1
|
Yu TL, Xu M, Yang WT, Song YH, Wen CHP, Yao Q, Lou X, Zhang T, Li W, Wei XY, Bao JK, Cao GH, Dudin P, Denlinger JD, Strocov VN, Peng R, Xu HC, Feng DL. Strong band renormalization and emergent ferromagnetism induced by electron-antiferromagnetic-magnon coupling. Nat Commun 2022; 13:6560. [PMID: 36323685 PMCID: PMC9630309 DOI: 10.1038/s41467-022-34254-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Accepted: 10/13/2022] [Indexed: 11/15/2022] Open
Abstract
The interactions between electrons and antiferromagnetic magnons (AFMMs) are important for a large class of correlated materials. For example, they are the most plausible pairing glues in high-temperature superconductors, such as cuprates and iron-based superconductors. However, unlike electron-phonon interactions (EPIs), clear-cut observations regarding how electron-AFMM interactions (EAIs) affect the band structure are still lacking. Consequently, critical information on the EAIs, such as its strength and doping dependence, remains elusive. Here we directly observe that EAIs induce a kink structure in the band dispersion of Ba1-xKxMn2As2, and subsequently unveil several key characteristics of EAIs. We found that the coupling constant of EAIs can be as large as 5.4, and it shows strong doping dependence and temperature dependence, all in stark contrast to the behaviors of EPIs. The colossal renormalization of electron bands by EAIs enhances the density of states at Fermi energy, which is likely driving the emergent ferromagnetic state in Ba1-xKxMn2As2 through a Stoner-like mechanism with mixed itinerant-local character. Our results expand the current knowledge of EAIs, which may facilitate the further understanding of many correlated materials where EAIs play a critical role.
Collapse
Affiliation(s)
- T. L. Yu
- grid.8547.e0000 0001 0125 2443Laboratory of Advanced Materials, State Key Laboratory of Surface Physics and Department of Physics, Fudan University, 200438 Shanghai, P. R. China
| | - M. Xu
- grid.8547.e0000 0001 0125 2443Laboratory of Advanced Materials, State Key Laboratory of Surface Physics and Department of Physics, Fudan University, 200438 Shanghai, P. R. China
| | - W. T. Yang
- grid.8547.e0000 0001 0125 2443Laboratory of Advanced Materials, State Key Laboratory of Surface Physics and Department of Physics, Fudan University, 200438 Shanghai, P. R. China
| | - Y. H. Song
- grid.8547.e0000 0001 0125 2443Laboratory of Advanced Materials, State Key Laboratory of Surface Physics and Department of Physics, Fudan University, 200438 Shanghai, P. R. China
| | - C. H. P. Wen
- grid.8547.e0000 0001 0125 2443Laboratory of Advanced Materials, State Key Laboratory of Surface Physics and Department of Physics, Fudan University, 200438 Shanghai, P. R. China
| | - Q. Yao
- grid.8547.e0000 0001 0125 2443Laboratory of Advanced Materials, State Key Laboratory of Surface Physics and Department of Physics, Fudan University, 200438 Shanghai, P. R. China
| | - X. Lou
- grid.8547.e0000 0001 0125 2443Laboratory of Advanced Materials, State Key Laboratory of Surface Physics and Department of Physics, Fudan University, 200438 Shanghai, P. R. China
| | - T. Zhang
- grid.8547.e0000 0001 0125 2443Laboratory of Advanced Materials, State Key Laboratory of Surface Physics and Department of Physics, Fudan University, 200438 Shanghai, P. R. China ,grid.9227.e0000000119573309Shanghai Research Center for Quantum Sciences, 201315 Shanghai, P. R. China ,grid.509497.6Collaborative Innovation Center of Advanced Microstructures, 210093 Nanjing, China
| | - W. Li
- grid.8547.e0000 0001 0125 2443Laboratory of Advanced Materials, State Key Laboratory of Surface Physics and Department of Physics, Fudan University, 200438 Shanghai, P. R. China
| | - X. Y. Wei
- grid.8547.e0000 0001 0125 2443Laboratory of Advanced Materials, State Key Laboratory of Surface Physics and Department of Physics, Fudan University, 200438 Shanghai, P. R. China
| | - J. K. Bao
- grid.13402.340000 0004 1759 700XDepartment of Physics, Zhejiang University, 310027 Hangzhou, P. R. China
| | - G. H. Cao
