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Title: Normal State O 17 NMR Studies of Sr 2 RuO 4 under Uniaxial Stress

Abstract

The effects of uniaxial compressive stress on the normal state 17O nuclear-magnetic-resonance properties of the unconventional superconductor Sr 2RuO 4 are reported. The paramagnetic shifts of both planar and apical oxygen sites show pronounced anomalies near the nominal a-axis strain ε aa ≡ ε v that maximizes the superconducting transition temperature T c. The spin susceptibility weakly increases on lowering the temperature below T ≃ 10 K, consistent with an enhanced density of states associated with passing the Fermi energy through a van Hove singularity. Although such a Lifshitz transition occurs in the γ band formed by the Ru d xy states hybridized with in-plane O p π orbitals, the large Hund’s coupling renormalizes the uniform spin susceptibility, which, in turn, affects the hyperfine fields of all nuclei. We estimate this “Stoner” renormalization S by combining the data with first-principles calculations and conclude that this is an important part of the strain effect, with implications for superconductivity.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1523695
Alternate Identifier(s):
OSTI ID: 1558056
Report Number(s):
LA-UR-18-30163
Journal ID: ISSN 2160-3308; PRXHAE; 021044
Grant/Contract Number:  
20170204ER; 89233218CNA000001
Resource Type:
Published Article
Journal Name:
Physical Review X
Additional Journal Information:
Journal Name: Physical Review X Journal Volume: 9 Journal Issue: 2; Journal ID: ISSN 2160-3308
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Luo, Yongkang, Pustogow, A., Guzman, P., Dioguardi, A. P., Thomas, S. M., Ronning, F., Kikugawa, N., Sokolov, D. A., Jerzembeck, F., Mackenzie, A. P., Hicks, C. W., Bauer, E. D., Mazin, I. I., and Brown, S. E. Normal State O 17 NMR Studies of Sr 2 RuO 4 under Uniaxial Stress. United States: N. p., 2019. Web. doi:10.1103/PhysRevX.9.021044.
Luo, Yongkang, Pustogow, A., Guzman, P., Dioguardi, A. P., Thomas, S. M., Ronning, F., Kikugawa, N., Sokolov, D. A., Jerzembeck, F., Mackenzie, A. P., Hicks, C. W., Bauer, E. D., Mazin, I. I., & Brown, S. E. Normal State O 17 NMR Studies of Sr 2 RuO 4 under Uniaxial Stress. United States. doi:10.1103/PhysRevX.9.021044.
Luo, Yongkang, Pustogow, A., Guzman, P., Dioguardi, A. P., Thomas, S. M., Ronning, F., Kikugawa, N., Sokolov, D. A., Jerzembeck, F., Mackenzie, A. P., Hicks, C. W., Bauer, E. D., Mazin, I. I., and Brown, S. E. Fri . "Normal State O 17 NMR Studies of Sr 2 RuO 4 under Uniaxial Stress". United States. doi:10.1103/PhysRevX.9.021044.
@article{osti_1523695,
title = {Normal State O 17 NMR Studies of Sr 2 RuO 4 under Uniaxial Stress},
author = {Luo, Yongkang and Pustogow, A. and Guzman, P. and Dioguardi, A. P. and Thomas, S. M. and Ronning, F. and Kikugawa, N. and Sokolov, D. A. and Jerzembeck, F. and Mackenzie, A. P. and Hicks, C. W. and Bauer, E. D. and Mazin, I. I. and Brown, S. E.},
abstractNote = {The effects of uniaxial compressive stress on the normal state 17O nuclear-magnetic-resonance properties of the unconventional superconductor Sr2RuO4 are reported. The paramagnetic shifts of both planar and apical oxygen sites show pronounced anomalies near the nominal a-axis strain εaa ≡ εv that maximizes the superconducting transition temperature Tc. The spin susceptibility weakly increases on lowering the temperature below T ≃ 10 K, consistent with an enhanced density of states associated with passing the Fermi energy through a van Hove singularity. Although such a Lifshitz transition occurs in the γ band formed by the Ru dxy states hybridized with in-plane O pπ orbitals, the large Hund’s coupling renormalizes the uniform spin susceptibility, which, in turn, affects the hyperfine fields of all nuclei. We estimate this “Stoner” renormalization S by combining the data with first-principles calculations and conclude that this is an important part of the strain effect, with implications for superconductivity.},
doi = {10.1103/PhysRevX.9.021044},
journal = {Physical Review X},
number = 2,
volume = 9,
place = {United States},
year = {2019},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevX.9.021044

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Cited by: 5 works
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