aqora

Fractional Excitation Induced Giant Phonon Anomalies in the Proximate Kitaev Quantum Spin Liquid a-RuCl3

Haoxiang Li, Tiantian Zhang, Ayman Said +10 more

Bulletin of the American Physical SocietyMar 16, 20210 citations

Dynamical properties of fractional excitations in Kitaev spin liquids

Masafumi Udagawa

Bulletin of the American Physical SocietyMar 13, 20170 citations

The Role of Quantum Metastability and the Perspective of Quantum Glassiness in Kitaev Fractional Spin Dynamics: An NMR Study

Wassilios Papawassiliou, Nicolas Lazaridis, Eunice Mumba Mpanga +8 more

The suppression of magnetic order and the detection of a half-quantized thermal Hall effect in α-RuCl3 under an external magnetic field have sparked significant debate, whether these phenomena point to spin fractionalization, as posited by the Kitaev quantum spin liquid (QSL) model, or if they arise from a more conventional mechanism in an antiferromagnetically ordered spin state. Here, through 23Na NMR relaxation measurements on the layered cobaltate Na2Co2TeO6 at two distinct magnetic fields (4.7 and 9.4 Tesla), we provide compelling evidence supporting a variant interpretation. While upon cooling, the NMR relaxation times align with the temperature dependence predicted by Kitaev fractional spin excitations, below 10 K, a dynamically heterogeneous state is detected with Quantum Spin Glass (QSG) characteristics. In this state, the spin fractionalization dynamics unfold over markedly different time scales, and are characterized by quantum metastability, inducing prolonged equilibration as T->0. This observation challenges the prevailing view of a primarily homogeneous QSL state, as the ground state of tangible Kitaev systems.The suppression of magnetic order and the detection of a half-quantized thermal Hall effect in α-RuCl3 under an external magnetic field have sparked significant debate, whether these phenomena point to spin fractionalization, as posited by the Kitaev quantum spin liquid (QSL) model, or if they arise from a more conventional mechanism in an antiferromagnetically ordered spin state. Here, through 23Na NMR relaxation measurements on the layered cobaltate Na2Co2TeO6 at two distinct magnetic fields (4.7 and 9.4 Tesla), we provide compelling evidence supporting a variant interpretation. While upon cooling, the NMR relaxation times align with the temperature dependence predicted by Kitaev fractional spin excitations, below 10 K, a dynamically heterogeneous state is detected with Quantum Spin Glass (QSG) characteristics. In this state, the spin fractionalization dynamics unfold over markedly different time scales, and are characterized by quantum metastability, inducing prolonged equilibration as T->0. This observation challenges the prevailing view of a primarily homogeneous QSL state, as the ground state of tangible Kitaev systems.

arXiv:2407.14663Jul 19, 20240 citations

Spin-Liquid–to–Spin-Liquid Transition in Kitaev Magnets Driven by Fractionalization

譲治那須, Joji Nasu, 幸年求 +7 more

Mar 1, 20170 citations

The Role of Quantum Metastability and the Perspective of Quantum Glassiness in Kitaev’s Fractional Spin Dynamics: An NMR Study

G. C. Papavassiliou, Wassilios Papawassiliou, Nicolas Lazaridis +8 more

Abstract The suppression of magnetic order and the detection of a half-quantized thermal Hall effect in α-RuCl3 under an external magnetic field have sparked significant debate, whether these phenomena point to spin fractionalization, as posited by the Kitaev quantum spin liquid (QSL) model, or if they arise from a more conventional mechanism in an antiferromagnetically ordered spin state. Here, through 23Na NMR relaxation measurements on the layered cobaltate Na2Co2TeO6 at two distinct magnetic fields (4.7 and 9.4 Tesla), we provide compelling evidence supporting a variant interpretation. While upon cooling, the NMR relaxation times align with the temperature dependence predicted by Kitaev’s fractional spin excitations, below 10 K, a dynamically heterogeneous state is detected with Quantum Spin Glass (QSG) characteristics. In this state, the spin fractionalization dynamics unfold over markedly different time scales, and are characterized by quantum metastability, inducing prolonged equilibration as T→0. This observation challenges the prevailing view of a primarily homogeneous QSL state, as the ground state of tangible Kitaev systems.Abstract The suppression of magnetic order and the detection of a half-quantized thermal Hall effect in α-RuCl3 under an external magnetic field have sparked significant debate, whether these phenomena point to spin fractionalization, as posited by the Kitaev quantum spin liquid (QSL) model, or if they arise from a more conventional mechanism in an antiferromagnetically ordered spin state. Here, through 23Na NMR relaxation measurements on the layered cobaltate Na2Co2TeO6 at two distinct magnetic fields (4.7 and 9.4 Tesla), we provide compelling evidence supporting a variant interpretation. While upon cooling, the NMR relaxation times align with the temperature dependence predicted by Kitaev’s fractional spin excitations, below 10 K, a dynamically heterogeneous state is detected with Quantum Spin Glass (QSG) characteristics. In this state, the spin fractionalization dynamics unfold over markedly different time scales, and are characterized by quantum metastability, inducing prolonged equilibration as T→0. This observation challenges the prevailing view of a primarily homogeneous QSL state, as the ground state of tangible Kitaev systems.

Oct 9, 20240 citations

Dynamics of Kitaev Spin Liquid under A Local Magnetic Field

Shuang Liang, Wei Chen

Bulletin of the American Physical SocietyMar 8, 20180 citations

NMR observation of field induced fractionalized spin excitations in the Kitaev spin liquid candidate

Related papers

NMR observation of field induced fractionalized spin excitations in the Kitaev spin liquid candidate

Related papers