- grid.13402.340000 0004 1759 700XDepartment of Physics, Zhejiang University, 310027 Hangzhou, P. R. China
| | - P. Dudin
- grid.18785.330000 0004 1764 0696Diamond Light Source, Harwell Science and Innovation Campus, Didcot, OX11 0DE UK
| | - J. D. Denlinger
- grid.184769.50000 0001 2231 4551Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720-8229 USA
| | - V. N. Strocov
- grid.5991.40000 0001 1090 7501Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, PSI Switzerland
| | - R. Peng
- grid.8547.e0000 0001 0125 2443Laboratory of Advanced Materials, State Key Laboratory of Surface Physics and Department of Physics, Fudan University, 200438 Shanghai, P. R. China ,grid.9227.e0000000119573309Shanghai Research Center for Quantum Sciences, 201315 Shanghai, P. R. China
| | - H. C. Xu
- grid.8547.e0000 0001 0125 2443Laboratory of Advanced Materials, State Key Laboratory of Surface Physics and Department of Physics, Fudan University, 200438 Shanghai, P. R. China
| | - D. L. Feng
- grid.8547.e0000 0001 0125 2443Laboratory of Advanced Materials, State Key Laboratory of Surface Physics and Department of Physics, Fudan University, 200438 Shanghai, P. R. China ,grid.9227.e0000000119573309Shanghai Research Center for Quantum Sciences, 201315 Shanghai, P. R. China ,grid.509497.6Collaborative Innovation Center of Advanced Microstructures, 210093 Nanjing, China ,grid.59053.3a0000000121679639Hefei National Laboratory for Physical Science at Microscale, CAS Center for Excellence in Quantum Information and Quantum Physics, and Department of Physics, University of Science and Technology of China, 230026 Hefei, P. R. China
| |
Collapse
|
2
|
Li B, Wu S, Wang Z, Wang C, Cao G. Synthesis, Structure and Properties of Layered Phosphide Nitrides
Ak
Th
2
Mn
4
P
4
N
2
(
Ak
= Rb, Cs)
†. CHINESE J CHEM 2021. [DOI: 10.1002/cjoc.202100341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Bai‐Zhuo Li
- Department of Physics, Zhejiang Province Key Laboratory of Quantum Technology and Devices, Interdisciplinary Center for Quantum Information, and State Key Lab of Silicon Materials Zhejiang University Hangzhou Zhejiang 310027 China
| | - Si‐Qi Wu
- Department of Physics, Zhejiang Province Key Laboratory of Quantum Technology and Devices, Interdisciplinary Center for Quantum Information, and State Key Lab of Silicon Materials Zhejiang University Hangzhou Zhejiang 310027 China
| | - Zhi‐Cheng Wang
- Department of Physics, Zhejiang Province Key Laboratory of Quantum Technology and Devices, Interdisciplinary Center for Quantum Information, and State Key Lab of Silicon Materials Zhejiang University Hangzhou Zhejiang 310027 China
| | - Cao Wang
- School of Physics & Optoelectronic Engineering Shandong University of Technology Zibo Shandong 255000 China
| | - Guang‐Han Cao
- Department of Physics, Zhejiang Province Key Laboratory of Quantum Technology and Devices, Interdisciplinary Center for Quantum Information, and State Key Lab of Silicon Materials Zhejiang University Hangzhou Zhejiang 310027 China
- Collaborative Innovation Centre of Advanced Microstructures Nanjing University Nanjing Jiangsu 210093 China
| |
Collapse
|
3
|
Pakhira S, Sangeetha NS, Smetana V, Mudring AV, Johnston DC. Short-range ferromagnetic order due to Ir substitutions in single-crystalline Ba(Co 1- x Ir x ) 2As 2 (0 ⩽ x ⩽ 0.25). JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 33:115802. [PMID: 33377475 DOI: 10.1088/1361-648x/abd339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The ternary-arsenide compound BaCo2As2 was previously proposed to be in proximity to a quantum-critical point where long-range ferromagnetic (FM) order is suppressed by quantum fluctuations. Here we report the effect of Ir substitutions for Co on the magnetic and thermal properties of Ba[Formula: see text] (0 ⩽ x ⩽ 0.25) single crystals. These compositions all crystallize in an uncollapsed body-centered-tetragonal ThCr2Si2 structure with space group I4/mmm. Magnetic susceptibility measurements reveal clear signatures of short-range FM ordering for x ⩾ 0.11 below a nearly composition-independent characteristic temperature T cl ≈ 13 K. The small variation of T cl with x, thermomagnetic irreversibility between zero-field-cooled and field-cooled magnetic susceptibility versus T, the occurrence of hysteresis in magnetization versus field isotherms at low field and temperature, and very small spontaneous and remanent magnetizations <0.01 μ B/f.u. together indicate that the FM response arises from short-range FM ordering of FM spin clusters as previously inferred to occur in Ca(Co1-x Ir x )2-y As2. Heat-capacity C p(T) data do not exhibit any clear feature around T cl, consistent with the very small moments of the FM clusters. The C p(T) in the paramagnetic temperature regime 25-300 K is well described by the sum of a Sommerfeld electronic contribution and Debye and Einstein lattice contributions where the latter lattice contribution suggests the presence of low-frequency optic modes associated with the heavy Ba atoms in the crystals.
Collapse
Affiliation(s)
- Santanu Pakhira
- Ames Laboratory, Iowa State University, Ames, Iowa 50011, United States of America
| | | | | | | | | |
Collapse
|
4
|
Rodrigues JNB, Wagner LK. Identifying materials with charge-spin physics using charge-spin susceptibility computed from first principles. J Chem Phys 2020; 153:074105. [PMID: 32828081 DOI: 10.1063/1.5144911] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The authors present a quantity termed charge-spin susceptibility, which measures the charge response to spin degrees of freedom in strongly correlated materials. This quantity is simple to evaluate using both standard density functional theory and many-body electronic structure techniques, enabling comparison between different levels of theory. A benchmark on 28 layered magnetic materials shows that large values of charge-spin susceptibility correlate with unconventional ground states such as disordered magnets and unconventional superconductivity.
Collapse
Affiliation(s)
- J N B Rodrigues
- Department of Physics and Institute for Condensed Matter Theory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - Lucas K Wagner
- Department of Physics and Institute for Condensed Matter Theory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| |
Collapse
|
5
|
Pandey A, Samal SL, Johnston DC. CsMn4As3: A Layered Tetragonal Transition-Metal Pnictide Compound with an Antiferromagnetic Ground State. Inorg Chem 2018; 57:3206-3214. [DOI: 10.1021/acs.inorgchem.7b03105] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Abhishek Pandey
- Ames Laboratory-USDOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, United States
| | - Saroj L. Samal
- Ames Laboratory-USDOE and Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - David C. Johnston
- Ames Laboratory-USDOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, United States
| |
Collapse
|
6
|
Ueland BG, Pandey A, Lee Y, Sapkota A, Choi Y, Haskel D, Rosenberg RA, Lang JC, Harmon BN, Johnston DC, Kreyssig A, Goldman AI. Itinerant ferromagnetism in the As 4p conduction band of Ba_{0.6}K_{0.4}Mn_{2}As_{2} identified by X-ray magnetic circular dichroism. PHYSICAL REVIEW LETTERS 2015; 114:217001. [PMID: 26066451 DOI: 10.1103/physrevlett.114.217001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2014] [Indexed: 06/04/2023]
Abstract
X-ray magnetic circular dichroism (XMCD) measurements on single-crystal and powder samples of Ba_{0.6}K_{0.4}Mn_{2}As_{2} show that the ferromagnetism below T_{C}≈100 K arises in the As 4p conduction band. No XMCD signal is observed at the Mn x-ray absorption edges. Below T_{C}, however, a clear XMCD signal is found at the As K edge which increases with decreasing temperature. The XMCD signal is absent in data taken with the beam directed parallel to the crystallographic c axis indicating that the orbital magnetic moment lies in the basal plane of the tetragonal lattice. These results show that the previously reported itinerant ferromagnetism is associated with the As 4p conduction band and that distinct local-moment antiferromagnetism and itinerant ferromagnetism with perpendicular easy axes coexist in this compound at low temperature.
