Formation of short-range magnetic order and avoided ferromagnetic quantum criticality in pressurized LaCrGe3

Elena Gati; John M. Wilde; Rustem Khasanov; Li Xiang; Sachith Dissanayake; Ritu Gupta; Masaaki Matsuda; Feng Ye; Bianca Haberl; Udhara Kaluarachchi; Robert J. McQueeney; Andreas Kreyssig; Sergey L. Bud'Ko; Paul C. Canfield

doi:10.1103/PhysRevB.103.075111

Formation of short-range magnetic order and avoided ferromagnetic quantum criticality in pressurized LaCrGe3

Elena Gati, John M. Wilde, Rustem Khasanov, Li Xiang, Sachith Dissanayake, Ritu Gupta, Masaaki Matsuda, Feng Ye, Bianca Haberl, Udhara Kaluarachchi, Robert J. McQueeney, Andreas Kreyssig, Sergey L. Bud'Ko, Paul C. Canfield

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Abstract

LaCrGe3 has attracted attention as a paradigm example of the avoidance of ferromagnetic (FM) quantum criticality in an itinerant magnet. Here, we combined thermodynamic (specific heat and thermal expansion), transport, x-ray, and neutron scattering as well as μSR measurements to obtain insights on the temperature-pressure phase diagram of LaCrGe3. Consistent with previous studies of the phase diagram by transport measurements, our thermodynamic data shows clearly that the FM transition at TFM changes its character from second order to first order when it is suppressed to low temperatures by pressure. In addition, previous studies demonstrated that for high pressures a new phase occurs below T2, which was proposed to be a long-wavelength antiferromagnetic state (AFMq). In this paper, we provide evidence from our thermodynamic data that this phase transition is preceded by yet another phase transition at T1>T2. Our μSR data indicate that full magnetic volume fraction is only established below T2, but that this magnetism is characterized by a short correlation length. Within the experimental resolution, our neutron-scattering data is not able to identify any magnetic Bragg peaks. Overall, the microscopic magnetic data is therefore consistent with the formation of FM clusters in the proximity of the avoided FM quantum critical point in LaCrGe3. This conclusion is at odds with the previous proposal of AFMq order and raises questions on the role of disorder in this stochiometric compound.

Original language	English
Article number	075111
Journal	Physical Review B
Volume	103
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevB.103.075111
State	Published - Feb 4 2021

Funding

We thank A.I. Goldman, V. Taufour, and D.H. Ryan for useful discussions and S. Downing and C. Abel for the growth of single crystals. The authors would like to acknowledge B. Li, D. S. Robinson, C. Kenney-Benson, S. Tkachev, M. Baldini, S. G. Sinogeikin, and D. Popov for their assistance during the x-ray diffraction experiments. We thank C. Tulk, A. M. dos Santos, J. Molaison, and R. Boehler for support of the high-pressure neutron-diffraction study and Y. Uwatoko for providing us the palm cubic pressure cell. Work at the Ames Laboratory was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. The Ames Laboratory is operated for the U.S. Department of Energy by Iowa State University under Contract No. DEAC02-07CH11358. E.G. and L.X. were funded, in part, by the Gordon and Betty Moore Foundation's EPiQS Initiative through Grant No. GBMF4411. In addition, L.X. was funded, in part, by the W. M. Keck Foundation. A portion of this research used resources at the High Flux Isotope Reactor and the Spallation Neutron Source, U.S. DOE Office of Science User Facilities operated by the Oak Ridge National Laboratory. This research used resources of the Advanced Photon Source, a U.S. DOE Office of Science User Facility operated for the US DOE Office of Science by Argonne National Laboratory under Contract No. DE-ac02-06CH11357. We gratefully acknowledge support by HPCAT (Sector 16), Advanced Photon Source (APS), Argonne National Laboratory. HPCAT operations are supported by DOE-NNSA under Grant No. DE-NA0001974, with partial instrumentation funding by NSF. Use of the COMPRES-GSECARS gas loading system was supported by COMPRES under NSF Cooperative Agreement Grant No. EAR-11-57758 and by GSECARS through NSF Grant No. EAR-1128799 and DOE Grant No. DE-FG02-94ER14466. Research of R.G. is supported by the Swiss National Science Foundation (SNF-Grant No. 200021-175935).

Funders	Funder number
COMPRES	EAR-11-57758
DOE-NNSA	DE-NA0001974
GSECARS	EAR-1128799
HPCAT
National Science Foundation
U.S. Department of Energy	DE-FG02-94ER14466
Directorate for Geosciences	1128799
W. M. Keck Foundation
Gordon and Betty Moore Foundation	GBMF4411
Office of Science
Basic Energy Sciences
Argonne National Laboratory	DE-ac02-06CH11357
Iowa State University	DEAC02-07CH11358
Ames Laboratory
Division of Materials Sciences and Engineering
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung	200021-175935

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10.1103/PhysRevB.103.075111

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Gati, E., Wilde, J. M., Khasanov, R., Xiang, L., Dissanayake, S., Gupta, R., Matsuda, M., Ye, F., Haberl, B., Kaluarachchi, U., McQueeney, R. J., Kreyssig, A., Bud'Ko, S. L., & Canfield, P. C. (2021). Formation of short-range magnetic order and avoided ferromagnetic quantum criticality in pressurized LaCrGe3. Physical Review B, 103(7), Article 075111. https://doi.org/10.1103/PhysRevB.103.075111

