Working Group New Materials, Transport, Thermodynamics and Mesoscopics

Selected Publications

[1]	Calorimetric evidence of nodal gaps in the nematic superconductor FeSe F. Hardy, M. He, L. Wang, Th. Wolf, P. Schweiss, M. Merz, M. Barth, P. Adelmann, R. Eder, A. A. Haghighirad, C. Meingast Phys. Rev. B 99 (2019) 35157
[2]	Competing Electronic Phases near the Onset of Superconductivity in Hole-doped SrFe₂As₂ L. Wang, M. He, D. D. Scherer, F. Hardy, P. Schweiss, T. Wolf, M. Merz, B. M. Andersen, C. Meingast J. Phys. Soc. Jpn. 88 (2019) 104710
[3]	Spectral Evidence for Emergent Order in Ba_1−xNa_xFe₂As₂ M. Yi, A. Frano, D. H. Lu, Y. He, M. Wang, B. Frandsen, A. F. Kemper, Y. Rong, Q. Si, L. Wang, M. He, F. Hardy, P. Schweiss, P. Adelmann, Th. Wolf, M. Hashimoto, S.-K. Mo, Z. Hussain, M. Le Tacon, C. S. Nelson, A. E. Böhmer, D.-H. Lee, Z.-X. Shen, C. Meingast, R. J. Birgeneau Phys. Rev. Lett. 121 (2018) 127001
[4]	Dichotomy between in-plane magnetic susceptibility and resistivity anisotropies in extremely strained BaFe₂As₂ M. He, L. Wang, F. Ahn, F. Hardy, Th. Wolf, P. Adelmann, J. Schmalian, I. Eremin, C. Meingast Nat. Commun. 8 (2017) 504
[5]	Nematic susceptibility of hole- and electron-doped BaFe₂As₂ iron-based superconductors A. E. Böhmer, P. Burger, F. Hardy, T. Wolf, P. Schweiss, R. Fromknecht, M. Reinecker, W. Schranz, C. Meingast Phys. Rev. Lett. 112 (2014) 47001
[6]	Scaling between magnetic and lattice fluctuations in iron-pnictide superconductors R. M. Fernandes, A. E. B Phys. Rev. Lett. 111 (2013) 137001
[7]	Novel electronic nematicity in heavily hole-doped iron pnictide superconductors K. Ishida, M. Tsujii, S. Hosoi, Y. Mizukami, S. Ishida, A. Iyo, H. Eisaki, T. Wolf, K. Grube, H. L PNAS 117 (2020) 6424
[8]	High-field moment polarization in the itinerant ferromagnet URhSi W. Knafo, T. D. Matsuda, F. Hardy, D. Aoki, J. Flouquet Phys. Rev. B 100 (2019) 94421
[9]	Quantum Critical Point in the Itinerant Ferromagnet Ni_1?xRh_x C.-L. Huang, A. M. Hallas, K. Grube, S. Kuntz, B. Spie Phys. Rev. Lett. 124 (2020) 117203
[10]	Magnetic and structural quantum phase transitions in CeCu_6−xAu_x are independent K. Grube, L. Pintschovius, F. Weber, J.-P. Castellan, S. Zaum, S. Kuntz, P. Schweiss, O. Stockert, S. Bachus, Y. Shimura, V. Fritsch, H. v. Loehneysen Phys. Rev. Lett. 121 (2018) 87203
[11]	Raman scattering study of lattice and magnetic excitations in CrAs K. Sen, Y. Yao, R. Heid, A. Omoumi, F. Hardy, K. Willa, M. Merz, A. A. Haghighirad, M. Le Tacon Phys. Rev. B 100 (2019) 104301
[12]	Josephson vortex coupled to a flux qubit K. G. Fedorov, A. V. Shcherbakova, R. Sch Appl. Phys. Lett. 102 (2013) 132602
[13]	Thermally activated conductance in arrays of small Josephson junctions J. Zimmer, N. Vogt, A. Fiebig, S. V. Syzranov, A. Lukashenko, R. Sch Phys. Rev. B 88 (2013) 144506
[14]	Aluminum Hard Mask Technique for the Fabrication of High Quality Submicron Nb/Al-AlO_x/Nb Josephson Junctions Ch. Kaiser, J. M. Meckbach, K. S. Ilin, J. Lisenfeld, R. Sch Supercond. Sci. Technol. 24 (2011) 35005
[15]	Suppression of superconductivity and enhanced critical field anisotropy in thin flakes of FeSe L. Farrar, M. Bristow, A. A. Haghighirad, A. McCollam, S. J. Bending, A. I. Coldea npj Quantum Mater. 5 (2020) 29
[16]	Quenched nematic criticality separating two superconducting domes in an iron-based superconductor under pressure P. Reiss, D. Graf, A. A. Haghighirad, W. Knafo, L. Drigo, M. Bristow, A. J. Schofield, A. I. Coldea Nat. Phys. (2019) 41567
[17]	Perovskite Solar Cells: Record Open-Circuit Voltage Wide-Bandgap Perovskite Solar Cells Utilizing 2D/3D Perovskite Heterostructure S. Gharibzadeh, B. Abdollahi Nejand, M. Jakoby, T. Abzieher, D. Hauschild, S. Moghadamzadeh, J. A. Schwenzer, P. Brenner, R. Schmager, A. A. Haghighirad, L. Weinhardt, U. Lemmer, B. S. Richards, I. A. Howard, U. W. Paetzold Adv. Energy Mater. 9 (2019) 1970079
[18]	Band hybridisation at the semimetal-semiconductor transition of Ta₂NiSe₅ enabled by mirror-symmetry breaking M. D. Watson, I. Markovic, E. A. Morales, P. Le Fevre, M. Merz, A. A. Haghighirad, P. D. C. King Phys. Rev. Research 2 (2020) 13236
[19]	Flux Separation Methods for Flux-Grown Single Crystals Th. Wolf Philos. Mag. 92 (2012) 2458