Collapse
Affiliation(s)
- B G Ueland
- Ames Laboratory, U.S. Department of Energy, Iowa State University, Ames, Iowa 50011, USA
- Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
| | - Abhishek Pandey
- Ames Laboratory, U.S. Department of Energy, Iowa State University, Ames, Iowa 50011, USA
- Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
| | - Y Lee
- Ames Laboratory, U.S. Department of Energy, Iowa State University, Ames, Iowa 50011, USA
- Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
| | - A Sapkota
- Ames Laboratory, U.S. Department of Energy, Iowa State University, Ames, Iowa 50011, USA
- Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
| | - Y Choi
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - D Haskel
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - R A Rosenberg
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - J C Lang
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - B N Harmon
- Ames Laboratory, U.S. Department of Energy, Iowa State University, Ames, Iowa 50011, USA
- Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
| | - D C Johnston
- Ames Laboratory, U.S. Department of Energy, Iowa State University, Ames, Iowa 50011, USA
- Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
| | - A Kreyssig
- Ames Laboratory, U.S. Department of Energy, Iowa State University, Ames, Iowa 50011, USA
- Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
| | - A I Goldman
- Ames Laboratory, U.S. Department of Energy, Iowa State University, Ames, Iowa 50011, USA
- Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
| |
Collapse
|
7
|
Gu D, Dai X, Le C, Sun L, Wu Q, Saparov B, Guo J, Gao P, Zhang S, Zhou Y, Zhang C, Jin S, Xiong L, Li R, Li Y, Li X, Liu J, Sefat AS, Hu J, Zhao Z. Robust antiferromagnetism preventing superconductivity in pressurized (Ba 0.61 K 0.39)Mn2Bi2. Sci Rep 2014; 4:7342. [PMID: 25475224 PMCID: PMC4256658 DOI: 10.1038/srep07342] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2014] [Accepted: 11/17/2014] [Indexed: 11/09/2022] Open
Abstract
BaMn2Bi2 possesses an iso-structure of iron pnictide superconductors and similar antiferromagnetic (AFM) ground state to that of cuprates, therefore, it receives much more attention on its properties and is expected to be the parent compound of a new family of superconductors. When doped with potassium (K), BaMn2Bi2 undergoes a transition from an AFM insulator to an AFM metal. Consequently, it is of great interest to suppress the AFM order in the K-doped BaMn2Bi2 with the aim of exploring the potential superconductivity. Here, we report that external pressure up to 35.6 GPa cannot suppress the AFM order in the K-doped BaMn2Bi2 to develop superconductivity in the temperature range of 300 K-1.5 K, but induces a tetragonal (T) to an orthorhombic (OR) phase transition at ~20 GPa. Theoretical calculations for the T and OR phases, on basis of our high-pressure XRD data, indicate that the AFM order is robust in the pressurized Ba0.61K0.39Mn2Bi2. Both of our experimental and theoretical results suggest that the robust AFM order essentially prevents the emergence of superconductivity.
