Two-stage evolution of magnetic correlations in the spiral spin liquid material Ca10Cr7O28

Changhyun Koo; Jaena Park; Johannes Werner; Suheon Lee; Christian Balz; A. T.M.Nazmul Islam; Yugo Oshima; Bella Lake; Kwang Yong Choi; Rüdiger Klingeler

doi:10.1103/PhysRevB.111.125144

Two-stage evolution of magnetic correlations in the spiral spin liquid material Ca10Cr7O28

Changhyun Koo
, Jaena Park
, Johannes Werner
, Suheon Lee
, Christian Balz
, A. T.M.Nazmul Islam
, Yugo Oshima
, Bella Lake
, Kwang Yong Choi
, Rüdiger Klingeler

Direct Geometry

Research output: Contribution to journal › Article › peer-review

Abstract

We present an X-band and tunable high-frequency/high-field electron spin resonance (HF-ESR) study of single-crystalline Ca10Cr7O28, which constitutes alternating antiferromagnetic and ferromagnetic kagome bilayers. At high temperatures, a phonon-assisted relaxation process is evoked to account for the pronounced increase of the linewidth in an exchange-narrowing regime (kBT≫J). In contrast, at low temperatures (kBTJ), a power-law behavior in line narrowing is observed. Our data reveal two distinct power-law regimes for the linewidth which crossover at T∗≈7.5K. Notably, the intriguing evolution of the ESR linewidth in this alternating kagome bilayer system with opposite sign of exchange interactions highlights distinct spin dynamics compared to those in a uniform kagome antiferromagnet.

Original language	English
Article number	125144
Journal	Physical Review B
Volume	111
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevB.111.125144
State	Published - Mar 15 2025

Funding

This work was supported by Deutsche Forschungsgemeinschaft (DFG) under Germany's Excellence Strategy EXC2181/1-390900948 (the Heidelberg STRUCTURES Excellence Cluster) and by Korea NRF Grant (No. 2020R1A2C3012367). Partial support by the DFG within project B06 of the SFB 1143 (Project No. 247310070) and by BMBF via the SpinFun project (13XP5088) is gratefully acknowledged. C.K. acknowledges support from the DFG (Project No. 415157846). S.L. acknowledges support from the Institute for Basic Science (IBS-R014-Y2).

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10.1103/PhysRevB.111.125144

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title = "Two-stage evolution of magnetic correlations in the spiral spin liquid material Ca10Cr7O28",

abstract = "We present an X-band and tunable high-frequency/high-field electron spin resonance (HF-ESR) study of single-crystalline Ca10Cr7O28, which constitutes alternating antiferromagnetic and ferromagnetic kagome bilayers. At high temperatures, a phonon-assisted relaxation process is evoked to account for the pronounced increase of the linewidth in an exchange-narrowing regime (kBT≫J). In contrast, at low temperatures (kBTJ), a power-law behavior in line narrowing is observed. Our data reveal two distinct power-law regimes for the linewidth which crossover at T∗≈7.5K. Notably, the intriguing evolution of the ESR linewidth in this alternating kagome bilayer system with opposite sign of exchange interactions highlights distinct spin dynamics compared to those in a uniform kagome antiferromagnet.",

author = "Changhyun Koo and Jaena Park and Johannes Werner and Suheon Lee and Christian Balz and Islam, \{A. T.M.Nazmul\} and Yugo Oshima and Bella Lake and Choi, \{Kwang Yong\} and R{\"u}diger Klingeler",

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AU - Koo, Changhyun

AU - Park, Jaena

AU - Werner, Johannes

AU - Lee, Suheon

AU - Balz, Christian

AU - Islam, A. T.M.Nazmul

AU - Oshima, Yugo

AU - Lake, Bella

AU - Choi, Kwang Yong

AU - Klingeler, Rüdiger

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N2 - We present an X-band and tunable high-frequency/high-field electron spin resonance (HF-ESR) study of single-crystalline Ca10Cr7O28, which constitutes alternating antiferromagnetic and ferromagnetic kagome bilayers. At high temperatures, a phonon-assisted relaxation process is evoked to account for the pronounced increase of the linewidth in an exchange-narrowing regime (kBT≫J). In contrast, at low temperatures (kBTJ), a power-law behavior in line narrowing is observed. Our data reveal two distinct power-law regimes for the linewidth which crossover at T∗≈7.5K. Notably, the intriguing evolution of the ESR linewidth in this alternating kagome bilayer system with opposite sign of exchange interactions highlights distinct spin dynamics compared to those in a uniform kagome antiferromagnet.

AB - We present an X-band and tunable high-frequency/high-field electron spin resonance (HF-ESR) study of single-crystalline Ca10Cr7O28, which constitutes alternating antiferromagnetic and ferromagnetic kagome bilayers. At high temperatures, a phonon-assisted relaxation process is evoked to account for the pronounced increase of the linewidth in an exchange-narrowing regime (kBT≫J). In contrast, at low temperatures (kBTJ), a power-law behavior in line narrowing is observed. Our data reveal two distinct power-law regimes for the linewidth which crossover at T∗≈7.5K. Notably, the intriguing evolution of the ESR linewidth in this alternating kagome bilayer system with opposite sign of exchange interactions highlights distinct spin dynamics compared to those in a uniform kagome antiferromagnet.

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Two-stage evolution of magnetic correlations in the spiral spin liquid material Ca10Cr7O28

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