Properties of an organic model S=1 Haldane chain system

Jakovac, Ivan; Cvitanić, Tonči; Arčon, Denis; Herak, Mirta; Cinčić, Dominik; Topić, Nea Baus; Hosokoshi, Yuko; Ono, Toshio; Iwashita, Ken; Hayashi, Nobuyuki; Amaya, Naoki; Matsuo, Akira; Kindo, Koichi; Lončarić, Ivor; Horvatić, Mladen; Takigawa, Masashi; Grbić, Mihael S. (2025) Properties of an organic model S=1 Haldane chain system. Physical Review B, 111 . ISSN 2469-9950

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Abstract

We present the properties of an organic S = 1 antiferromagnetic chain system m-NO2PhBNO (abbreviated BoNO). In this biradical system, two unpaired electrons from aminoxyl groups are strongly ferromagnetically coupled (|JFM|/kB >= 500 K), which leads to the formation of an effective S = 1 state for each molecule. The chains of BoNO biradicals propagate along the crystallographic a axis. Temperature dependencies of the g factor and electron paramagnetic resonance (EPR) linewidth are consistent with a low-dimensional system with antiferromagnetic interactions. The EPR data further suggest that BoNO is a Haldane system with an almost isotropic g factor (2.0023 +/- 2 parts per thousand). The magnetization measurements in magnetic fields up to 40 T and low-field susceptibility, together with 1H nuclear magnetic resonance (NMR) spectra, reveal a dominant intrachain antiferromagnetic exchange coupling of J1D/kB = (11.3 +/- 0.1) K, and attainable critical magnetic fields of mu 0Hc1 2 T and mu 0Hc2 33 T. These measurements therefore suggest that BoNO is a rare example of a Haldane system with extremely small magnetic anisotropy. The present results are crucial for a future in-depth NMR study of the low-temperature Tomonaga-Luttinger liquid and magnetic field-induced phases, which can be performed in the entire phase space.

Item Type:	Article
Uncontrolled Keywords:	Haldane chain; quantum magnetizm; EPR; NMR; magnetization; DFT; organic; TLL
Subjects:	NATURAL SCIENCES NATURAL SCIENCES > Physics
Divisions:	Theoretical Physics Division
Projects:	Project title Project leader Project code Project type Mikroskopska istraživanja induciranih faza u jako koreliranim elektronskim sustavima-MicroS Miroslav Požek IP-2018-01-2970 HRZZ Centar za Napredna Istraživanja Kompleksnih Sustava-CeNIKS Mihael Srđan Grbić; Emil Tafra KK.01.1.1.02.0013 EK Kriogeni centar Instituta za fiziku-KaCIF Nikolina Novosel; Josip Buhin KK.01.1.1.02.0012 EK Osnovna stanja u kompeticiji – jake korelacije, frustracija i nered - FrustKor Damir Starešinić UNSPECIFIED UNSPECIFIED
Depositing User:	Kristina Ciglar
Date Deposited:	22 Apr 2025 08:22
URI:	http://fulir.irb.hr/id/eprint/9724
DOI:	10.1103/PhysRevB.111.064407

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