Collapse
Affiliation(s)
- Dachun Gu
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Xia Dai
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Congcong Le
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Liling Sun
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
- Collaborative Innovation Center of Quantum Matter, Beijing. 100190, China
| | - Qi Wu
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Bayrammurad Saparov
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 73831-6056, USA
| | - Jing Guo
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Peiwen Gao
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Shan Zhang
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Yazhou Zhou
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Chao Zhang
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Shifeng Jin
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Lun Xiong
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Rui Li
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Yanchun Li
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Xiaodong Li
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Jing Liu
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Athena S. Sefat
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 73831-6056, USA
| | - Jiangping Hu
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
- Collaborative Innovation Center of Quantum Matter, Beijing. 100190, China
| | - Zhongxian Zhao
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
- Collaborative Innovation Center of Quantum Matter, Beijing. 100190, China
| |
Collapse
|
8
|
Ferromagnetism at 230 K in (Ba0.7K0.3)(Zn0.85Mn0.15)2As2 diluted magnetic semiconductor. ACTA ACUST UNITED AC 2014. [DOI: 10.1007/s11434-014-0398-z] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
9
|
Saparov B, Sefat AS. Crystals, magnetic and electronic properties of a new ThCr2Si2-type BaMn2Bi2 and K-doped compositions. J SOLID STATE CHEM 2013. [DOI: 10.1016/j.jssc.2013.05.010] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
10
|
Pandey A, Ueland BG, Yeninas S, Kreyssig A, Sapkota A, Zhao Y, Helton JS, Lynn JW, McQueeney RJ, Furukawa Y, Goldman AI, Johnston DC. Coexistence of half-metallic itinerant ferromagnetism with local-moment antiferromagnetism in Ba0.60K0.40Mn2As2. PHYSICAL REVIEW LETTERS 2013; 111:047001. [PMID: 23931395 DOI: 10.1103/physrevlett.111.047001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2013] [Indexed: 06/02/2023]
Abstract
Magnetization, nuclear magnetic resonance, high-resolution x-ray diffraction, and magnetic field-dependent neutron diffraction measurements reveal a novel magnetic ground state of Ba0.60K0.40Mn2As2 in which itinerant ferromagnetism (FM) below a Curie temperature TC≈100 K arising from the doped conduction holes coexists with collinear antiferromagnetism (AFM) of the Mn local moments that order below a Néel temperature TN=480 K. The FM ordered moments are aligned in the tetragonal ab plane and are orthogonal to the AFM ordered Mn moments that are aligned along the c axis. The magnitude and nature of the low-T FM ordered moment correspond to complete polarization of the doped-hole spins (half-metallic itinerant FM) as deduced from magnetization and ab-plane electrical resistivity measurements.
Collapse
Affiliation(s)
- Abhishek Pandey
- Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
11
|
New diluted ferromagnetic semiconductor with Curie temperature up to 180 K and isostructural to the '122' iron-based superconductors. Nat Commun 2013; 4:1442. [PMID: 23385587 DOI: 10.1038/ncomms2447] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2012] [Accepted: 01/04/2013] [Indexed: 11/08/2022] Open
Abstract
Diluted magnetic semiconductors have received much attention due to their potential applications for spintronics devices. A prototypical system (Ga,Mn)As has been widely studied since the 1990s. The simultaneous spin and charge doping via hetero-valent (Ga(3+),Mn(2+)) substitution, however, resulted in severely limited solubility without availability of bulk specimens. Here we report the synthesis of a new diluted magnetic semiconductor (Ba(1-x)K(x))(Zn(1-y)Mn(y))(2)As(2), which is isostructural to the 122 iron-based superconductors with the tetragonal ThCr(2)Si(2) (122) structure. Holes are doped via (Ba(2+), K(1+)) replacements, while spins via isovalent (Zn(2+),Mn(2+)) substitutions. Bulk samples with x=0.1-0.3 and y=0.05-0.15 exhibit ferromagnetic order with T(C) up to 180 K, which is comparable to the highest T(C) for (Ga,Mn)As and significantly enhanced from T(C) up to 50 K of the '111'-based Li(Zn,Mn)As. Moreover, ferromagnetic (Ba,K)(Zn,Mn)(2)As(2) shares the same 122 crystal structure with semiconducting BaZn(2)As(2), antiferromagnetic BaMn(2)As(2) and superconducting (Ba,K)Fe(2)As(2), which makes them promising for the development of multilayer functional devices.
