有机导体PDMATHAAD（NMR）中PDMATHAAC交换场的$^{77}$测量$_{2}$ FeCl $_{4}$
$^{77}$Se NMR measurements of the $π-d$ exchange field in the organic conductor $λ-$(BETS)$_{2}$FeCl$_{4}$
摘要：
报道了有机导体$λ-$（BETS）小单晶的$^{77}$ Se-NMR谱和顺磁金属（PM）相和反铁磁绝缘（AFI）相的频移测量结果，它们是温度（$T$）和磁场取向（$B_{0}$ = 9 T）的函数。结果表明，在低$T$极限下，局域Fe $^{3+}$自旋（PDMATHAMT = 5/2）几乎完全极化，传导电子（Se $π$ -电子，自旋$s_π$ = 1/2）在BETS分子中经历交换场（$\bf{B}$ $_{πd}$），其在5 K和9 T下具有$-$ 32.7 $\pm$ 1.5 T的值，与$\bf{B}$ $_{0}$相反对齐。$\bf{B}$ $_{πd}$的这个大的负值与通过电阻率测量预测的一致，并且支持Jaccarino-Peter内部场补偿机制负责场诱导超导性的起源。
英文摘要：
$^{77}$Se-NMR spectrum and frequency shift measurements in the paramagnetic metal (PM) and antiferromagnetic insulating (AFI) phases are reported for a small single crystal of the organic conductor $λ-$(BETS)$_{2}$FeCl$_{4}$ as a function of temperature ($T$) and field alignment for an applied magnetic field $B_{0}$ = 9 T. The results show that in the low $T$ limit, where the localized Fe$^{3+}$ spins ($S_{d}$ = 5/2) are almost fully polarized, the conduction electrons (Se $π$-electrons, spin $s_π$ = 1/2) in the BETS molecules experience an exchange field ($\bf{B}$$_{πd}$) from the Fe$^{3+}$ spins with a value of $-$ 32.7 $\pm$ 1.5 T at 5 K and 9 T aligned opposite to $\bf{B}$$_{0}$. This large negative value of $\bf{B}$$_{πd}$ is consistent with that predicted by the resistivity measurements and supports the Jaccarino-Peter internal field-compensation mechanism being responsible for the origin of field-induced superconductivity.
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