Recent Publications

Using strain to uncover the interplay between two- and three-dimensional charge density waves in high-temperature superconducting YBa $_{2}$ Cu $_{3}$ O $_{y}$
Vinograd, I.; Souliou, S. M.; Haghighirad, A.-A.; Lacmann, T.; Caplan, Y.; Frachet, M.; Merz, M.; Garbarino, G.; Liu, Y.; Nakata, S.; Ishida, K.; Noad, H. M. L.; Minola, M.; Keimer, B.; Orgad, D.; Hicks, C. W.; Le Tacon, M.
2024. Nature Communications, 15 (1), Art.-Nr.: 3277. doi:10.1038/s41467-024-47540-w

High-pressure phase diagram of BaNi₂ As₂: Unconventional charge density waves and structural phase transitions
Lacmann, T.; Haghighirad, A.-A.; Souliou, S.-M.; Merz, M.; Garbarino, G.; Glazyrin, K.; Heid, R.; Le Tacon, M.
2023. Physical Review B, 108 (22), Art.-Nr.: 224115. doi:10.1103/PhysRevB.108.224115

Resurgence of superconductivity and the role of dxy hole band in FeSe $_{1 - x}$ Te $_{x}$
Morfoot, A. B.; Kim, T. K.; Watson, M. D.; Haghighirad, A. A.; Singh, S. J.; Bultinck, N.; Coldea, A. I.
2023. Communications Physics, 6 (1), Art.-Nr.: 362. doi:10.1038/s42005-023-01481-w

Precursor region with full phonon softening above the charge-density-wave phase transition in 2H-TaSe2
Shen, X.; Heid, R.; Hott, R.; Haghighirad, A.-A.; Salzmann, B.; dos Reis Cantarino, M.; Monney, C.; Said, A. H.; Frachet, M.; Murphy, B.; Rossnagel, K.; Rosenkranz, S.; Weber, F.
2023. Nature Communications, 14 (1), 7282. doi:10.1038/s41467-023-43094-5

