一般 X-ray 檢測無法分辨 Bi2Se3及 Bi2-xMnxSe3的品質優劣，但我們從 NMR 頻譜的形狀和偏移位置可明確分辨其品質的好壞。除此之外在摻雜 Mn 後的 Bi2-xMnxSe3約在 50K 附近發生的磁性的相轉變到 20K 附近時有磁性的 short-range correlation 發生，且隨著 Mn 濃度的摻雜而越來越明顯。
由各濃度的 NMR 頻譜隨溫度變化所產生的額外 peak 的偏移與漲落，以及
1 T T 中受到摻雜 Mn 磁性影響的 Bi site 隨溫度的變化，都說明了 Bi 受到摻後磁1
性相轉變的影響。此相轉變現象並不能以一般簡單的鐵磁性相轉變或是反鐵磁性 相轉變來解釋，由頻譜與峰值的變化來看其中的相轉變過程極為複雜可能有多種 作用在其中，且發生 short-range correlation 的溫度附近與 spin-glass 有某種關聯 性。
46
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