Magnetic resonance in the antiferromagnetic and normal state of NH3K3C60

F. Simon, A. Jánossy, Ferenc Murányi, T. Fehér, Hideo Shimoda, Yoshihiro Iwasa, László Forró

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Abstract

We report on the magnetic resonance of NH3K3C60 powders in the frequency range 9-225 GHz. The observation of an antiferromagnetic resonance below the phase transition at 40 K is evidence for an antiferromagnetically ordered ground state. In the normal state, above 40 K, the temperature dependence of the spin susceptibilty measured by electron-spin resonance agrees with previous static measurements and is too weak to be explained by interacting localized spins in an insulator. The magnetic-resonance linewidth has an unusual magnetic-field dependence which is large and temperature independent in the magnetically ordered state and decreases rapidly above the transition. These observations agree with the suggestion that NH3K3C60 is a metal in the normal state and undergoes a Mott-Hubbard metal to insulator transition at 40 K.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume61
Issue number6
Publication statusPublished - Feb 1 2000

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Magnetic resonance
magnetic resonance
Metals
insulators
Linewidth
Powders
Ground state
Paramagnetic resonance
Phase transitions
Magnetic fields
metals
Temperature
suggestion
electron paramagnetic resonance
frequency ranges
temperature dependence
ground state
magnetic fields
temperature

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Magnetic resonance in the antiferromagnetic and normal state of NH3K3C60. / Simon, F.; Jánossy, A.; Murányi, Ferenc; Fehér, T.; Shimoda, Hideo; Iwasa, Yoshihiro; Forró, László.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 61, No. 6, 01.02.2000.

Research output: Contribution to journalArticle

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AU - Murányi, Ferenc

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AU - Iwasa, Yoshihiro

AU - Forró, László

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