Multiband description of the upper critical field of bulk FeSe
Bristow, M.; Gower, A.; Prentice, J. C. A.; Watson, M. D.; Zajicek, Z.; Blundell, S. J.; Haghighirad, A. A.; McCollam, A.; Coldea, A. I.
2023. Physical Review B, 108 (18), Art.-Nr.: 184507. doi:10.1103/PhysRevB.108.184507

Interplay of stripe and double- Q magnetism with superconductivity in Ba₁₋ₓKₓFe₂As₂ under the influence of magnetic fields
Willa, K.; Willa, R.; Hardy, F.; Wang, L.; Schweiss, P.; Wolf, T.; Meingast, C.
2023. Physical Review B, 108 (5), 054504. doi:10.1103/PhysRevB.108.054504

High-sensitivity specific heat study of the low-temperature–high-field corner of the $H - T$ phase diagram of FeSe
Klein, T.; Demuer, A.; Seyfarth, G.; Cercellier, H.; Doussoulin, L.; Toulemonde, P.; Haghighirad A.A.; Hardy, F.; Marcenat, C.
2023. Physical Review B, 107 (22), Art.-Nr.: 224506. doi:10.1103/PhysRevB.107.224506

Disentangling Lattice and Electronic Instabilities in the Excitonic Insulator Candidate Ta 2 NiSe 5 by Nonequilibrium Spectroscopy
Katsumi, K.; Alekhin, A.; Souliou, S.-M.; Merz, M.; Haghighirad, A.-A.; Le Tacon, M.; Houver, S.; Cazayous, M.; Sacuto, A.; Gallais, Y.
2023. Physical Review Letters, 130 (10), 106904. doi:10.1103/PhysRevLett.130.106904

Probing the Local Electronic Structure in Metal Halide Perovskites through Cobalt Substitution
Haghighirad, A. A.; Klug, M. T.; Duffy, L.; Liu, J.; Ardavan, A.; van der Laan, G.; Hesjedal, T.; Snaith, H. J.
2023. Small Methods, 2300095. doi:10.1002/smtd.202300095

Three-dimensional structure of magnetic skyrmions
Brearton, R.; Burn, D. M.; Haghighirad, A. A.; van der Laan, G.; Hesjedal, T.
2022. Physical Review B, 106 (21), Article no: 214404. doi:10.1103/PhysRevB.106.214404

Elastoresistivity in the incommensurate charge density wave phase of BaNi₂(As₁₋ₓPₓ)₂
Frachet, M.; Wiecki, P.; Lacmann, T.; Souliou, S. M.; Willa, K.; Meingast, C.; Merz, M.; Haghighirad, A.-A.; Le Tacon, M.; Böhmer, A. E.
2022. npj Quantum Materials, 7, Article no: 115. doi:10.1038/s41535-022-00525-8

Soft-Phonon and Charge-Density-Wave Formation in Nematic BaNi₂As₂
Souliou, S. M.; Lacmann, T.; Heid, R.; Meingast, C.; Frachet, M.; Paolasini, L.; Haghighirad, A.-A.; Merz, M.; Bosak, A.; Le Tacon, M.
2022. Physical Review Letters, 129 (24), Article no: 247602. doi:10.1103/PhysRevLett.129.247602

Charge density wave transitions, soft phonon, and possible electronic nematicity in BaNi₂(As₁₋ₓPₓ)₂
Meingast, C.; Shukla, A.; Wang, L.; Heid, R.; Hardy, F.; Frachet, M.; Willa, K.; Lacmann, T.; Le Tacon, M.; Merz, M.; Haghighirad, A.-A.; Wolf, T.
2022. Physical Review B, 106 (14), Article no: 144507. doi:10.1103/PhysRevB.106.144507

