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An NMR study of the spin chain systems copper pyrazine dinitrate and bisphenazinium copper tetrachloride

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This thesis presents a comprehensive nuclear magnetic resonance (NMR) examination of the magnetic ¿eld-driven quantum phase transitions (QPTs) in the metalorganic spin chain compounds copper pyrazine dinitrate (CuPzN) and bisphenazinium copper tetrachloride (PhnCuCl). Due to their relatively small magnetic exchange interaction energy J, the full magnetic phase diagrams of both sample systems could be accessed experimentally, i.e. in the parameter range from the low- (B « Bc) to the high-¿eld limit (B » Bc) and temperatures from the quantum regime (kBT « J) up to the classical regime (kBT ...