Quantum Spin Liquid

AbstractRealistic model Hamiltonians for quantum spin liquids frequently exhibit a large separation of energy scales between their elementary excitations. At intermediate, experimentally relevant temperatures, some excitations are sparse and hop coherently, whereas others are thermally incoherent and dense. Here, we study the interplay of two such species of quasiparticle, dubbed spinons and visons, which are subject to nontrivial mutual statistics – one of the hallmarks of quantum spin liquid behaviour. Our results for $${{\mathbb{Z}}}_{2}$$ Z 2 quantum spin liquids show an intriguing feedback mechanism, akin to the Nagaoka effect, whereby spinons become localised on temperature-dependent patches of expelled visons. This phenomenon has important consequences for the thermodynamic and transport properties of the system, as well as for its response to quenches in temperature. We argue that these effects can be measured in experiments and may provide viable avenues for obtaining signatures of quantum spin liquid behaviour.

scholarly journals Gapless Quantum Spin Liquid in the Triangular System Sr3CuSb2O9

2020 ◽  
Vol 125 (26) ◽  
Author(s):  
S. Kundu ◽  
Aga Shahee ◽  
Atasi Chakraborty ◽  
K. M. Ranjith ◽  
B. Koo ◽  
...  
Keyword(s):  
Quantum Spin ◽  
Spin Liquid ◽  
Triangular System ◽  
Quantum Spin Liquid

scholarly journals Giant phonon anomalies in the proximate Kitaev quantum spin liquid α-RuCl3

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Haoxiang Li ◽  
T. T. Zhang ◽  
A. Said ◽  
G. Fabbris ◽  
D. G. Mazzone ◽  
...  
Keyword(s):  
Acoustic Phonon ◽  
Energy Scale ◽  
Quantum Spin ◽  
Majorana Fermion ◽  
Spin Liquid ◽  
Optical Phonons ◽  
Large Intensity ◽  
Topological Quantum ◽  
Topological State ◽  
Quantum Spin Liquid

AbstractThe Kitaev quantum spin liquid epitomizes an entangled topological state, for which two flavors of fractionalized low-energy excitations are predicted: the itinerant Majorana fermion and the Z2 gauge flux. It was proposed recently that fingerprints of fractional excitations are encoded in the phonon spectra of Kitaev quantum spin liquids through a novel fractional-excitation-phonon coupling. Here, we detect anomalous phonon effects in α-RuCl3 using inelastic X-ray scattering with meV resolution. At high temperature, we discover interlaced optical phonons intercepting a transverse acoustic phonon between 3 and 7 meV. Upon decreasing temperature, the optical phonons display a large intensity enhancement near the Kitaev energy, JK~8 meV, that coincides with a giant acoustic phonon softening near the Z2 gauge flux energy scale. These phonon anomalies signify the coupling of phonon and Kitaev magnetic excitations in α-RuCl3 and demonstrates a proof-of-principle method to detect anomalous excitations in topological quantum materials.

scholarly journals Signatures of a gearwheel quantum spin liquid in a spin- 12 pyrochlore molybdate Heisenberg antiferromagnet

2017 ◽  
Vol 1 (7) ◽  
Author(s):  
Yasir Iqbal ◽  
Tobias Müller ◽  
Kira Riedl ◽  
Johannes Reuther ◽  
Stephan Rachel ◽  
...  
Keyword(s):  
Quantum Spin ◽  
Spin Liquid ◽  
Heisenberg Antiferromagnet ◽  
Quantum Spin Liquid
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