Unconventional localization of electrons inside of a nematic electronic phase
Farrar, L. S.; Zajicek, Z.; Morfoot, A. B.; Bristow, M.; Humphries, O. S.; Haghighirad, A. A.; McCollam, A.; Bending, S. J.; Coldea, A. I.
2022. Proceedings of the National Academy of Sciences, 119 (43), Art.: e2200405119. doi:10.1073/pnas.2200405119

Influence of the Pd–Si Ratio on the Valence Transition in EuPd $_{2}$ Si $_{2}$ Single Crystals
Kliemt, K.; Peters, M.; Reiser, I.; Ocker, M.; Walther, F.; Tran, D.-M.; Cho, E.; Merz, M.; Haghighirad, A. A.; Hezel, D. C.; Ritter, F.; Krellner, C.
2022. Crystal Growth and Design, 22 (9), 5399–5406. doi:10.1021/acs.cgd.2c00475

An electronic nematic liquid in BaNi $_{2}$ As $_{2}$
Yao, Y.; Willa, R.; Lacmann, T.; Souliou, S.-M.; Frachet, M.; Willa, K.; Merz, M.; Weber, F.; Meingast, C.; Heid, R.; Haghighirad, A.-A.; Schmalian, J.; Le Tacon, M.
2022. Nature Communications, 13 (1), Art.-Nr.: 4535. doi:10.1038/s41467-022-32112-7

Dynamics of collective modes in an unconventional charge density wave system BaNi2As2
Pokharel, A. R.; Grigorev, V.; Mejas, A.; Dong, T.; Haghighirad, A. A.; Heid, R.; Yao, Y.; Merz, M.; Le Tacon, M.; Demsar, J.
2022. Communications Physics, 5 (1), Artkl.Nr.: 141. doi:10.1038/s42005-022-00919-x

Magnetic domain walls of the van der Waals material Fe3GeTe2
Yang, H.-H.; Bansal, N.; Rüßmann, P.; Hoﬀmann, M.; Zhang, L.; Go, D.; Li, Q.; Haghighirad, A.; Sen, K.; Bluegel, S.; Le Tacon, M.; Mokrousov, Y.; Wulfhekel, W.
2022. 2D Materials, 9 (2), Art.Nr. 025022. doi:10.1088/2053-1583/ac5d0e

Observation of the non-linear Meissner effect
Wilcox, J. A.; Grant, M. J.; Malone, L.; Putzke, C.; Kaczorowski, D.; Wolf, T.; Hardy, F.; Meingast, C.; Analytis, J. G.; Chu, J.-H.; Fisher, I. R.; Carrington, A.
2022. Nature Communications, 13 (1), 1201. doi:10.1038/s41467-022-28790-y

Signatures of a Quantum Griffiths Phase Close to an Electronic Nematic Quantum Phase Transition
Reiss, P.; Graf, D.; Haghighirad, A. A.; Vojta, T.; Coldea, A. I.
2021. Physical review letters, 127 (24), Article no: 246402. doi:10.1103/PhysRevLett.127.246402

Thermodynamic signatures of short-range magnetic correlations in UTe2
Willa, K.; Hardy, F.; Aoki, D.; Li, D.; Wiecki, P.; Lapertot, G.; Meingast, C.
2021. Physical Review B, 104 (20), Art.Nr. 205107. doi:10.1103/PhysRevB.104.205107

Rotational symmetry breaking at the incommensurate charge-density-wave transition in Ba(Ni,Co)2(As,P)2: Possible nematic phase induced by charge/orbital fluctuations
Merz, M.; Wang, L.; Wolf, T.; Nagel, P.; Meingast, C.; Schuppler, S.
2021. Physical Review B, 104 (18), Art.-Nr.: 184509. doi:10.1103/PhysRevB.104.184509

Superconducting Fluctuations in Overdoped Bi2Sr2CaCu2O8 + δ
He, Y.; Chen, S.-D.; Li, Z.-X.; Zhao, D.; Song, D.; Yoshida, Y.; Eisaki, H.; Wu, T.; Chen, X.-H.; Lu, D.-H.; Meingast, C.; Devereaux, T. P.; Birgeneau, R. J.; Hashimoto, M.; Lee, D.-H.; Shen, Z.-X.
2021. Physical review / X, 11 (3), 031068. doi:10.1103/PhysRevX.11.031068

