Anisotropic superconductivity and magnetism in single-crystal RbEuFe4As4

M. P. Smylie, K. Willa, J. K. Bao, K. Ryan, Z. Islam, H. Claus, Y. Simsek, Z. Diao, A. Rydh, A. E. Koshelev, W. K. Kwok, D. Y. Chung, Mercouri G Kanatzidis, U. Welp

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We investigate the anisotropic superconducting and magnetic properties of single-crystal RbEuFe4As4 using magnetotransport and magnetization measurements. We determine a magnetic ordering temperature of the Eu moments of Tm=15K and a superconducting transition temperature of Tc=36.8K. The superconducting phase diagram is characterized by high upper critical field slopes of -70 and -42 kG/K for in-plane and out-of-plane fields, respectively, and a surprisingly low superconducting anisotropy of Γ=1.7. Ginzburg-Landau parameters of κc∼67 and κab∼108 indicate extreme type-II behavior. These superconducting properties are in line with those commonly seen in optimally doped Fe-based superconductors. In contrast, Eu magnetism is quasi-two dimensional (2D), as evidenced by highly anisotropic in-plane and out-of-plane exchange constants of 0.6 K and <0.04 K. A consequence of the quasi-2D nature of the Eu magnetism are strong magnetic fluctuation effects, a large suppression of the magnetic ordering temperature as compared to the Curie-Weiss temperature, and a kinklike anomaly in the specific heat devoid of any singularity. Magnetization curves reveal a clear magnetic easy-plane anisotropy with in-plane and out-of-plane saturation fields of 2 and 4 kG.

Original languageEnglish
Article number104503
JournalPhysical Review B
Volume98
Issue number10
DOIs
Publication statusPublished - Sep 5 2018

Fingerprint

Magnetism
Superconductivity
Magnetization
superconductivity
Single crystals
single crystals
magnetization
anisotropy
Anisotropy
Galvanomagnetic effects
temperature
Curie temperature
transition temperature
phase diagrams
retarding
specific heat
anomalies
slopes
Superconducting transition temperature
magnetic properties

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Smylie, M. P., Willa, K., Bao, J. K., Ryan, K., Islam, Z., Claus, H., ... Welp, U. (2018). Anisotropic superconductivity and magnetism in single-crystal RbEuFe4As4. Physical Review B, 98(10), [104503]. https://doi.org/10.1103/PhysRevB.98.104503

Anisotropic superconductivity and magnetism in single-crystal RbEuFe4As4. / Smylie, M. P.; Willa, K.; Bao, J. K.; Ryan, K.; Islam, Z.; Claus, H.; Simsek, Y.; Diao, Z.; Rydh, A.; Koshelev, A. E.; Kwok, W. K.; Chung, D. Y.; Kanatzidis, Mercouri G; Welp, U.

In: Physical Review B, Vol. 98, No. 10, 104503, 05.09.2018.

Research output: Contribution to journalArticle

Smylie, MP, Willa, K, Bao, JK, Ryan, K, Islam, Z, Claus, H, Simsek, Y, Diao, Z, Rydh, A, Koshelev, AE, Kwok, WK, Chung, DY, Kanatzidis, MG & Welp, U 2018, 'Anisotropic superconductivity and magnetism in single-crystal RbEuFe4As4', Physical Review B, vol. 98, no. 10, 104503. https://doi.org/10.1103/PhysRevB.98.104503
Smylie MP, Willa K, Bao JK, Ryan K, Islam Z, Claus H et al. Anisotropic superconductivity and magnetism in single-crystal RbEuFe4As4. Physical Review B. 2018 Sep 5;98(10). 104503. https://doi.org/10.1103/PhysRevB.98.104503
Smylie, M. P. ; Willa, K. ; Bao, J. K. ; Ryan, K. ; Islam, Z. ; Claus, H. ; Simsek, Y. ; Diao, Z. ; Rydh, A. ; Koshelev, A. E. ; Kwok, W. K. ; Chung, D. Y. ; Kanatzidis, Mercouri G ; Welp, U. / Anisotropic superconductivity and magnetism in single-crystal RbEuFe4As4. In: Physical Review B. 2018 ; Vol. 98, No. 10.
@article{6971a580dcc24bb0a1103d18c8d0621a,
title = "Anisotropic superconductivity and magnetism in single-crystal RbEuFe4As4",
abstract = "We investigate the anisotropic superconducting and magnetic properties of single-crystal RbEuFe4As4 using magnetotransport and magnetization measurements. We determine a magnetic ordering temperature of the Eu moments of Tm=15K and a superconducting transition temperature of Tc=36.8K. The superconducting phase diagram is characterized by high upper critical field slopes of -70 and -42 kG/K for in-plane and out-of-plane fields, respectively, and a surprisingly low superconducting anisotropy of Γ=1.7. Ginzburg-Landau parameters of κc∼67 and κab∼108 indicate extreme type-II behavior. These superconducting properties are in line with those commonly seen in optimally doped Fe-based superconductors. In contrast, Eu magnetism is quasi-two dimensional (2D), as evidenced by highly anisotropic in-plane and out-of-plane exchange constants of 0.6 K and <0.04 K. A consequence of the quasi-2D nature of the Eu magnetism are strong magnetic fluctuation effects, a large suppression of the magnetic ordering temperature as compared to the Curie-Weiss temperature, and a kinklike anomaly in the specific heat devoid of any singularity. Magnetization curves reveal a clear magnetic easy-plane anisotropy with in-plane and out-of-plane saturation fields of 2 and 4 kG.",
author = "Smylie, {M. P.} and K. Willa and Bao, {J. K.} and K. Ryan and Z. Islam and H. Claus and Y. Simsek and Z. Diao and A. Rydh and Koshelev, {A. E.} and Kwok, {W. K.} and Chung, {D. Y.} and Kanatzidis, {Mercouri G} and U. Welp",
year = "2018",
month = "9",
day = "5",
doi = "10.1103/PhysRevB.98.104503",
language = "English",
volume = "98",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Physical Society",
number = "10",

