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Field-Induced Quantum Criticality and Universal Temperature Dependence of the Magnetization of a Spin-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:math>Heisenberg Chain
Bibliographic Information
- Published
- 2015-01-22
- Resource Type
- journal article
- Rights Information
-
- http://link.aps.org/licenses/aps-default-license
- http://link.aps.org/licenses/aps-default-accepted-manuscript-license
- DOI
-
- 10.1103/physrevlett.114.037202
- Publisher
- American Physical Society (APS)
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Description
High-precision dc magnetization measurements have been made on Cu(C4H4N2) (NO3)2 in magnetic fields up to 14.7 T, slightly above the saturation field Hs=13.97 T, in the temperature range from 0.08 to 15 K. The magnetization curve and differential susceptibility at the lowest temperature show excellent agreement with exact theoretical results for the spin-1/2 Heisenberg antiferromagnet in one dimension. A broad peak is observed in magnetization measured as a function of temperature, signaling a crossover to a low-temperature Tomonaga-Luttinger-liquid regime. With an increasing field, the peak moves gradually to lower temperatures, compressing the regime, and, at Hs, the magnetization exhibits a strong upturn. This quantum critical behavior of the magnetization and that of the specific heat withstand quantitative tests against theory, demonstrating that the material is a practically perfect one-dimensional spin-1/2 Heisenberg antiferromagnet.
Journal
-
- Physical Review Letters
-
Physical Review Letters 114 (3), 037202-, 2015-01-22
American Physical Society (APS)