In $_{2}$ O $_{3}$ :H-Based Hole-Transport-Layer-Free Tin/Lead Perovskite Solar Cells for Efficient Four-Terminal All-Perovskite Tandem Solar Cells
Moghadamzadeh, S.; Hossain, I. M.; Loy, M.; Ritzer, D. B.; Hu, H.; Hauschild, D.; Mertens, A.; Becker, J.-P.; Haghighirad, A. A.; Ahlswede, E.; Weinhardt, L.; Lemmer, U.; Nejand, B. A.; Paetzold, U. W.
2021. ACS applied materials & interfaces, 13 (39), 46488–46498. doi:10.1021/acsami.1c06457

Emerging symmetric strain response and weakening nematic fluctuations in strongly hole- doped iron-based superconductors
Wiecki, P.; Frachet, M.; Haghighirad, A.-A.; Wolf, T.; Meingast, C.; Heid, R.; Böhmer, A. E.
2021. Nature Communications, 12, Art.-Nr.: 4824. doi:10.1038/s41467-021-25121-5

Anomalous anisotropy of the lower critical field and Meissner effect in UTe₂
Paulsen, C.; Knebel, G.; Lapertot, G.; Braithwaite, D.; Pourret, A.; Aoki, D.; Hardy, F.; Flouquet, J.; Brison, J.-P.
2021. Physical Review B, 103 (18), L180501. doi:10.1103/PhysRevB.103.L180501

Strain tuning of nematicity and superconductivity in single crystals of FeSe
Ghini, M.; Bristow, M.; Prentice, J. C. A.; Sutherland, S.; Sanna, S.; Haghighirad, A. A.; Coldea, A. I.
2021. Physical Review B, 103 (20), Art.-Nr.: 205139. doi:10.1103/PhysRevB.103.205139

Linkage between scattering rates and superconductivity in doped ferropnictides
Fink, J.; Rienks, E. D. L.; Yao, M.; Kurleto, R.; Bannies, J.; Aswartham, S.; Morozov, I.; Wurmehl, S.; Wolf, T.; Hardy, F.; Meingast, C.; Jeevan, H. S.; Maiwald, J.; Gegenwart, P.; Felser, C.; Büchner, B.
2021. Physical Review B, 103 (15), Art.:-Nr.: 155119. doi:10.1103/PhysRevB.103.155119

Short-Range Nematic Fluctuations in Sr $_{1}$ - $_{x}$ Na $_{x}$ Fe $_{2}$ As $_{2}$ Superconductors
Wu, S.; Song, Y.; He, Y.; Frano, A.; Yi, M.; Chen, X.; Uchiyama, H.; Alatas, A.; Said, A. H.; Wang, L.; Wolf, T.; Meingast, C.; Birgeneau, R. J.
2021. Physical Review Letters, 126 (10), Art.-Nr.: 107001. doi:10.1103/PhysRevLett.126.107001

Muon spin rotation and infrared spectroscopy study of Ba₁−xNaxFe₂As₂
Sheveleva, E.; Xu, B.; Marsik, P.; Lyzwa, F.; Mallett, B. P. P.; Willa, K.; Meingast, C.; Wolf, T.; Shevtsova, T.; Pashkevich, Y. G.; Bernhard, C.
2020. Physical review / B, 101 (22), Article no: 224515. doi:10.1103/PhysRevB.101.224515

Anisotropic optical properties of detwinned BaFe₂As₂
Homes, C. C.; Wolf, T.; Meingast, C.
2020. Physical review / B, 102 (15), Aritcle no: 155135. doi:10.1103/PhysRevB.102.155135

