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Deprecated: Implicit conversion from float 235.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Nat+Commun 2016 ; 7 (ä): ä Nephropedia Template TP
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Volume-wise destruction of the antiferromagnetic Mott insulating state through quantum tuning #MMPMID27531192
Frandsen BA; Liu L; Cheung SC; Guguchia Z; Khasanov R; Morenzoni E; Munsie TJS; Hallas AM; Wilson MN; Cai Y; Luke GM; Chen B; Li W; Jin C; Ding C; Guo S; Ning F; Ito TU; Higemoto W; Billinge SJL; Sakamoto S; Fujimori A; Murakami T; Kageyama H; Alonso JA; Kotliar G; Imada M; Uemura YJ
Nat Commun 2016[]; 7 (ä): ä PMID27531192show ga
RENiO3 (RE=rare-earth element) and V2O3 are archetypal Mott insulator systems. When tuned by chemical substitution (RENiO3) or pressure (V2O3), they exhibit a quantum phase transition (QPT) between an antiferromagnetic Mott insulating state and a paramagnetic metallic state. Because novel physics often appears near a Mott QPT, the details of this transition, such as whether it is first or second order, are important. Here, we demonstrate through muon spin relaxation/rotation (?SR) experiments that the QPT in RENiO3 and V2O3 is first order: the magnetically ordered volume fraction decreases to zero at the QPT, resulting in a broad region of intrinsic phase separation, while the ordered magnetic moment retains its full value until it is suddenly destroyed at the QPT. These findings bring to light a surprising universality of the pressure-driven Mott transition, revealing the importance of phase separation and calling for further investigation into the nature of quantum fluctuations underlying the transition.