Unusual Mott transition in multiferroic PbCrO 3

Wang, Shanmin; Zhu, Jinlong; Zhang, Yi; Yu, Xiaohui; Zhang, Jianzhong; Wang, Wendan; Bai, Ligang; Qian, Jiang; Yin, Liang; Sullivan, Neil S.; Jin, Changqing; He, Duanwei; Xu, Jian; Zhao, Yusheng

doi:10.1073/pnas.1510415112

Title: Unusual Mott transition in multiferroic PbCrO ₃

Journal Article · Tue Nov 24 00:00:00 EST 2015 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.1510415112· OSTI ID:1261490

Wang, Shanmin ^[1]; Zhu, Jinlong ^[2]; Zhang, Yi ^[3]; Yu, Xiaohui ^[4]; Zhang, Jianzhong ^[5]; Wang, Wendan ^[6]; Bai, Ligang ^[7]; Qian, Jiang ^[8]; Yin, Liang ^[9]; Sullivan, Neil S. ^[9]; Jin, Changqing ^[10]; He, Duanwei ^[6]; Xu, Jian ^[6]; Zhao, Yusheng ^[11]

Sichuan Univ., Chengdu (China); Univ. of Nevada, Las Vegas, NV (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Nevada, Las Vegas, NV (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Chinese Academy of Sciences (CAS), Beijing (China)
Univ. of Nevada, Las Vegas, NV (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Chinese Academy of Sciences (CAS), Beijing (China)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sichuan Univ., Chengdu (China)
Univ. of Nevada, Las Vegas, NV (United States); Carnegie Inst. of Washington, Argonne, IL (United States)
US Synthetic Corporation, Orem, UT (United States)
Univ. of Florida, Gainesville, FL (United States)
Chinese Academy of Sciences (CAS), Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
Univ. of Nevada, Las Vegas, NV (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

The Mott insulator in correlated electron systems arises from classical Coulomb repulsion between carriers to provide a powerful force for electron localization. Turning such an insulator into a metal, the so-called Mott transition, is commonly achieved by “bandwidth control or “band filling.” However, both mechanisms deviate fro the original concept of Mott, which attributes such a transition t the screening of Coulomb potential and associated lattice contraction Here, we report a pressure-induced isostructural Mott transition in cubic perovskite PbCrO₃. At the transition pressure of ~3 GPa, PbCrO₃ exhibits significant collapse in both lattice volum and Coulomb potential. Concurrent with the collapse, it transform from a hybrid multiferroic insulator to a metal. For the first time t our knowledge, these findings validate the scenario conceived b Mott. Close to the Mott criticality at ~300 K, fluctuations of the lattice and charge give rise to elastic anomalies and Laudau critical behaviors resembling the classic liquid–gas transition. In conclusion, the anomalously large lattice volume and Coulomb potential in the low-pressure insulating phase are largely associated with the ferroelectric distortion, which is substantially suppressed at high pressures, leading to the first-order phase transition without symmetry breaking.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Nevada, Las Vegas, NV (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC05-00OR22725; FC52-06NA27684; 2011CB808205; NA0001974; FG02-99ER45775; AC02-06CH11357; AC52-06NA25396; NA0001982

OSTI ID:: 1261490

Alternate ID(s):: OSTI ID: 1332356

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Vol. 112, Issue 50; ISSN 0027-8424

Publisher:: National Academy of Sciences, Washington, DC (United States)Copyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 16 works

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Breakdown of Hooke’s law of elasticity at the Mott critical endpoint in an organic conductor Gati, Elena; Garst, Markus; Manna, Rudra S. Science Advances, Vol. 2, Issue 12 https://doi.org/10.1126/sciadv.1601646	journal	December 2016
Synthesis of single-crystal perovskite PbCrO ₃ through a new reaction route at high pressure Han, Yunxia; Wang, Shanmin; Liu, Yinjuan High Pressure Research, Vol. 38, Issue 2 https://doi.org/10.1080/08957959.2018.1428319	journal	January 2018
Tracking a hysteretic and disorder-broadened phase transition via the electromagnon response in improper ferroelectrics Mosley, C. D. W.; Prabhakaran, D.; Lloyd-Hughes, J. Journal of Physics D: Applied Physics, Vol. 51, Issue 8 https://doi.org/10.1088/1361-6463/aaa836	journal	February 2018

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Title: Unusual Mott transition in multiferroic PbCrO 3

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Title: Unusual Mott transition in multiferroic PbCrO ₃