Journal of Magnetism and Magnetic Materials 290–291 (2005) 438–441 NMR in pulsed high magnetic fields at 1.3 GHz J. Haase a,Ã , M. Kozlov a , K.-H. Mu¨ller a , H. Siegel a , B. Bu¨ chner a , H. Eschrig a , A.G. Webb b a Leibniz Institute for Solid State and Materials Research Dresden, PF 27 01 16, Dresden D-01171, Germany b University of Illinois at Urbana-Champaign, Department of Electrical and Computer Engineering, Urbana, IL 61801, USA Available online 18 December 2004 Abstract Recently, the first nuclear magnetic resonance (NMR) experiments in pulsed high magnetic fields have been reported on low gyromagentic ratio, g; nuclei at moderate frequencies, below 400MHz. Since the uncertainty in producing a particular resonance frequency grows with large-g nuclei in high pulsed fields, it was not clear whether it will be possible to observe the corresponding resonances. Here, the first 1 H NMR experiments at 1.3GHz in pulsed high-field magnets are reported, showing that it is indeed possible to perform such experiments. r 2004 Elsevier B.V. All rights reserved. PACS: 67.80.Jd; 82.56.b Keywords: Nuclear magnetic resonance; Pulsed magnetic fields 1. Introduction Magnetic fields are an important tool in materials research, and nuclear magnetic resonance (NMR) is one of the most versatile spectroscopic methods [1].InNMR the magnetic field influences the static nuclear Zeeman interaction, and the field can serve as an external tuning parameter to study material properties [2]. In general, high magnetic fields are beneficial for NMR since high fields boost sensitivity and resolution. Therefore, NMR has a prime interest in high magnetic fields. While the highest magnetic fields can be achieved with pulsed magnets [3–5] NMR experiments in such magnets were only reported very recently [6]. Given the inherently low NMR sensitivity and the need for high homogeneity across the sample volume, NMR is preferably performed in static magnets. Static magnet technology is currently limited to about 22 T for persistent mode superconducting magnets [7,8] and to about 33T for electromagnets [9]. Rare hybrids of non- persistent superconducting magnets with embedded electromagnets can reach about 45T [7]. Further increases in the field strength are unlikely given the tremendous costs of construction and operation. With non-persistent or electromagnets the beneficial field stability provided by the persistent-mode superconduc- tors is lost, which results in the degradation of NMR resolution [10]. Since pulsed magnets require small main coils [3] the field’s homogeneity is lower. In addition, since the magnetic field is strongly time-dependent it is not surprising that pulsed magnets have not been of prime interest to NMR spectroscopists. Recently, it has been shown [11] that NMR experi- ments are not only possible, but that the broadening of the NMR lines caused by the time dependence of the field (frequency modulation of the signal) can be ARTICLE IN PRESS www.elsevier.com/locate/jmmm 0304-8853/$-see front matter r 2004 Elsevier B.V. All rights reserved. doi:10.1016/j.jmmm.2004.11.494 Ã Corresponding author. Tel.: +493514659524; fax: +493514659313. E-mail address: j.haase@ifw-dresden.de (J. Haase).