Dominant In-Plane Symmetric Elastoresistance in CsFe₂As₂
Wiecki, P.; Haghighirad, A.-A.; Weber, F.; Merz, M.; Heid, R.; Böhmer, A. E.
2020. Physical review letters, 125 (18), Article no: 187001. doi:10.1103/PhysRevLett.125.187001

Electronic correlations in the van der Waals ferromagnet Fe₃ GeTe₂ revealed by its charge dynamics
Corasaniti, M.; Yang, R.; Sen, K.; Willa, K.; Merz, M.; Haghighirad, A. A.; Le Tacon, M.; Degiorgi, L.
2020. Physical review / B, 102 (16), Art.-Nr.: 161109. doi:10.1103/PhysRevB.102.161109

Vortex-lattice melting and paramagnetic depairing in the nematic superconductor FeSe
Hardy, F.; Doussoulin, L.; Klein, T.; He, M.; Demuer, A.; Willa, R.; Willa, K.; Haghighirad, A.-A.; Wolf, T.; Merz, M.; Meingast, C.; Marcenat, C.
2020. Physical review research, 2 (3), 033319. doi:10.1103/PhysRevResearch.2.033319

Band engineering of Dirac cones in iron chalcogenides
Lauke, L.; Heid, R.; Merz, M.; Wolf, T.; Haghighirad, A.-A.; Schmalian, J.
2020. Physical review / B, 102 (5), Art.Nr. 054209. doi:10.1103/PhysRevB.102.054209

Electronic Nematicity in URu₂Si₂ Revisited
Wang, L.; He, M.; Hardy, F.; Aoki, D.; Willa, K.; Flouquet, J.; Meingast, C.
2020. Physical review letters, 124 (25), Article: 257601. doi:10.1103/PhysRevLett.124.257601

Revealing the single electron pocket of FeSe in a single orthorhombic domain
Rhodes, L. C.; Watson, M. D.; Haghighirad, A. A.; Evtushinsky, D. V.; Kim, T. K.
2020. Physical review / B, 101 (23), Article no: 235128. doi:10.1103/PhysRevB.101.235128

Suppression of superconductivity and enhanced critical field anisotropy in thin flakes of FeSe
Farrar, L. S.; Bristow, M.; Haghighirad, A. A.; McCollam, A.; Bending, S. J.; Coldea, A. I.
2020. npj quantum materials, 5, Article no: 29. doi:10.1038/s41535-020-0227-3

Anomalous high-magnetic field electronic state of the nematic superconductors FeSe₁₋ₓSₓ
Bristow, M.; Reiss, P.; Haghighirad, A. A.; Zajicek, Z.; Singh, S. J.; Wolf, T.; Graf, D.; Knafo, W.; McCollam, A.; Coldea, A. I.
2020. Physical review research, 2 (1), Art.-Nr.: 013309. doi:10.1103/PhysRevResearch.2.013309

Band hybridization at the semimetal-semiconductor transition of Ta 2NiSe 5 enabled by mirror-symmetry breaking
Watson, M. D.; Marković, I.; Morales, E. A.; Le Fèvre, P.; Merz, M.; Haghighirad, A. A.; King, P. D. C.
2020. Physical review research, 2 (1), Article no: 013236. doi:10.1103/PhysRevResearch.2.013236

Robust Perpendicular Skyrmions and their Surface-Confinement
Zhang, S.; Burn, D. M.; Jaouen, N.; Chauleau, J.-Y.; Haghighirad, A. A.; Liu, Y.; Wang, W.; Laan, G. van der; Hesjedal, T.
2020. Nano letters, 20 (2), 1428–1432. doi:10.1021/acs.nanolett.9b05141

Quenched nematic criticality and two superconducting domes in an iron-based superconductor
Reiss, P.; Graf, D.; Haghighirad, A. A.; Knafo, W.; Drigo, L.; Bristow, M.; Schofield, A. J.; Coldea, A. I.
2020. Nature physics, 16, 89–94. doi:10.1038/s41567-019-0694-2