Collapse
|
12
|
Fernandes RM, Millis AJ. Suppression of superconductivity by Néel-type magnetic fluctuations in the iron pnictides. PHYSICAL REVIEW LETTERS 2013; 110:117004. [PMID: 25166566 DOI: 10.1103/physrevlett.110.117004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2012] [Revised: 11/08/2012] [Indexed: 06/03/2023]
Abstract
Motivated by the recent experimental detection of Néel-type [(π, π)] magnetic fluctuations in some iron pnictides, we study the impact of competing (π, π) and (π, 0) spin fluctuations on the superconductivity of these materials. We show that, counterintuitively, even short-range, weak Néel fluctuations strongly suppress the s(+-) state, with the main effect arising from a repulsive contribution to the s(+-) pairing interaction, complemented by low-frequency inelastic scattering. Further increasing the strength of the Néel fluctuations leads to a low-T(c) d-wave state, with a possible intermediate s+id phase. The results suggest that the absence of superconductivity in a series of hole-doped pnictides is due to the combination of short-range Néel fluctuations and pair-breaking impurity scattering and also that T(c) of optimally doped pnictides could be further increased if residual (π, π) fluctuations were reduced.
Collapse
Affiliation(s)
- Rafael M Fernandes
- Department of Physics, Columbia University, New York, New York 10027, USA and Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Andrew J Millis
- Department of Physics, Columbia University, New York, New York 10027, USA
| |
Collapse
|
13
|
Guo J, Simonson JW, Sun L, Wu Q, Gao P, Zhang C, Gu D, Kotliar G, Aronson M, Zhao Z. Observation of antiferromagnetic order collapse in the pressurized insulator LaMnPO. Sci Rep 2013; 3:2555. [PMID: 23989921 PMCID: PMC3757459 DOI: 10.1038/srep02555] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2013] [Accepted: 08/15/2013] [Indexed: 12/03/2022] Open
Abstract
The emergence of superconductivity in the iron pnictide or cuprate high temperature superconductors usually accompanies the suppression of a long-ranged antiferromagnetic (AFM) order state in a corresponding parent compound by doping or pressurizing. A great deal of effort by doping has been made to find superconductivity in Mn-based compounds, which are thought to bridge the gap between the two families of high temperature superconductors, but the AFM order was not successfully suppressed. Here we report the first observations of the pressure-induced elimination of long-ranged AFM order at ~ 34 GPa and a crossover from an AFM insulating to an AFM metallic state at ~ 20 GPa in LaMnPO single crystals that are iso-structural to the LaFeAsO superconductor by in-situ high pressure resistance and ac susceptibility measurements. These findings are of importance to explore potential superconductivity in Mn-based compounds and to shed new light on the underlying mechanism of high temperature superconductivity.
Collapse
Affiliation(s)
- Jing Guo
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - J. W. Simonson
- Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794, USA
| | - Liling Sun
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Qi Wu
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Peiwen Gao
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Chao Zhang
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Dachun Gu
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Gabriel Kotliar
- Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA
| | - Meigan Aronson
- Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794, USA
| | - Zhongxian Zhao
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| |
Collapse
|
14
|
From antiferromagnetic insulator to correlated metal in pressurized and doped LaMnPO. Proc Natl Acad Sci U S A 2012; 109:E1815-9. [PMID: 22647607 DOI: 10.1073/pnas.1117366109] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Widespread adoption of superconducting technologies awaits the discovery of new materials with enhanced properties, especially higher superconducting transition temperatures T(c). The unexpected discovery of high T(c) superconductivity in cuprates suggests that the highest T(c)s occur when pressure or doping transform the localized and moment-bearing electrons in antiferromagnetic insulators into itinerant carriers in a metal, where magnetism is preserved in the form of strong correlations. The absence of this transition in Fe-based superconductors may limit their T(c)s, but even larger T(c)s may be possible in their isostructural Mn analogs, which are antiferromagnetic insulators like the cuprates. It is generally believed that prohibitively large pressures would be required to suppress the effects of the strong Hund's rule coupling in these Mn-based compounds, collapsing the insulating gap and enabling superconductivity. Indeed, no Mn-based compounds are known to be superconductors. The electronic structure calculations and X-ray diffraction measurements presented here challenge these long held beliefs, finding that only modest pressures are required to transform LaMnPO, isostructural to superconducting host LaFeAsO, from an antiferromagnetic insulator to a metallic antiferromagnet, where the Mn moment vanishes in a second pressure-driven transition. Proximity to these charge and moment delocalization transitions in LaMnPO results in a highly correlated metallic state, the familiar breeding ground of superconductivity.
Collapse
|