Quantum criticality among entangled spin chains

Blanc, N.; Trinh, J.; Dong, L.; Bai, X.; Aczel, Adam A.; Mourigal, Martin P.; Balents, L.; Siegrist, T.; Ramirez, A. P.

doi:10.1038/s41567-017-0010-y

Quantum criticality among entangled spin chains

Journal Article · Mon Dec 11 00:00:00 EST 2017 · Nature Physics

DOI:https://doi.org/10.1038/s41567-017-0010-y· OSTI ID:1435334

Blanc, N. ^[1]; Trinh, J. ^[1]; Dong, L. ^[2]; Bai, X. ^[3]; ^[4]; ^[3]; Balents, L. ^[5]; Siegrist, T. ^[2]; ^[1]

Univ. of California, Santa Cruz, CA (United States)
FAMU-FSU College of Engineering, Tallahassee, FL (United States); National High Magnetic Field Lab., Tallahassee, FL (United States)
Georgia Inst. of Technology, Atlanta, GA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of California, Santa Barbara, CA (United States)

Here, an important challenge in magnetism is the unambiguous identification of a quantum spin liquid, of potential importance for quantum computing. In such a material, the magnetic spins should be fluctuating in the quantum regime, instead of frozen in a classical long-range-ordered state. While this requirement dictates systems wherein classical order is suppressed by a frustrating lattice, an ideal system would allow tuning of quantum fluctuations by an external parameter. Conventional three-dimensional antiferromagnets can be tuned through a quantum critical point—a region of highly fluctuating spins—by an applied magnetic field. Such systems suffer from a weak specific-heat peak at the quantum critical point, with little entropy available for quantum fluctuations. Here we study a different type of antiferromagnet, comprised of weakly coupled antiferromagnetic spin-1/2 chains as realized in the molecular salt K₂PbCu(NO₂)₆. Across the temperature–magnetic field boundary between three-dimensional order and the paramagnetic phase, the specific heat exhibits a large peak whose magnitude approaches a value suggestive of the spinon Sommerfeld coefficient of isolated quantum spin chains. These results demonstrate an alternative approach for producing quantum matter via a magnetic-field-induced shift of entropy from one-dimensional short-range order to a three-dimensional quantum critical point.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1435334

Journal Information:: Nature Physics, Journal Name: Nature Physics Journal Issue: 3 Vol. 14; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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Tomonaga–Luttinger liquid behavior and spinon confinement in YbAlO3 Wu, L. S.; Nikitin, S. E.; Wang, Z. Nature Communications, Vol. 10, Issue 1 https://doi.org/10.1038/s41467-019-08485-7	journal	February 2019
Quantum criticality and entropy transfer in spin chains and planes—Pyridine oxide copper salts Trinh, Jennifer; Schaller, Daniel; LaBarre, Patrick G. AIP Advances, Vol. 9, Issue 12 https://doi.org/10.1063/1.5130403	journal	December 2019
Magnetic field-driven quantum criticality in antiferromagnetic CePtIn ₄ Das, Debarchan; Gnida, Daniel; Wiśniewski, Piotr Proceedings of the National Academy of Sciences, Vol. 116, Issue 41 https://doi.org/10.1073/pnas.1910293116	journal	September 2019
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Interplay of Spin and Spatial Anisotropy in Low-Dimensional Quantum Magnets with Spin 1/2 Orendáčová, Alžbeta; Tarasenko, Róbert; Tkáč, Vladimír Crystals, Vol. 9, Issue 1 https://doi.org/10.3390/cryst9010006	journal	December 2018
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Exact dynamics of concurrence-based entanglement in a system of four spin-1/2 particles on a triangular ladder structure Shahsavari, Sajedeh; Motamedifar, Mostafa; Safari, Hassan arXiv https://doi.org/10.48550/arxiv.2006.10381	text	January 2020

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