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Measurements of the $^{1}$H-NMR spectrum of a small ($\sim$ 4 $\mu$g) singlecrystal of the organic conductor $\lambda$-(BETS)$_{2}$FeCl$_{4}$ are reportedwith an applied magnetic field $\bf{B}$$_{0}$ = 9 T parallel to the a-axis inthe $ac$-plane over a temperature $(T)$ range 2.0 $-$ 180 K. They provide thedistribution of the static local magnetic field at the proton sites in theparamagnetic metal (PM) and antiferromagnetic insulator (AFI) phases, alongwith the changes that occur at the PM$-$AFI phase transition. The spectra havesix main peaks that are significantly broadened and shifted at low $T$. Theorigin of these features is attributed to the large dipolar field from the 3dFe$^{3+}$ ion moments (spin $S_{\rm{d}}$ = 5/2). Their amplitude and$T-$dependence are modeled using a modified Brillouin function that includes amean field approximation for the total exchange interaction ($J_{0}$) betweenone Fe$^{3+}$ ion and its two nearest neighbors. A good fit is obtained using$J_{0}$ = $-$ 1.7 K. At temperatures below the PM$-$AFI transition temperature$T_{MI}$ = 3.5 K, an extra peak appears on the high frequency side of thespectrum and the details of the spectrum become smeared. Also, the rmslinewidth and the frequency shift of the spectral distribution arediscontinuous, consistent with the transition being first-order. Thesemeasurements verify that the dominant local magnetic field contribution is fromthe Fe$^{3+}$ ions and indicate that there is a significant change in thestatic local magnetic field distribution at the proton sites on traversing thePM to AFI phase transition.Comment: 11 pages, 7 figures. Revised version of cond-mat/0605044 resubmitted  to Phys. Rev. B in response to comments of Editor and reviewer

physical review. b, condensed matter and materials physics

Proton NMR measurements of the local magnetic field in the paramagnetic metal and antiferromagnetic insulator phases of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>λ</mml:mi><mml:mtext>−</mml:mtext><mml:mo>(</mml:mo><mml:mi>BETS</mml:mi><mml:msub><mml:mo>)</mml:mo><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>FeCl</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>

Proton NMR measurements of the local magnetic field in the paramagnetic metal and antiferromagnetic insulator phases ofλ−(BETS)2FeCl4