Field-induced anisotropy in the quasi-two-dimensional weakly anisotropic antiferromagnet [ CuCl ( pyz ) 2 ] BF 4

Kwon, Sungmin; Jeong, M.; Kubus, Mariusz; Wehinger, B.; Krämer, Karl; Rüegg, Ch.; Rønnow, H. M.; Lee, Soonchil (2019). Field-induced anisotropy in the quasi-two-dimensional weakly anisotropic antiferromagnet [ CuCl ( pyz ) 2 ] BF 4. Physical review. B - condensed matter and materials physics, 99(21) American Physical Society 10.1103/PhysRevB.99.214403

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We measured NMR and magnetic susceptibility for the quasi-two-dimensional, weakly XY-like, spin-1/2 square-lattice Heisenberg antiferromagnet [CuCl(pyz)2]BF4 (pyz = pyrazine =N2C4H4) near the critical temperature. The Néel temperature TN and the order-parameter critical exponent β were obtained from the NMR line broadening as a function of temperature. As the applied field strength (H∥c) was increased, TN increased and β decreased. This behavior indicates that the field effectively enhanced XY anisotropy. The susceptibility as a function of temperature did not show a clear feature for TN, but showed field-dependent minima below TN for both H∥c and H∥ab, where minimum features disappeared for μ0H>2T.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP)

UniBE Contributor:

Kubus, Mariusz and Krämer, Karl

Subjects:

500 Science > 530 Physics
500 Science > 540 Chemistry

ISSN:

1098-0121

Publisher:

American Physical Society

Funders:

[42] Schweizerischer Nationalfonds

Language:

English

Submitter:

Karl Krämer

Date Deposited:

02 Sep 2019 09:35

Last Modified:

26 Oct 2019 07:58

Publisher DOI:

10.1103/PhysRevB.99.214403

BORIS DOI:

10.7892/boris.132839

URI:

https://boris.unibe.ch/id/eprint/132839

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