Truncated mass divergence in a Mott metal.
Truncated mass divergence in a Mott metal.
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DOI：
10.1073/pnas.2301456120
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发表时间：
2023-09-19
影响因子：
11.1
通讯作者：
Grosche, F. Malte
中科院分区：
文献类型：
--
作者：
Semeniuk, Konstantin;Chang, Hui;Baglo, Jordan;Friedemann, Sven;Tozer, Stanley W.;Coniglio, William A.;Gamza, Monika B.;Reiss, Pascal;Alireza, Patricia;Leermakers, Inge;McCollam, Alix;Grockowiak, Audrey D.;Grosche, F. Malte
金属中的强排斥相互作用可以导致电子栅锁，产生莫特绝缘体。在这种莫特局域化边缘的强关联金属态与凝聚态研究中一些最具挑战性的涌现现象有关。这项研究跟踪电子电荷载流子的浓度和速度在一个干净的三维材料调整到莫特绝缘状态施加压力。我们的研究结果表明，随着莫特转变的接近，载流子的速度急剧减慢，实验证实了Brinkman-Rice对相关莫特金属的描述，这是五十多年前首次提出的。这些发现为研究更复杂的材料提供了信息，如铜酸盐，有机和铁基超导体，莫尔超晶格系统和近藤晶格材料。莫特金属-绝缘体转变是凝聚态物理中最基本的现象之一。然而，莫特局域化的规范Brinkman-Rice图像的基本原则仍然需要通过直接探测准粒子费米面和有效质量的量子振荡测量来进行实验测试。通过将这种技术扩展到高压，我们已经研究了金属状态的阈值Mott本地化在清洁，未掺杂的晶体NiS 2。我们发现：（1）在接近Mott局域化时，准粒子质量大大增加，而费米面基本保持不变;（2）准粒子质量与理论预测的发散形式密切相关，表明载流子减速是金属-绝缘体相变的驱动因素; iii）这种质量发散被金属-绝缘体转变截断，将莫特临界点置于相图的绝缘部分内。Mott临界点在NiS 2中的不可及性与清洁金属系统中铁磁性阈值的发现相似，其中低温临界性几乎普遍被一阶跃迁或新出现的阶段（如无公度磁序或非常规超导性）打断。
Strong repulsive interactions in metals can cause electronic grid-lock, producing a Mott insulator. The strongly correlated metallic state on the brink of such Mott localization is associated with some of the most challenging emergent phenomena in condensed matter research. This study tracks the electronic charge carrier concentration and velocity in a clean three-dimensional material tuned toward the Mott insulating state by applied pressure. Our results show that carriers slow down dramatically as the Mott transition is approached, confirming experimentally the Brinkman–Rice description of the correlated Mott metal, first articulated more than fifty years ago. These findings inform the study of more complex materials such as cuprate, organic, and iron-based superconductors, Moiré superlattice systems, and Kondo lattice materials. The Mott metal–insulator transition represents one of the most fundamental phenomena in condensed matter physics. Yet, basic tenets of the canonical Brinkman-Rice picture of Mott localization remain to be tested experimentally by quantum oscillation measurements that directly probe the quasiparticle Fermi surface and effective mass. By extending this technique to high pressure, we have examined the metallic state on the threshold of Mott localization in clean, undoped crystals of NiS2. We find that i) on approaching Mott localization, the quasiparticle mass is strongly enhanced, whereas the Fermi surface remains essentially unchanged; ii) the quasiparticle mass closely follows the divergent form predicted theoretically, establishing charge carrier slowdown as the driver for the metal–insulator transition; iii) this mass divergence is truncated by the metal–insulator transition, placing the Mott critical point inside the insulating section of the phase diagram. The inaccessibility of the Mott critical point in NiS2 parallels findings at the threshold of ferromagnetism in clean metallic systems, in which criticality at low temperature is almost universally interrupted by first-order transitions or novel emergent phases such as incommensurate magnetic order or unconventional superconductivity.
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影响因子：
8.6
作者：
FUJIMORI, A;HASE, I;DEGROOT, FMF
通讯作者：
DEGROOT, FMF
影响因子：
8.6
作者：
INOUE, IH;HASE, I;NISHIHARA, Y
通讯作者：
NISHIHARA, Y
DOI：
10.1098/rspa.1963.0204
发表时间：
1963-01-01
影响因子：
--
作者：
HUBBARD, J
通讯作者：
HUBBARD, J
影响因子：
16.6
作者：
Jang BG;Han G;Park I;Kim D;Koh YY;Kim Y;Kyung W;Kim HD;Cheng CM;Tsuei KD;Lee KD;Hur N;Shim JH;Kim C;Kotliar G
通讯作者：
Kotliar G
影响因子：
2
作者：
Graf, D. E.;Stillwell, R. L.;Tozer, S. W.
通讯作者：
Tozer, S. W.