}

TY - JOUR

T1 - Anisotropic superconductivity and magnetism in single-crystal RbEuFe4As4

AU - Smylie, M. P.

AU - Willa, K.

AU - Bao, J. K.

AU - Ryan, K.

AU - Islam, Z.

AU - Claus, H.

AU - Simsek, Y.

AU - Diao, Z.

AU - Rydh, A.

AU - Koshelev, A. E.

AU - Kwok, W. K.

AU - Chung, D. Y.

AU - Kanatzidis, Mercouri G

AU - Welp, U.

PY - 2018/9/5

Y1 - 2018/9/5

N2 - We investigate the anisotropic superconducting and magnetic properties of single-crystal RbEuFe4As4 using magnetotransport and magnetization measurements. We determine a magnetic ordering temperature of the Eu moments of Tm=15K and a superconducting transition temperature of Tc=36.8K. The superconducting phase diagram is characterized by high upper critical field slopes of -70 and -42 kG/K for in-plane and out-of-plane fields, respectively, and a surprisingly low superconducting anisotropy of Γ=1.7. Ginzburg-Landau parameters of κc∼67 and κab∼108 indicate extreme type-II behavior. These superconducting properties are in line with those commonly seen in optimally doped Fe-based superconductors. In contrast, Eu magnetism is quasi-two dimensional (2D), as evidenced by highly anisotropic in-plane and out-of-plane exchange constants of 0.6 K and <0.04 K. A consequence of the quasi-2D nature of the Eu magnetism are strong magnetic fluctuation effects, a large suppression of the magnetic ordering temperature as compared to the Curie-Weiss temperature, and a kinklike anomaly in the specific heat devoid of any singularity. Magnetization curves reveal a clear magnetic easy-plane anisotropy with in-plane and out-of-plane saturation fields of 2 and 4 kG.

AB - We investigate the anisotropic superconducting and magnetic properties of single-crystal RbEuFe4As4 using magnetotransport and magnetization measurements. We determine a magnetic ordering temperature of the Eu moments of Tm=15K and a superconducting transition temperature of Tc=36.8K. The superconducting phase diagram is characterized by high upper critical field slopes of -70 and -42 kG/K for in-plane and out-of-plane fields, respectively, and a surprisingly low superconducting anisotropy of Γ=1.7. Ginzburg-Landau parameters of κc∼67 and κab∼108 indicate extreme type-II behavior. These superconducting properties are in line with those commonly seen in optimally doped Fe-based superconductors. In contrast, Eu magnetism is quasi-two dimensional (2D), as evidenced by highly anisotropic in-plane and out-of-plane exchange constants of 0.6 K and <0.04 K. A consequence of the quasi-2D nature of the Eu magnetism are strong magnetic fluctuation effects, a large suppression of the magnetic ordering temperature as compared to the Curie-Weiss temperature, and a kinklike anomaly in the specific heat devoid of any singularity. Magnetization curves reveal a clear magnetic easy-plane anisotropy with in-plane and out-of-plane saturation fields of 2 and 4 kG.

UR - http://www.scopus.com/inward/record.url?scp=85053136770&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85053136770&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.98.104503

DO - 10.1103/PhysRevB.98.104503

M3 - Article

VL - 98

JO - Physical Review B

JF - Physical Review B

SN - 2469-9950

IS - 10

M1 - 104503

ER -