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

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.

doi:10.1103/PhysRevX.9.021044

Title: Normal State ${}^{17}O$ 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 Sr₂RuO₄ 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:: 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.

Publication Date:: Fri May 31 00:00:00 EDT 2019

Research Org.:: Los Alamos National Laboratory (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.

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                    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.  https://doi.org/10.1103/PhysRevX.9.021044

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                    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.  https://doi.org/10.1103/PhysRevX.9.021044.

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@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         = {Fri May 31 00:00:00 EDT 2019},

  month        = {Fri May 31 00:00:00 EDT 2019}

}

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

Abstract

Citation Formats

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Title: Normal State ${}^{17}O$ NMR Studies of ${Sr}_{2} {RuO}_{4}$ under Uniaxial Stress

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journal, March 2017

The superconductivity of ${Sr}_{2} {RuO}_{4}$ and the physics of spin-triplet pairing
journal, May 2003

Upper limit on spontaneous supercurrents in ${Sr}_{2} Ru O_{4}$
journal, July 2007

Searching for Gap Zeros in Sr ₂ RuO ₄ via Field-Angle-Dependent Specific-Heat Measurement
journal, September 2018

Resistivity in the Vicinity of a van Hove Singularity: ${Sr}_{2} {RuO}_{4}$ under Uniaxial Pressure
journal, February 2018

Novel Character of Spin Fluctuations in Spin-Triplet Superconductor Sr ₂ RuO ₄ : ¹⁷ O-NMR Study
journal, November 1998

Effect of impurities on the transport properties in the Van Hove scenario
journal, May 1996