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title = "Formation of short-range magnetic order and avoided ferromagnetic quantum criticality in pressurized LaCrGe3",

abstract = "LaCrGe3 has attracted attention as a paradigm example of the avoidance of ferromagnetic (FM) quantum criticality in an itinerant magnet. Here, we combined thermodynamic (specific heat and thermal expansion), transport, x-ray, and neutron scattering as well as μSR measurements to obtain insights on the temperature-pressure phase diagram of LaCrGe3. Consistent with previous studies of the phase diagram by transport measurements, our thermodynamic data shows clearly that the FM transition at TFM changes its character from second order to first order when it is suppressed to low temperatures by pressure. In addition, previous studies demonstrated that for high pressures a new phase occurs below T2, which was proposed to be a long-wavelength antiferromagnetic state (AFMq). In this paper, we provide evidence from our thermodynamic data that this phase transition is preceded by yet another phase transition at T1>T2. Our μSR data indicate that full magnetic volume fraction is only established below T2, but that this magnetism is characterized by a short correlation length. Within the experimental resolution, our neutron-scattering data is not able to identify any magnetic Bragg peaks. Overall, the microscopic magnetic data is therefore consistent with the formation of FM clusters in the proximity of the avoided FM quantum critical point in LaCrGe3. This conclusion is at odds with the previous proposal of AFMq order and raises questions on the role of disorder in this stochiometric compound.",

author = "Elena Gati and Wilde, {John M.} and Rustem Khasanov and Li Xiang and Sachith Dissanayake and Ritu Gupta and Masaaki Matsuda and Feng Ye and Bianca Haberl and Udhara Kaluarachchi and McQueeney, {Robert J.} and Andreas Kreyssig and Bud'Ko, {Sergey L.} and Canfield, {Paul C.}",

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Gati, E, Wilde, JM, Khasanov, R, Xiang, L, Dissanayake, S, Gupta, R, Matsuda, M , Ye, F , Haberl, B, Kaluarachchi, U, McQueeney, RJ, Kreyssig, A, Bud'Ko, SL & Canfield, PC 2021, 'Formation of short-range magnetic order and avoided ferromagnetic quantum criticality in pressurized LaCrGe3', Physical Review B, vol. 103, no. 7, 075111. https://doi.org/10.1103/PhysRevB.103.075111

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T1 - Formation of short-range magnetic order and avoided ferromagnetic quantum criticality in pressurized LaCrGe3

AU - Gati, Elena

AU - Wilde, John M.

AU - Khasanov, Rustem

AU - Xiang, Li

AU - Dissanayake, Sachith

AU - Gupta, Ritu

AU - Matsuda, Masaaki

AU - Ye, Feng

AU - Haberl, Bianca

AU - Kaluarachchi, Udhara

AU - McQueeney, Robert J.

AU - Kreyssig, Andreas

AU - Bud'Ko, Sergey L.

AU - Canfield, Paul C.

PY - 2021/2/4

Y1 - 2021/2/4

N2 - LaCrGe3 has attracted attention as a paradigm example of the avoidance of ferromagnetic (FM) quantum criticality in an itinerant magnet. Here, we combined thermodynamic (specific heat and thermal expansion), transport, x-ray, and neutron scattering as well as μSR measurements to obtain insights on the temperature-pressure phase diagram of LaCrGe3. Consistent with previous studies of the phase diagram by transport measurements, our thermodynamic data shows clearly that the FM transition at TFM changes its character from second order to first order when it is suppressed to low temperatures by pressure. In addition, previous studies demonstrated that for high pressures a new phase occurs below T2, which was proposed to be a long-wavelength antiferromagnetic state (AFMq). In this paper, we provide evidence from our thermodynamic data that this phase transition is preceded by yet another phase transition at T1>T2. Our μSR data indicate that full magnetic volume fraction is only established below T2, but that this magnetism is characterized by a short correlation length. Within the experimental resolution, our neutron-scattering data is not able to identify any magnetic Bragg peaks. Overall, the microscopic magnetic data is therefore consistent with the formation of FM clusters in the proximity of the avoided FM quantum critical point in LaCrGe3. This conclusion is at odds with the previous proposal of AFMq order and raises questions on the role of disorder in this stochiometric compound.

AB - LaCrGe3 has attracted attention as a paradigm example of the avoidance of ferromagnetic (FM) quantum criticality in an itinerant magnet. Here, we combined thermodynamic (specific heat and thermal expansion), transport, x-ray, and neutron scattering as well as μSR measurements to obtain insights on the temperature-pressure phase diagram of LaCrGe3. Consistent with previous studies of the phase diagram by transport measurements, our thermodynamic data shows clearly that the FM transition at TFM changes its character from second order to first order when it is suppressed to low temperatures by pressure. In addition, previous studies demonstrated that for high pressures a new phase occurs below T2, which was proposed to be a long-wavelength antiferromagnetic state (AFMq). In this paper, we provide evidence from our thermodynamic data that this phase transition is preceded by yet another phase transition at T1>T2. Our μSR data indicate that full magnetic volume fraction is only established below T2, but that this magnetism is characterized by a short correlation length. Within the experimental resolution, our neutron-scattering data is not able to identify any magnetic Bragg peaks. Overall, the microscopic magnetic data is therefore consistent with the formation of FM clusters in the proximity of the avoided FM quantum critical point in LaCrGe3. This conclusion is at odds with the previous proposal of AFMq order and raises questions on the role of disorder in this stochiometric compound.

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JO - Physical Review B

JF - Physical Review B

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ER -

Formation of short-range magnetic order and avoided ferromagnetic quantum criticality in pressurized LaCrGe3

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